CN106569378A - Laser speckle elimination light path, double color laser light source and three color laser light source - Google Patents
Laser speckle elimination light path, double color laser light source and three color laser light source Download PDFInfo
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- CN106569378A CN106569378A CN201510643217.9A CN201510643217A CN106569378A CN 106569378 A CN106569378 A CN 106569378A CN 201510643217 A CN201510643217 A CN 201510643217A CN 106569378 A CN106569378 A CN 106569378A
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- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/48—Laser speckle optics
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
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Abstract
The invention discloses a laser speckle elimination light path. Through arranging a conical mirror and a diffusion sheet in a laser output optical path, homogenization shaping is performed on a Gaussian laser beam and a beam portion which causes high laser coherence and is located around a 0 degree optical axis is greatly reduced. And through combining a diffusion effect of the diffusion sheet, a diversity of a laser beam divergence angle is formed. Spatial coherence of the laser is further reduced and a speckle problem during a laser light source application is solved. The light path and the light sources are used for the laser display technology field.
Description
Technical field
The present invention relates to technical field of laser display, more particularly to a kind of laser dissipation speckle light path and double-colored, trichroism LASER Light Source.
Background technology
Laser is a kind of high brightness, and high directivity sends the light source of monochromatic coherent light beam, due to the plurality of advantages of laser, in recent years by gradually as light source applications in projection display technique field.The high coherence of laser brings speckle effect when laser projection shows, so-called speckle refers to coherent source when coarse object is irradiated, light after scattering, due to its wavelength it is identical, phase-constant, interference is produced in space will, in space, some parts interfere mutually long, there is part to interfere cancellation, final result is that occur granular light and dark speckle on screen, these unfocused speckles are in flicker state in human eye, long-time viewing is also easy to produce dizziness sense of discomfort, the deterioration of projected image quality is caused more, reduce the viewing experience of user.
In the LASER Light Source of practical application, LASER Light Source species is more, and speckle effect is also more serious.For the two-color laser light source of red blue laser constitution, human eye is for the sensitivity of red laser speckle effect is higher than for blue laser, therefore the dissipation speckle light path design of red laser light source is just particularly important.
There are various Speckles Techniques that disappear in prior art.A kind of technology is the display screen using vibration, by the vibration of screen weakening integral action of the speckle speckle in human eye, but it is for large scale screen control and impracticable, and project at present also towards developing without screenization direction；A kind of technology is to utilize multimode fibre, makes coherence length of the length between adjacent fiber more than light source, so as to reduce coherence, but the volume of optical fiber is big, light propagation path in a fiber is long, and luminous energy loss is also larger, does not apply to the LASER Light Source design of current miniaturization and highlighted requirement.And, also dissipation speckle is carried out by the diffusion sheet or diffusion sheet of motion are arranged in laser optical path in prior art, but effect is limited.
The content of the invention
The invention provides a kind of laser dissipation speckle light path and two-color laser light source, trichroism LASER Light Source, it is possible to increase the dissipation speckle effect of laser, speckle effect during LASER Light Source application is solved the problems, such as.
The present invention is achieved by the following technical solutions：
Present invention firstly provides a kind of laser dissipation speckle light path, including laser instrument, send laser, and also at least provided with conical mirror, and the diffusion sheet being placed in after conical mirror, laser passes sequentially through conical mirror and diffusion sheet, wherein, conical mirror is homogenized for carrying out Energy distribution to the laser beam, and diffusion sheet is for being diffused to carrying out the laser beam after Energy distribution is homogenized.
Further, the conical mirror is Conical Lenses.
Further, the diffusion sheet does and rotates or translational motion.
Further, the dissipation speckle light path also includes shrink beam part, for laser beam is carried out incident conical mirror after shrink beam.
Further, the dissipation speckle light path also includes collimating components, forms collimated light beam for the light beam dissipated after diffusion is carried out collimation.
Further, the shrink beam part includes the telescopic system being made up of a piece of convex lenss and a piece of concavees lens.
Further, the collimating components include convex lenss or convex lenss microscope group.
Present invention also offers a kind of two-color laser light source, including blue laser and red laser, blue laser and red laser are sent respectively；Fluorescent wheel, is arranged in blue laser emitting light path, and including phosphor region and transmission area, the phosphor region is provided with green emitting phosphor, for being excited generation green fluorescence, transmission area to be used to transmit the blue laser by blue laser,
Wherein, fluorescent wheel is sequentially output blue laser and green fluorescence according to sequential, and closing light part is reached after blue laser and the collimated lens group of green fluorescence；
And, red laser reaches closing light part Jing after dissipation speckle light path, at least provided with conical mirror in the dissipation speckle light path, and the diffusion sheet being placed in after conical mirror, wherein, conical mirror is homogenized for red laser light beam is carried out Energy distribution, and diffusion sheet is for carrying out the red laser light beam after Energy distribution is homogenized and be diffused to described；
Export to light guide member after blue laser, green fluorescence and red laser ECDC light.
Further, conical mirror is Conical Lenses.
Further, diffusion sheet does and rotates or translational motion.
Further, closing light part is dichroic mirror.
Further, dissipation speckle light path also includes shrink beam part, for red laser light beam is carried out incident conical mirror after shrink beam.
Further, dissipation speckle light path also includes collimating components, forms collimated light beam for the red laser dissipated after diffusion light beam is carried out collimation.
Further, export to before light guide member after blue laser, green fluorescence and red laser ECDC light also through assembling part, for reducing the angle of flare of light beam after the closing light.
And, technical solution of the present invention additionally provides a kind of trichroism LASER Light Source, including tri-color laser, sends three kinds of laser of red, green, blue, and above-mentioned three kinds of laser carries out dissipation speckle through the laser dissipation speckle light path of such scheme after closing light.
Technical solution of the present invention, at least with following Advantageous Effects or advantage：
The laser dissipation speckle light path that technical solution of the present invention is provided，By conical mirror is arranged in laser optical path，Using its optical characteristics，The laser beam of gaussian shaped profile can be broken up to form class Bessel type light beam，Shaping is homogenized to the carrying out of laser beam，Be changed into multiple dispersion angles from the Energy distribution mode for concentrating on 0 degree of optical axis and neighbouring dispersion angle and each dispersion angle the relatively homogenized distribution mode of energy，The beam section near 0 degree of optical axis causing laser coherence stronger is reduced significantly，And the diffusion sheet after being arranged on conical mirror，Laser beam after can homogenizing to carrying out Energy distribution is further spread，Such that it is able to the light beam of the various dispersion angles of class Bessel type light beam is further spread，Strengthen the random distribution of degree of divergence and dispersion angle，Reaching jointly makes the multifarious purpose of laser beam divergent angle degree，And the multiformity of dispersion angle can result in the light path difference of light transmission，Different optical path differences causes different phase place changes，So as to phase place is identical or the probability of phase difference constant is just substantially reduced，Destroy one of condition for interfering，Therefore alleviate speckle effect during degree of coherence and the LASER Light Source application of laser，The purpose of dissipation speckle is reached.
Technical solution of the present invention carries out dissipation speckle by using the combination of conical mirror and diffusion sheet, the characteristics of gaussian laser type Energy distribution can fundamentally be changed, so as to effectively eliminate the coherence that gaussian shaped profile light beam has in itself, and the opticses quantity used in light path is few, optics framework is simple, easy to utilize.
Technical solution of the present invention additionally provides a kind of two-color laser light source, including blue laser and red laser, by dissipation speckle being carried out using above-mentioned dissipation speckle light path to red laser, red laser is reached through the collective effect of conical mirror and diffusion sheet makes the multifarious purpose of laser beam angle, so as to destroy the interference condition of phase place or constant phase difference, mitigate the degree of coherence of red laser light beam, due to human eye it is more sensitive to the speckle effect of red laser, reduce the speckle effect when degree of coherence of red laser also just alleviates two-color laser light source applications, reach the purpose to two-color laser light source dissipation speckle.
And, in technical solution of the present invention, green fluorescence is inspired after blue laser incident fluorescence wheel, green fluorescence and blue laser are sequentially output according to sequential by a fluorescence wheel component, closing light is carried out by a closing light part with the red laser Jing after dissipation speckle, blue laser and green fluorescence again, dissipation speckle light path and combining and closing light part are few, and optics framework is succinct, and can provide the laser lighting light source of low speckle, high brightness.
The trichroism laser that technical solution of the present invention is provided, light beam all the way is formed after the trichroism LASER Light Source ECDC light, and the laser dissipation speckle light path constituted through conical mirror and diffusion sheet, the mechanism of dissipation speckle is combined based on above-mentioned conical mirror and diffusion sheet, the trichroism LASER Light Source that technical solution of the present invention is provided effectively can dissipate speckle, there is provided low speckle, the laser lighting light source of high brightness.
Description of the drawings
Fig. 1 is prior art conical mirror paths schematic diagram；
Fig. 2 is class bessel beam hot spot distribution schematic diagram；
Fig. 3 A are prior art Gaussian-shaped beam distribution schematic diagram；
Fig. 3 B are Gaussian-shaped beam hot spot distribution schematic diagram；
Fig. 4 is the laser dissipation speckle light path schematic diagram that the embodiment of the present invention 1 is provided
Fig. 5 be the embodiment of the present invention 1 in after conical mirror Laser beam energy distribution schematic diagram；
Fig. 6 be the embodiment of the present invention 1 in after diffusion sheet Laser beam energy distribution schematic diagram；
Fig. 7 is the laser dissipation speckle light path schematic diagram that the embodiment of the present invention 2 is provided；
Fig. 8 is Laser beam energy distribution schematic diagram in the embodiment of the present invention 2；
Fig. 9 is the two-color laser light-source structure schematic diagram that the embodiment of the present invention 3 is provided；
Figure 10 is the two-color laser light-source structure schematic diagram that the embodiment of the present invention 4 is provided；
Figure 11 is the trichroism LASER Light Source structural representation that the embodiment of the present invention 5 is provided.
Specific embodiment
In order that the object, technical solutions and advantages of the present invention are clearer, below in conjunction with accompanying drawing, the present invention is described in further detail, it is clear that described embodiment is only a part of embodiment of the invention, rather than the embodiment of whole.Based on the embodiment in the present invention, all other embodiment that those of ordinary skill in the art are obtained under the premise of creative work is not made belongs to the scope of protection of the invention.
Before the specific embodiment of the invention is introduced, the optical characteristics of conical mirror are introduced first, conical mirror has a conical surface and a plane, and wherein light is incident from plane side, and can be used to producing can increase diameter, but be consistent the non-diffraction annular beam of annular thickness with distance.As shown in figure 1, when parallel beam incident is to conical mirror plane side, effect of the refraction with focus convergence of the Jing conical surfaces, but the light through the E outgoing of conical surface summit is dissipated to multiple directions, so as to beam energy is disperseed.Due to having convergence and the optical effect for dissipating to light beam simultaneously, the diamond crossing area of a light beam can be formed in the exit direction of conical mirror, dash area as shown in Figure 1, when in this region, when carrying out imaging than X/Y plane as shown in FIG. 1, it is observed that concentric multiple annular beams, as schematically shown in Figure 2.Wherein, in multiple concentric annular light beams, the light beam positioned at internal layer or the beam energy near light beam ring center are weaker, and the light beam ring energy positioned at outer layer is stronger, with the shade of light beam ring illustrating the contrast situation of light beam ring energy intensity in figure.
Embodiment 1
The embodiment of the present invention 1 provides a kind of laser dissipation speckle light path, as shown in figure 4, including laser instrument 1, can be one or more groups of, send laser, the laser instrument can be blue laser or red laser or green laser, specifically not limit concrete color.
Diffusion sheet 4 after conical mirror 3 is provided with dissipation speckle light path and conical mirror is placed in, conical mirror 3 and diffusion sheet 4 are combined as the core component of dissipation speckle.Wherein, conical mirror is homogenized for carrying out Energy distribution to incident laser beam, change gaussian laser type beam energy distribution pattern, diffusion sheet is for carrying out the laser beam after Energy distribution is homogenized and be diffused to above-mentioned, further functioning as increases the degree of divergence of laser beam, strengthens dispersion angle variation.
Specifically, the laser spot diameter sent due to laser instrument is about in 60mm or so, to improve the efficiency of transmission and shaping efficiency of laser beam, also include shrink beam part 2 in the dissipation speckle light path, for the laser beam of large spot is carried out shrink beam, reduce facula area, so that light beam can all by the transmission in follow-up opticses-conical mirror, loss of the luminous energy in transmitting procedure is reduced, and improves shaping efficiency of the conical mirror to laser beam.In embodiments of the present invention, shrink beam part 2 is located between laser instrument 1 and conical mirror 3.In being embodied as, as shown in figure 4, shrink beam part 2 can be the telescopic system of a piece of convex lenss and a piece of concavees lens composition, the laser facula area after telescopic system reduces, the shrink beam of light beam is carried out such that it is able to which being easily that conical mirror 3 is whole by next optical glass receives.
In embodiments of the present invention, conical mirror 3 is specifically as follows Conical Lenses, and its opticses section is circle, is easy to receive circular oval or square laser facula, and processing cost is low.
Wherein, as it was previously stated, according to the optical characteristics of conical mirror 3, when along lens plane to conical surface incident beam be Gaussian-shaped beam when, Gaussian laser light beam can be converted into class Bessel type light beam, laser beam is carried out homogenizing shaping.Fig. 3 A illustrate the distribution schematic diagram of Gaussian-shaped beam, energy is concentrated near optical axis, the beam energy of the neighbouring angle of i.e. 0 degree and optical axis accounts for the overwhelming majority of whole laser beam, energy is more concentrated, and in same light source, the incident angle of light beam is identical, phase place or constant phase difference, and this is the main cause for causing laser spatial coherence strong.Fig. 3 B illustrate the schematic diagram of laser coherence light source hot spot, and spot center site color depth, optical energy density are big, therefore coherence is also most strong.
When laser beam is through conical mirror or Conical Lenses, the light beam of gaussian shaped profile is broken up to form class Bessel type light beam, class Bessel type light beam is multiple homocentric pencil of rays rings, and optical path difference and phase contrast diversity of the different light beam rings in transmitting procedure be larger, has exceeded coherence length（Coherence length refers to the maximum optical path difference that the light source with certain spectrum width can be interfered）, so as to reduce the probability for interfering between multiple smooth beam rings to a certain extent.And, part is broken up by Conical Lenses by the light beam on conical mirror cone angle summit, increases the angle of the angle of divergence of light beam, also increases the multiformity of dispersion angle.As laser beam becomes the distribution of class Bessel type light beam ring, its Energy distribution also changes therewith, as shown in Figure 5.Wherein, the longitudinal axis represents the Energy distribution intensity of light beam, and transverse axis represents the degree of divergence of the dispersion angle or light beam formed with 0 degree of optical axis.Comparison diagram 3A understands that the beam energy distribution of former Gaussian becomes the multi-angle beam energy distribution mode shown in Fig. 5.Wherein, energy intensity in Fig. 5 near 0 degree or optical axis shared by the light beam at angular dispersed angle drastically dies down, ratio is greatly reduced, and this segment beam angle of incidence is identical, phase place or constant phase difference, direction of vibration are identical, are the main causes for causing laser spatial coherence strong, by the energy proportion for significantly weakening this segment beam, the spatial coherence of laser can be effectively reduced.Meanwhile, the beam energy distribution curve of a plurality of dispersion angle is also shown in figure, the energy proportion that the light beam of each dispersion angle is shared in whole light beam increases, and the beam energy of each dispersion angle homogenizes distribution relatively.Namely, after conical mirror, due to disperse function of the cone angle to light beam, beam energy distribution in angle near 0 degree or optical axis is no longer excessively concentrated but is broken up, form the light beam of many dispersion angles, phase contrast diversity between many diverging angular light beams strengthens, and the probability for interfering is substantially reduced, so as to the spatial coherence for also causing whole LASER Light Source dies down.
In embodiments of the present invention, after diffusion sheet 4 is located at conical mirror 3, for being diffused to the class Bessel type light beam of 3 outgoing of Jing conical mirrors, playing strengthens the effect of eliminating coherence.This is because, although class Bessel type light beam has multiple homocentric pencil of rays rings, the distance between light beam ring has exceeded the coherence length of light beam, it is unfavorable for interfering between the light beam of each light beam ring, but between the light beam in each light beam ring still within the scope of coherence length, so as to still have stronger coherence.Therefore, in the present embodiment, diffusion sheet 4 is additionally provided with after conical mirror 3.Preferably, diffusion sheet of the diffusion sheet 4 for motion, it can be rotary motion, it can also be translational motion, as the diffusion sheet for moving can increase the random distribution of the degree of divergence to laser beam and dispersion angle, increase the random space phase of laser beam, compared to the diffusion sheet being fixedly installed, dissipation speckle is better.
The diffusion sheet of motion needs to drive by driving means, and driving means can be realized using prior art, not elaborated in embodiments of the present invention.
Diffusion sheet 4 is in motor process, play a part of uniform diffusion, therefore, it is possible to be spread to each light beam ring of class Bessel type light beam respectively, further increase the randomness of the angle of divergence and dispersion angle of each light beam ring light, by with conical mirror 3 to gaussian laser type light beam to break up effect superimposed, reaching makes the multifarious purpose of laser beam divergent angle degree, and the multiformity of dispersion angle can result in the optical path difference of light transmission, so-called optical path difference refers to that two-beam reaches the difference of the light path of certain point, is the amount for showing interference fringe property.In embodiments of the present invention, the two-beam of the different dispersion angles that same light source sends, in same Propagation, its optical path difference simply can be derived by by geometric path difference.For example, the light of 0 degree of light and 5 degree of dispersion angles reaches same optical glass（It is regarded as same point）When, the geometric path experienced by 5 degree of light more than 0 degree of light, so as to have certain optical path difference, according to phase contrast=2 π/λ × optical path difference（λ is the wavelength in vacuum, in the present embodiment, is laser of the same race, and λ is identical）, different optical path differences causes different phase place changes, so as to phase place is identical or the probability of phase difference constant is just substantially reduced, destroys one of condition of interference, so as to alleviate speckle effect during degree of coherence and the LASER Light Source application of laser.
Simultaneously, due to the STOCHASTIC DIFFUSION of diffusion sheet, random redistribution can be carried out to dispersion angle, so as to the light beam to the wide-angle angle of divergence in the distribution of class Bessel type, and the light beam near 0 degree of optical axis is homogenized again, reduce the beam energy of the wide-angle angle of divergence, and the beam energy near 0 degree of optical axis is suitably strengthened, improve whole light beam homogenizes degree.Laser beam energy distribution schematic diagram after diffusion sheet 4 is as shown in fig. 6, contrast Fig. 5 understands that the beam energy of both sides dispersion angle decreases, and the beam energy near 0 degree of optical axis has been lifted.In practical application, expect that the light energy near optical axis is stronger, it is easy to improve optical efficiency of the light beam in by each optical glass, the optical wand for being particularly advantageous for rear end x ray machine part is collected, the restriction of ranges of incidence angles when collecting light beam due to optical wand, can be because being lost more than ranges of incidence angles for the diverging light for deviateing optical axis wide-angle farther out, it is impossible to complete to collect.Therefore by the diffusion homogenization again of diffusion sheet in technical solution of the present invention, by the Energy distribution for weakening high dispersion angle light beam to a certain extent, so as to reduce into light loss during optical wand, beneficial to raising light-source brightness, by the lifting to beam energy near 0 degree of optical axis, light beam is improved by optical efficiency during optical glass, while indirectly beneficial to the brightness for improving light source.
Jing after diffusion sheet 4, due to conical mirror and the collective effect of diffusion sheet, now the etendue quantitative change of laser beam is big, light beam is in divergent state, it is unfavorable for fully entering next opticses, easily cause light loss of energy, need the laser beam in divergent state is collimated or assembled, becoming parallel or less parallel light beam could be utilized again.
Further, the embodiment of the present invention also includes collimating components 5, for collimating to the laser beam Jing after conical mirror and diffusion sheet shaping diffusion, forms parallel or less parallel light beam to reduce dispersion angle, meets the incident angle requirement of next opticses.Specifically, collimating components be a piece of convex lenss or two panels convex lens group into convex lenss microscope group, the light beam that dissipates can be played a part of to collimate or be assembled.
In practical application, laser beam is comprehended at dissipation speckle to carry out closing light and enters light guide member, as previously mentioned, usually optical wand, optical wand has certain incident angle range, and dispersion angle exceedes the light beam of the incident angle range and will be unable to enter optical wand, causes the waste of luminous energy.If therefore collimating components 5 are not enough to the collimating effect of light beam, laser beam that can be using multi-disc convex lenss simultaneously to dissipating is collimated or is assembled, reduce the dispersion angle of light beam, so as to meet the incident angle requirement of light guide member, the light collection efficiency of light guide member is improved, so as to improve the brightness of laser lighting light source.
To sum up，The laser dissipation speckle light path that the embodiment of the present invention 1 is provided，The laser beam of gaussian shaped profile is broken up first with conical mirror to form class Bessel type light beam，Laser beam is carried out homogenizing shaping，Be changed into multiple dispersion angles from the Energy distribution mode for concentrating on 0 degree of optical axis and neighbouring dispersion angle and each dispersion angle the relatively homogenized distribution mode of energy，The beam section near 0 degree of optical axis causing laser coherence stronger is reduced significantly，Effectively reduce the spatial coherence of laser beam，And the diffusion sheet after being arranged on conical mirror，Laser beam after can homogenizing to carrying out Energy distribution is further spread，Such that it is able to the light beam of the various dispersion angles of class Bessel type light beam is further spread，Strengthen degree of divergence，Reaching jointly makes the multifarious purpose of laser beam divergent angle degree，And the multiformity of dispersion angle can result in the light path difference of light transmission，Different optical path differences causes different phase place changes，The condition that destruction is interfered，Therefore alleviate speckle effect during degree of coherence and the LASER Light Source application of laser，The purpose of dissipation speckle is reached.
The embodiment of the present invention 1 carries out dissipation speckle by using the combination of conical mirror and diffusion sheet, the characteristics of gaussian laser type Energy distribution can fundamentally be changed, such that it is able to the coherence that the laser beam for relatively effectively eliminating gaussian shaped profile has in itself, opticses quantity used in light path is few, optics framework is simple, easy to utilize.
Embodiment 2
In the embodiment of the present invention 2 unlike embodiment 1, shrink beam part 2 can also adopt a piece of big convex lenss, and the summit of conical mirror 3 is located at one times of focal position of a piece of convex lenss, as shown in Figure 7.
As shown in Figure 1, the cone angle apex of conical mirror to the refraction action of light clearly, be in divergent state by the light that the summit is projected.When the summit of conical mirror 3 is located at one times of focal position of convex lenss, summit of the light after assembling can more planoconvex lens by conical mirror 3, break up so as to carry out stronger degree to more light beams, it is easy to class Bessel type beam distribution is changed over for the laser beam of Gaussian, the degree disperseed to the beam energy of dispersion angle near 0 degree and optical axis and slackened is higher, and the degree that homogenizes of beam energy distribution is strengthened.Beam energy distribution schematic diagram as shown in Figure 8, the longitudinal axis represent the Energy distribution intensity of light beam, and transverse axis represents the degree of divergence of the dispersion angle or light beam formed with 0 degree of optical axis.Contrast Fig. 5 and Fig. 7 understands, improve away from the beam energy ratio of the high dispersion angle of optical axis in the figure 7, the beam energy intensity of 0 degree and light shaft attachment dispersion angle is further reduced, so as to same incident angle, same phase place, beam energy of same direction of vibration etc. reduces degree more very compared to embodiment 1, advantageously in the eliminating coherence or dissipation speckle of laser.
Same as Example 1 is, in the embodiment of the present invention 2, conical mirror 3 is also equipped with diffusion sheet 4 below, the diffusion sheet that diffusion sheet is preferably moved, each light beam ring that class Bessel type light beam can be directed to further is spread, strengthening the multiformity of dispersion angle, further reducing the spatial coherence of laser beam, the purpose of speckle effect during so as to reducing laser coherence and LASER Light Source application.
Embodiment 3
The embodiment of the present invention 3 provides a kind of two-color laser light source, and the laser dissipation speckle light path described in embodiment 1 is applied in two-color laser light source framework.Specifically, as shown in Figure 9, two-color laser light source includes blue laser 11 and red laser 12, blue laser and red laser are sent respectively, blue laser and red laser can be respectively one group or multigroup, both can be with arranged in parallel, it is also possible to setting arranged vertically, can consider the complexity of closing light light path volume, radiator structure in the specific implementation being selected；And fluorescent wheel 3, it is arranged in blue laser emitting light path, including phosphor region（Not shown in figure）And transmission area（Not shown in figure）, phosphor region is provided with green emitting phosphor, for being excited generation green fluorescence, transmission area to be used to transmit the blue laser by blue laser.
For blue laser light path, blue laser 11 sends blue laser, according to rotation sequential, the fluorescent material area of a part of blue laser incident fluorescence wheel 3, excite fluorescent wheel to produce the green glow of one of three primary colours, a part of blue laser is passed through from the transmission area of fluorescent wheel, produce the blue light of one of three primary colours.
As described in example 1 above, the laser facula area sent from laser instrument is larger, in order to improve launching efficiency of the laser to fluorescence, and improve efficiency of transmission of the laser in opticses, need to be focused the laser facula that laser instrument sends diminution, the hot spot for forming little high-energy-density is got on the fluorescent material of fluorescent wheel 3.Therefore, the blue laser that blue laser 11 sends needs to be focused through the first focus lens group 27, forms little laser facula.First focus lens group 27 can include two panels convex lenss, as shown in Figure 9.In this two panels convex lens, the convex lens type arranged near laser instrument is larger, and for comprehensively receiving the hot spot that laser instrument directly sends, the convex lens type arranged near fluorescent wheel is less, for to the hot spot secondary focusing Jing after first piece convex lens focus, accelerating the diminution of facula area.And, in another kind of enforcement, the first focus lens group 27 can also include a telescopic system being made up of convex lenss and concavees lens, and a piece of convex lenss, first carry out shrink beam to laser beam, then be focused.
In embodiments of the present invention, in order to simplify the combining of blue laser and green fluorescence, reduce the use that optical axis changes eyeglass, using transmission-type fluorescent wheel, the fluorescent material of fluorescent wheel 3 is arranged on the transparent substrate or by fluorescent material and inorganic material, such as ceramics, and mixed sintering makes fluorescent material plate body, the plate body is transparent, can allow for light and passes through.And high thoroughly blue anti-green plated film is provided with the outside of phosphor powder layer, as the exit direction of the fluorescence being excited is along all directions, when part-green fluorescence is along when the outgoing of fluorescent wheel front, blue anti-green plated film can be such that green fluorescence is reflected and along the incident direction of blue laser from the outgoing of the fluorescent wheel back side to the height thoroughly, so as to, fluorescent wheel 3 can be sequentially output blue laser and green fluorescence according to sequential in rotary course.
Compared to reflection-type fluorescent wheel, the loop design of blue laser is eliminated, loop design generally includes condenser lenses, plane mirror etc., therefore saves the usage quantity and species of optical glass.
As the blue laser and green fluorescence dispersion angle Jing after 3 outgoing of fluorescent wheel is larger, collimation lens set 28 is additionally provided with 3 back side of fluorescent wheel, carry out being collimated into the output of parallel or less parallel light beam for the blue laser to dissipating and green fluorescence.Collimation lens set 28 generally includes two panels convex lenss, or a piece of hypersphere lens.
Collimated blue laser and green fluorescence reach closing light part 4, carry out closing light with red laser.
For red laser light path, the speckle effect sensitivity produced to red laser due to human eye is more than to blue laser, in embodiments of the present invention, it is specifically designed for red laser light path and is provided with dissipation speckle light path, for to the process of red laser dissipation speckle, mitigating as the use of red laser is for the impact that whole two-color laser light source speckle is deteriorated.
Specifically，The dissipation speckle light path referred in embodiment 1 is arranged，Red laser incident conical mirror 23 and diffusion sheet 24 successively Jing after shrink beam part 21 successively，Wherein，The core component of conical mirror 23 and diffusion sheet 24 as dissipation speckle，Shaping operation is homogenized to red laser gaussian shaped profile by conical mirror，Become the distribution of class Bessel type，Form multiple smooth beam rings，The light beam of original Relatively centralized distribution is broken up，The beam section near 0 degree of optical axis causing laser coherence stronger is reduced significantly，Effectively reduce the spatial coherence of laser beam，The distance between each light beam ring after breaing up increases，Coherence length is exceeded，Thus reduce the coherence between light beam ring，And the diffusion of the diffusion sheet of Jing motions，Light inside light beam ring is further spread and dispersion angle random distribution，The probability that light beam is interfered is reduced by way of increasing space random phase，So as to play a part of dissipation speckle to red laser.
In the present invention is embodied as, the dissipation speckle light channel structure of red laser can also adopt the optics framework provided by embodiment 2, i.e. red laser sequentially passes through a piece of convex lenss, the conical mirror being arranged at one times of focal position of convex lenss, and the diffusion sheet after conical mirror, conical mirror and diffusion sheet are identical with using optics framework role in embodiment 1, will not be described here, except for the difference that, conical mirror is arranged at one times of focal position of convex lenss, more light can be made to project by the diverging of conical mirror cone angle summit, it is also possible to causing the luminous energy born by conical mirror more, so as to temperature is higher, need the heat dispersion of raising system.
Red laser is after dissipation speckle, also through the second condenser lenses 25, the light beam to dissipating Jing after diffusion sheet 24 is collimated, otherwise as the beam optical extension quantitative change of diffusion diverging is big, the loss in luminous energy transmitting procedure cannot be caused completely into next opticses.
Collimated red laser also reaches closing light part 4, carries out closing light with blue laser and green fluorescence.
In embodiments of the present invention, closing light part 4 is specially a piece of dichroic mirror, by plated film, is transmissive to HONGGUANG and reflects blue light and green glow.
Light guide member 5 is reached after red laser, blue laser and green fluorescence ECDC light, carries out light collection, illumination to be provided for projector equipment ray machine.Light guide member is usually optical wand.A part of the optical wand as ray machine, the dmd chip for the three primary colours light of light source part sequential export to be conducted to ray machine are modulated, and project to.As optical wand has certain incident angle range, dispersion angle exceedes the light beam of the incident angle range and will be unable to enter optical wand, causes the waste of luminous energy, therefore three primary colours light is usual also through condenser lenses before light guide member is reached, to reduce dispersion angle.
In embodiments of the present invention, tertiary focusing lens 26 are provided with for being focused to three primary colours closing light, are made more light beams disclosure satisfy that the incident angle range of light guide member 5, is improved light-source brightness.
In embodiments of the present invention, red laser 12 and blue laser 11 are to be set up in parallel, before combining, needs carry out optical axis direction conversion to one of light path, to enable blue laser and red laser with orthogonal optical axis direction through a piece of dichroic mirror to transmit all the way, the mode for reflecting all the way carries out closing light.Therefore reflecting mirror 22 is provided with red laser light path, reflecting mirror 22 can be plane mirror.If red laser 12 and blue laser 11 are to be vertically arranged, two-way laser propagation direction is mutually perpendicular to, then need not carry out the conversion of optical axis direction, it is convenient to omit the use of reflection mirror component.
Due to human eye it is more sensitive compared to blue laser for the speckle effect of red laser, therefore, it is in two-color laser light source, just more necessary for the speckle issue that disappears of red laser.In embodiments of the present invention，By conical mirror and diffusion chip part are arranged in the light path of red laser，Such as the dissipation speckle process described in embodiment 1 or embodiment 2，The regularity of distribution of the red laser light beam of Gaussian is changed first with conical mirror，Light beam is carried out homogenizing shaping，The distribution mode that original energy is concentrated is become with the relatively homogenized distribution mode of certain dispersion angle and each dispersion angle energy，The beam section near 0 degree of optical axis causing laser coherence stronger is reduced significantly，And using the diffusion of diffusion sheet，Further increase the degree of divergence and dispersion angle random distribution of each light beam，By with conical mirror to gaussian laser type light beam to break up effect superimposed，May ultimately reach makes the multifarious purpose of beam divergence angle，The multiformity of dispersion angle can result in the optical path difference of light transmission，Different optical path differences causes different phase place changes，So as to phase place is identical or the probability of phase difference constant is just substantially reduced，Destroy one of condition of interference，So as to further mitigate the coherence of red laser，And then speckle effect when mitigation red laser light source and two-color laser light source applications.
Compared in prior art, using random phase device or the scheme of optical fiber dissipation speckle, laser dissipation speckle light path provided in an embodiment of the present invention carries out dissipation speckle using the combination of conical mirror and diffusion sheet, by the regularity of distribution for changing laser beam energy, increase the multiformity of beam divergence angle destroying coherent condition, the coherence that gaussian laser type distribution is brought in itself can fundamentally be changed, the spatial coherence of laser beam is effectively reduced.And the opticses quantity for being used is few, and small volume shared by opticses, optics framework is simple, easy to utilize.
Simultaneously, two-color laser light source framework provided in an embodiment of the present invention, to dissipation speckle part is increased in red laser light path, dissipation speckle has been carried out before closing light, to blue laser and green fluorescence, realize exporting in the same direction by using a transmission-type fluorescence wheel component, three reaches same closing light part and carries out closing light output, form three primary colours.The light source framework had both solved the problems, such as the speckle effect of red laser, can provide high-quality laser lighting light source, while combining and the closing light of three primary colours are also realized using less opticses, light source framework is simple, and small volume is easy to the miniaturization of laser equipment.
Embodiment 4
The embodiment of the present invention 4 is unlike embodiment 3, fluorescent wheel 3 is reflective fluorescent wheel, as shown in Figure 10, the fluorescence that reflective fluorescent wheel is excited to produce is projected towards the direction relative with blue laser incident direction by the reflection of aluminium base, before closing light part 4 is placed in fluorescent wheel 3.
In order to the fluorescence of the blue laser to transmiting and reflection is collimated, the front and back in fluorescent wheel 3 is needed to be provided with collimation lens set 28.Wherein blue laser will also be through relaying loop after the collimation lens set 28 at the fluorescent wheel back side, including the part such as relay lenss and plane mirror, and opticses 25 as shown in Figure 10 are back to closing light part 4.Closing light part 4 is a dichroic mirror, by plated film, realizes blue thoroughly red anti-green selection thoroughly.Therefore, can allow for blue laser and first transmit and be irradiated to fluorescence wheel surface, excite green emitting phosphor to send green fluorescence, the direct reflection in green fluorescence Jing non-fluorescence area, closing light part 4 is reached along with the incident relative direction of blue laser, Jing dichroic mirrors are reflected away.
For red laser light path, embodiment 1, or the dissipation speckle light path disclosed in embodiment 2 can be adopted in the same manner, after dissipation speckle light path, red laser reaches closing light part 4, is applied to up to condenser lenses the diminution for carrying out the angle of divergence by the transmission of closing light part 4.
In embodiments of the present invention, also with embodiment 1 or embodiment 2, its identical content is repeated no more the dissipation speckle light path mechanism of red laser again.
And, from unlike transmission-type fluorescent wheel, although reflective fluorescent wheel needs to carry out loop design for blue laser, but the conversion effect of fluorescence is of a relatively high, this is because during transmission-type fluorescent wheel is due to fluorescence excitation at present, heat accumulation is detailed, and radiating efficiency have impact on the conversion efficiency of fluorescence.
Above-mentioned embodiment, those skilled in the art can be selected according to the radiating of light-source system, Structural Design Requirement.
Embodiment 5
The embodiment of the present invention 5 provides a kind of specifically trichroism LASER Light Source framework, can carry out dissipation speckle based on the dissipation speckle light path described in embodiment 1 or 2.
Below as a example by based on embodiment 1, propose a kind of trichroism LASER Light Source structural representation of example, as shown in figure 11, tri-color laser 11,12,13 send redness, blue and green laser respectively, wherein, tri-color laser passes through two panels dichroic piece 21 respectively, 22 carry out closing light, a kind of light combination mode is given in this example only, it is also possible to using other closing light elements such as closing light mirror, do not limited and this.
By plated film, dichroic piece 21 realizes that red laser is transmitted, blue laser reflects, and dichroic piece 22 realizes the transmission of red laser and blue laser by plated film, the laser of three tunnel colors is formed output light all the way so as to pass through the light combination process of two panels dichroic piece by the reflection of green laser.
Output light all the way after the closing light passes through shrink beam part 23 first, specifically, can be the telescopic system that is made up of a piece of convex lenss and a piece of concavees lens, carry out the diminution of beam area, so that hot spot all by 3 part of conical mirror below can improve optical treatment efficiency.
The closing light of trichroism laser passes through conical mirror 3 and the combination of diffusion sheet 4 carries out dissipation speckle, and its mechanism is same as Example 1.Will not be described here.
And, other opticses not shown in the light-source structure figure of example of the present invention after diffusion sheet, part is assembled such as, for larger when the light dispersion angle Jing after diffusion sheet diffusion and be added when being unsatisfactory for the incident angle of rear end light collecting part-optical wand.If laser light beam of light combination dispersion angle meets optical wand incident angle requirement, can be without part to be assembled, such as convex lenss or convex lens group are directly entered optical wand.
It should be noted that，The speckle issue of trichroism laser is even more serious compared to one-wavelength laser or two-color laser light source，Therefore it is changed using the regularity of distribution of conical mirror pairing ray laser light beam in the embodiment of the present invention，Gaussian-shaped beam is carried out homogenizing shaping，The distribution mode that original energy is concentrated is become with the relatively homogenized distribution mode of certain dispersion angle and each dispersion angle energy，The beam section near 0 degree of optical axis causing laser coherence stronger is reduced significantly，And using the diffusion of diffusion sheet，Further increase the degree of divergence and dispersion angle random distribution of each laser light beam of light combination，By with conical mirror to gaussian laser type light beam to break up effect superimposed，May ultimately reach makes the multifarious purpose of beam divergence angle，The multiformity of dispersion angle can result in the optical path difference of light transmission，Different optical path differences causes different phase place changes，The condition that destruction is interfered，So as to further mitigate the coherence of LASER Light Source，Such scheme improves significantly for the speckle effect tool of trichroism LASER Light Source application.
Although preferred embodiments of the present invention have been described, but those skilled in the art once know basic creative concept, then other change and modification can be made to these embodiments.So, claims are intended to be construed to include preferred embodiment and fall into the had altered of the scope of the invention and change.
Obviously, those skilled in the art the present invention can be carried out it is various change and modification without departing from the spirit and scope of the present invention.So, if these modifications of the present invention and modification belong within the scope of the claims in the present invention and its equivalent technologies, then the present invention is also intended to comprising these changes and modification.
Claims (15)
1. a kind of laser dissipation speckle light path, including laser instrument, sends laser, it is characterised in that at least provided with conical mirror in the dissipation speckle light path, and the diffusion sheet being placed in after conical mirror,
The laser passes sequentially through the conical mirror and diffusion sheet,
Wherein, the conical mirror is for carrying out homogenizing shaping to the laser beam,
The diffusion sheet for it is described carry out homogenizing the laser beam after shaping be diffused.
2. dissipation speckle light path according to claim 1, it is characterised in that the conical mirror is Conical Lenses.
3. dissipation speckle light path according to claim 1 and 2, it is characterised in that the diffusion sheet does and rotates or translational motion.
4. dissipation speckle light path according to claim 1, it is characterised in that the dissipation speckle light path also includes shrink beam part, for the laser beam is carried out the incident conical mirror after shrink beam.
5. dissipation speckle light path according to claim 1, it is characterised in that the dissipation speckle light path also includes collimating components, forms collimated light beam for the light beam dissipated after diffusion is carried out collimation.
6. dissipation speckle light path according to claim 4, it is characterised in that the shrink beam part includes the telescopic system being made up of a piece of convex lenss and a piece of concavees lens.
7. dissipation speckle light path according to claim 5, it is characterised in that the collimating components include convex lenss or convex lenss microscope group.
8. a kind of two-color laser light source, including blue laser and red laser, send blue laser and red laser respectively；Fluorescent wheel, is arranged in blue laser emitting light path, and including phosphor region and transmission area, the phosphor region is provided with green emitting phosphor, for being excited generation green fluorescence, the transmission area to be used to transmit the blue laser by the blue laser, it is characterised in that
The fluorescent wheel is sequentially output blue laser and green fluorescence according to sequential, and closing light part is reached after the blue laser and the collimated lens group of green fluorescence；
The red laser reaches the closing light part Jing after dissipation speckle light path, at least provided with conical mirror in the dissipation speckle light path, and the diffusion sheet being placed in after conical mirror,
Wherein, the conical mirror is homogenized for the red laser light beam is carried out Energy distribution, and the diffusion sheet is for carrying out the red laser light beam after Energy distribution is homogenized and be diffused to described；
Export to light guide member after the blue laser, green fluorescence and red laser ECDC light.
9. LASER Light Source according to claim 8, it is characterised in that the conical mirror is Conical Lenses.
10. LASER Light Source according to claim 8 or claim 9, it is characterised in that the diffusion sheet does and rotates or translational motion.
11. LASER Light Sources according to claim 8, it is characterised in that the closing light part is dichroic mirror.
12. LASER Light Sources according to claim 8, it is characterised in that the dissipation speckle light path also includes shrink beam part, for the red laser light beam is carried out the incident conical mirror after shrink beam.
13. dissipation speckle light paths according to claim 8, it is characterised in that the dissipation speckle light path also includes collimating components, forms collimated light beam for the red laser dissipated after diffusion light beam is carried out collimation.
14. dissipation speckle light paths according to claim 11, it is characterised in that export to before light guide member after the blue laser, green fluorescence and red laser ECDC light also through assembling part, for reducing the angle of flare of light beam after the closing light.
A kind of 15. trichroism LASER Light Sources, including tri-color laser, send the trichroism laser of red, green, blue respectively, it is characterised in that after the tri-color laser ECDC light, and the laser dissipation speckle light path described in Jing claim 1-7 carries out dissipation speckle.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510643217.9A CN106569378B (en) | 2015-10-08 | 2015-10-08 | A kind of laser dissipation spot light path and two-color laser light source, three color laser light sources |
| PCT/CN2016/075911 WO2017059656A1 (en) | 2015-10-08 | 2016-03-09 | Laser dispersed spot optical path |
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| CN201510643217.9A CN106569378B (en) | 2015-10-08 | 2015-10-08 | A kind of laser dissipation spot light path and two-color laser light source, three color laser light sources |
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| CN106569378B (en) | 2018-09-21 |
| WO2017059656A1 (en) | 2017-04-13 |
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Effective date of registration: 20200819 Address after: 266555 Qian WAN port road, Huangdao District, Qingdao, Shandong Province, No. 218 Patentee after: Qingdao Hisense Laser Display Co.,Ltd. Address before: 266100 Zhuzhou Road, Laoshan District, Shandong, No. 151, No. Patentee before: HISENSE Co.,Ltd. |