Light-dividing device based on polarization spectroscope
Technical field
The present invention relates to laser lighting, display field, it is especially applicable to laser lighting, laser display and is with coherent light
The optical device and instrument of light source, specially a kind of light-dividing device based on polarization spectroscope.
Background technology
Laser display technology with its colour gamut it is broad, brightness is high, saturation degree is high and can more true reappearance nature it is colourful
The advantages of colorful color world, is increasingly subject to the concern of people.
Usually need the laser beam to be converted into the light beam of given shape and even intensity in laser display.Usually need
Use and can form a details in a play not acted out on stage, but told through dialogues region on fly-eye illumination system and X spectroscopes, but the corresponding image planes of X spectroscope crossover locations.
The solution of light splitting is employed in the U patents of CN 205353467, original optical path is divided into four light paths, reasonably compensate for X
There is the defect of dark fringe to spectroscope in picture screen center in projection systems, has been obtained for good display effect.But
The patent is that incident light is simply divided into the incidence of several regions, may be different per beam light optical property, so display effect
Can further improve.And light beam is divided into four bundles light by the present apparatus by simple structure, per beam light light intensity, wavelength, polarization etc.
Optical property is completely the same, further increases shimming display effect.In addition the present apparatus can directly and diffractive-optical element
(DOE) it is combined, the adjustable rectangular light spot of area can be exported, fly's-eye lens coverage rate can be improved, also further increases even
Effect, in addition DOE instead of the beams extended by lens system, reduce system cost.
No matter in the application of laser display or laser lighting, it is often necessary to obtain good by expanding lighting area
Illumination and shimming effect, and the method that is expanded using single beam of tradition, such as telescope beam-expanding system, with multiplying power
Improve, size can become very big, be unfavorable for making and use, and effect is usually not ideal enough.And the present apparatus is by simple
Optics, rational light channel structure, it is adjustable to obtain distance between very big lighting area, and each device of device, convenient
Used cooperatively with many optical systems.
Projection display system, particularly crystal projection and LCOS projection display systems, are all operated in polarization optical mode, and pass
The lighting source of system is unpolarized light source, so usually needing to be combined with polarization converter (PCS).The present apparatus is directly realized
Linearly polarized light is exported, it is not necessary to which polarization converter (PCS), capacity usage ratio is improved, while also reducing optical system
Cost.
The content of the invention
The invention provides a kind of light-dividing device based on polarization spectroscope, it expands illuminated area with simple structure
Product, obtains good shimming effect, and obtains linearly polarized light output, can be obtained in fields such as laser lighting, laser displays
Many applications.
The present invention adopts the following technical scheme that realization:A kind of light-dividing device based on polarization spectroscope, including light splitting
Component, the spectrum groupware includes polarization spectroscope, 1/2nd wave plates, completely reflecting mirror I, neutral beam splitter mirror I, completely reflecting mirror
II, neutral beam splitter mirror II and completely reflecting mirror III;Incident light enters polarization spectroscope, is divided into two-beam, and reflected light is S-polarization
Light, transmitted light is P polarization light;S-polarization light enters into 1/2nd wave plates and is converted into P polarization light, then anti-by completely reflecting mirror I
Penetrate, two-beam is divided into neutral beam splitter mirror I, wherein reflected light reflects by completely reflecting mirror II again, is adjusted to direction
It is consistent with transmitted light;P polarization light is directly entered neutral beam splitter mirror II and is divided into two-beam, and wherein reflected light is again by completely reflecting mirror
III reflect, be adjusted to direction consistent with transmitted light, be finally obtained polarize it is identical, light intensity is identical, four parallel bunch of direction
Polarization laser is exported.
Wherein, 1/2nd wave plates are glued together with polarization spectroscope.
Wherein, rectangular coordinate system is set up, completely reflecting mirror I, completely reflecting mirror II and completely reflecting mirror III angles are all adjustable, is adjusted
Angle at 45 ° is distinguished in completely reflecting mirror I positions to perpendicular to XOZ planes with X-axis, Z axis, adjusts completely reflecting mirror II and completely reflecting mirror
Distinguish angle at 45 ° with X-axis, Y-axis negative sense to perpendicular to XOY plane in III positions.
Wherein, neutral beam splitter mirror I and neutral beam splitter mirror II transmissions and reflectivity are 50/50.
Wherein, neutral beam splitter mirror I and neutral beam splitter mirror II angles are also adjustable, adjust neutral beam splitter mirror I and neutral beam splitter mirror
Angle at 45 ° is distinguished in II positions to perpendicular to XOY plane with X-axis, Y-axis negative sense, flat with completely reflecting mirror II and completely reflecting mirror III
OK.
Wherein, polarization spectroscope is connected with completely reflecting mirror I by mechanical structure, apart from adjustable meeting different optical system need
Will.
Wherein, completely reflecting mirror I is connected with neutral beam splitter mirror I by mechanical structure, apart from adjustable meeting different optical systems
Need.
Wherein, neutral beam splitter mirror I is connected with completely reflecting mirror II by mechanical structure, apart from adjustable meeting different optical systems
Need.
Wherein, polarization spectroscope is connected with neutral beam splitter mirror II by mechanical structure, apart from adjustable meeting different optical systems
System needs.
Wherein, neutral beam splitter mirror II is connected with completely reflecting mirror III by mechanical structure, apart from adjustable meeting different optical systems
System needs.
Wherein, by increasing neutral beam splitter mirror III, completely reflecting mirror IV, neutral beam splitter mirror IV and completely reflecting mirror V, and by it
Be adjusted to suitable position, six beams, eight beams even more multi-beam can be obtained, further expand lighting area.
The present invention can obtain different polarization light output by changing 1/2nd wave plates with polarization spectroscope gluing station
State.If 1/2nd wave plates are glued on the face of polarization spectroscope outgoing S-polarization light, P polarization light output can be obtained;If two points
One of wave plate be glued on the face of polarization spectroscope outgoing P polarization light, S-polarization light output can be obtained.
/ 2nd wave plates can realize that polarization state is rotated by 90 ° in certain wave-length coverage.Completely reflecting mirror and neutrality
Beam splitter is all without the polarization state for changing P polarization light and S-polarization light.Neutral beam splitter mirror can ensure in a wavelength range,
The Transflective of different wavelengths of light is than keeping constant.
During work, vertically into polarization spectroscope, with angle, 45 ° incide on polarizing coating incident light, are divided into two bunch
Polarised light, reflected light is linearly polarized light of the polarization direction perpendicular to the plane of incidence, and abbreviation S-polarization light, transmitted light is flat for polarization direction
Row in the linearly polarized light of the plane of incidence, abbreviation P polarization light, as shown in Figure 3.S-polarization light enters directly into 1/2nd wave plates upwards
It is converted into P polarization light, then is incided on completely reflecting mirror I with 45 ° upwards, be reflected by it, the light direction of propagation is changed into level
Direction, then incide neutral beam splitter mirror I with 45 °, is divided into two-beam, it is a branch of be reflected light it is a branch of be transmitted light, wherein reflecting
Light is reflected by completely reflecting mirror II again, is adjusted to direction and is transmitted parallel light, obtains two-beam in same level here;
And directly by the P polarization light of polarization spectroscope outgoing, being directly entered neutral beam splitter mirror II is divided into two-beam, wherein
Reflected light, then reflected by completely reflecting mirror III, direction is adjusted to and transmission parallel light, apparatus structure and upper horizontal plane here
Apparatus structure it is completely the same, two-beam is also obtain here.
Final to obtain that polarization is identical by a branch of non-polarized light, light intensity is identical, and four parallel bunch polarization lasers of direction are defeated
Go out, expand lighting area.
And distance is adjustable between each device of whole device, the need for being adapted to different optical systems.
Above is by taking four beam P polarization light of final acquisition as an example, as long as in fact 1/2nd wave plates and polarization spectroscope glue
The evolution of conjunction is to the side of direct transmitting P-type polarisation light, and other structures are constant.Finally can just obtain four beam S-polarization light.
The present invention has advantages below:
1. lighting area is big:The lighting area obtained compared with the method directly expanded using single beam wants big
Many, traditional single beam expands device complexity, and effect is also undesirable, expands lighting area and is conducive to improving shimming effect.
2. laser utilization ratio is high:Non-polarized light dress is directly changed to polarised light by the energy of at least loss 50%, and this
Device is by another road polarised light simple conversion so that capacity usage ratio is improved.
3. pair light source polarization no requirement (NR):A branch of non-polarized light, P polarization light or S-polarization can be converted into by the device
Light.
4. rational in infrastructure, device is simple, with low cost, it is easy to processing and installation.
5. whole device has adjustable structure, the need for meeting various optical systems.
6. each part is capable of achieving for a long time in device, and continuous-stable work, stable performance is safe and reliable.
The present invention utilizes the polarization spectro characteristic of polarization spectroscope, using 1/2nd wave plates, completely reflecting mirror, neutral beam splitting
The simple Devices such as mirror, identical, the light strongly consistent of polarization is obtained by single beam non-polarized light, and four parallel bunch polarised lights of direction expand
Big lighting area, is readily available the shimming effect of high-quality.And distance is adjustable between each device, different optics can be met
The need for system, apparatus structure is simple, stable, with low cost, in display and lighting technical field, has a extensive future.
Brief description of the drawings
Fig. 1 is P polarization light-dividing device schematic diagram of the present invention.
Fig. 2 is S-polarization light-dividing device schematic diagram of the present invention.
Fig. 3 is polarization spectroscope light splitting schematic diagram.
Fig. 4 is diffractive-optical element (DOE) and schematic diagram associated with collimation lens.
Fig. 5 is light-dividing device of the present invention and structural representation associated with diffractive-optical element (DOE).
Fig. 6 obtains six beam P polarization electro-optical device schematic diagrames for the present invention.
Reference implication is in figure:101 is polarization spectroscope, and 102 is 1/2nd wave plates, and 103 is completely reflecting mirror I,
104 is neutral beam splitter mirror I, and 105 is completely reflecting mirror II, and 106 is neutral beam splitter mirror II, and 107 is completely reflecting mirror III, and 401 is optics
Diffraction element (DOE), 402 is collimation lens, and 608 is neutral beam splitter mirror III, and 609 is completely reflecting mirror IV, and 610 is neutral beam splitting
Mirror IV, 611 is completely reflecting mirror V.
Specific embodiment
Specific embodiment of the invention is described in detail below in conjunction with the accompanying drawings.
The present invention provides 3 embodiments altogether.Light-dividing device wherein described in embodiment 1 is finally obtained P polarization light, implements
Light-dividing device described in example 2 is finally obtained S-polarization light, and both schemes belong to a total inventive concept, because only needing to
Change the position of 1/2nd wave plates on polarization spectroscope, you can realize transformation.And embodiment 3 is the light-dividing device and optics spreads out
Situation associated with element (DOE) is penetrated, circular output facula rectangular output facula can be changed, because many optical projection systems need
The rectangular devices such as fly's-eye lens are used, and adjustable rectangular light spot further can improve illumination in the case where luminous energy is not lost
Bright area, there is provided better shimming effect.
Embodiment 1:The light-dividing device of P polarization light:
Fig. 1, a kind of light-dividing device based on polarization spectroscope, including spectrum groupware are refer to, the spectrum groupware includes
Polarization spectroscope 101,1/2nd wave plates 102, completely reflecting mirror I 103, neutral beam splitter mirror I 104, completely reflecting mirror II 105, in
Property beam splitter II 106 and completely reflecting mirror III 107;/ 2nd wave plates 102 are glued at the outgoing S-polarization light of polarization spectroscope 101
Face on, be all fixedly connected by mechanical parts between each device of device, and distance is adjustable between each device of device.
During work, such as Fig. 1, vertically into polarization spectroscope 101, with angle, 45 ° incide on polarizing coating incident light, are divided
Into two bunch polarised lights, reflected light is S-polarization light, and transmitted light is P polarization light.S-polarization light enters directly into 1/2nd upwards
Wave plate 102 is converted into P polarization light, then is incided on completely reflecting mirror I 103 with 45° angle upwards, and I 103 is vertical for the completely reflecting mirror
In XOZ planes, angle at 45 ° is distinguished with X-axis, Z axis, be reflected by it, the light direction of propagation is become horizontally, then with 45 °
Neutral beam splitter mirror I 104 is incided at angle, and neutral beam splitter mirror I 104 is at 45 ° with X-axis, Y-axis negative sense difference perpendicular to XOY plane
Angle, its Transflective ratio is 50/50, is divided into two-beam, it is a branch of be reflected light it is a branch of be transmitted light, wherein reflected light again by
Completely reflecting mirror II 105 reflects, and completely reflecting mirror II 105 distinguishes angle at 45 ° perpendicular to XOY plane with X-axis, Y-axis negative sense,
It is placed in parallel with neutral beam splitter mirror I 104, is adjusted to reflection light direction and transmits parallel light, is obtained in same level here
Obtained two-beam;Directly by the P polarization light of the outgoing of polarization spectroscope 101, neutral beam splitter mirror II 106 is directly entered, the neutrality point
Beam mirror II 106 perpendicular to XOY plane, with X-axis, Y-axis negative sense distinguish angle at 45 ° (equivalent to from neutral beam splitter mirror I 104 to
Lower translation is obtained), its Transflective is divided into two-beam than being also 50/50, and wherein reflected light is again by completely reflecting mirror III 107
Reflection, completely reflecting mirror III 107 distinguishes angle at 45 ° (equivalent to by being totally reflected perpendicular to XOY plane with X-axis, Y-axis negative sense
Translation is obtained mirror II 105 downwards), reflection light direction is adjusted to and transmission parallel light, apparatus structure and upper horizontal plane here
Apparatus structure it is completely the same, two-beam is also obtain here and its optical property is identical with preceding two-beam.
/ 2nd wave plates 102 can realize that polarization state is rotated by 90 ° in certain wave-length coverage.Completely reflecting mirror and
Neutral beam splitter mirror is all without the polarization state for changing P polarization light and S-polarization light.Neutral beam splitter mirror I 104 and neutral beam splitter mirror II
106 can ensure in a wavelength range, and the Transflective of different wavelengths of light is than keeping constant.
Final to obtain that polarization is identical by a branch of non-polarized light, light intensity is identical, four parallel beam P polarization light outputs of direction,
Expand lighting area.And because the distance of device in whole device is all adjustable, the size of output facula, distance is all adjustable,
The need for different optical systems can be met.
Embodiment 2:The light-dividing device of S-polarization light:
Fig. 2, a kind of light-dividing device based on polarization spectroscope, including spectrum groupware are refer to, the spectrum groupware includes
Polarization spectroscope 101,1/2nd wave plates 102, completely reflecting mirror I 103, neutral beam splitter mirror I 104, completely reflecting mirror II 105, in
Property beam splitter II 106 and completely reflecting mirror III 107;/ 2nd wave plates 102 are glued at the outgoing P polarization light of polarization spectroscope 101
Face on, be all fixedly connected by mechanical parts between each device of device, it is possible to change the distance between each device of device.
During work, such as Fig. 1, vertically into polarization spectroscope 101, with angle, 45 ° incide on polarizing coating incident light, are divided
Into two bunch polarised lights, reflected light S-polarization light, transmitted light is P polarization light.S-polarization light is incided with 45° angle be all-trans directly up
Penetrate on mirror I 103, completely reflecting mirror I 103 distinguishes angle at 45 ° perpendicular to XOZ planes with X-axis, Z axis, is reflected by it, and makes light
The line direction of propagation becomes horizontally, then incides neutral beam splitter mirror I 104 with 45° angle, neutral beam splitter mirror I 104 perpendicular to
XOY plane, angle at 45 ° is distinguished with X-axis, Y-axis negative sense, and its Transflective ratio is 50/50, is divided into two-beam, and a branch of is anti-
It is transmitted light to penetrate light a branch of, and wherein reflected light is reflected by completely reflecting mirror II 105 again, and completely reflecting mirror II 105 is flat perpendicular to XOY
Face, angle at 45 ° is distinguished with X-axis, Y-axis negative sense, is placed in parallel with neutral beam splitter mirror I 104, make reflection light direction be adjusted to
Transmission parallel light, obtains two-beam in same level here;Directly by the P polarization light of the outgoing of polarization spectroscope 101, enter
It is mapped to 1/2nd wave plates 102 and is converted into S-polarization light, enters back into neutral beam splitter mirror II 106, neutral beam splitter mirror II 106
Perpendicular to XOY plane, distinguish angle at 45 ° with X-axis, Y-axis negative sense and (translated downwards equivalent to by neutral beam splitter mirror I 104
To), its Transflective is divided into two-beam than being also 50/50, and wherein reflected light is reflected by completely reflecting mirror III 107 again, and this is complete
Speculum III 107 distinguishes angle at 45 ° (equivalent to by completely reflecting mirror II 105 perpendicular to XOY plane with X-axis, Y-axis negative sense
Translation downwards is obtained), reflection light direction is adjusted to and transmission parallel light, apparatus structure and the device knot of upper horizontal plane here
Structure is completely the same, two-beam is also obtain here and its optical property is identical with preceding two-beam.
Final to obtain that polarization is identical by a branch of non-polarized light, light intensity is identical, four parallel beam S-polarization light outputs of direction,
And due between device device distance it is adjustable, emergent light spot size, position are all adjustable, meet the demand of different optical systems.
Uniquely difference is exactly that have changed 1/2nd wave plates 102 and the glue of polarization spectroscope 101 to embodiment 2 with embodiment 1
Close position.
Embodiment 3:Obtain the light-dividing device of rectangular light spot:
Embodiment 3 is built upon on the basis of embodiment 1 and 2, and an optical diffraction unit is added behind embodiment 1 and 2
Part (DOE) 401 and collimation lens 402, they are fixedly connected by mechanical parts, apart from adjustable.Fig. 4 is refer to, during work, by reality
The circular light spot emergent light for applying example 1 or implementation 2 enters diffractive-optical element (DOE), is converted into rectangular light spot, then saturating by collimation
Mirror, becomes parallel light emergence.Diffraction optical element (DOE) does not interfere with the polarization state (except sub-wavelength) of laser.So will not
Change the linear polarization output characteristics of the light-dividing device.Its whole structure is as shown in Figure 5.Diffraction optical element (DOE) has two
Effect:First, circular light spot is made to become the adjustable rectangular light spot of area, when being combined with the rectangular optical device such as fly's-eye lens, can be with
Coverage rate is further improved, more preferable shimming display effect is obtained;2nd, DOE instead of the beams extended by lens system also with effect is expanded
System, simplifies system architecture, reduces system cost.
Above-described three kinds of embodiments, can be according to independent assortment the need for different optical systems.
More preferably, whole light-dividing device can be upgraded as needed, as long as increasing neutral beam splitter mirror and completely reflecting mirror,
And they are adjusted to suitable position, and six beams, eight beams even more multi-beam can be obtained, further expand lighting area.Fig. 6
Exactly obtain the brief installation drawing of six beam P polarization light.
It should be noted last that, the above embodiments are merely illustrative of the technical solutions of the present invention and it is unrestricted, although ginseng
The present invention has been described in detail according to embodiment, it will be understood by those within the art that, to technical side of the invention
Case is modified or equivalent, and without departure from the spirit and scope of technical scheme, it all should cover the present invention
Claims in.