CN113391455B - Rod mirror array device for splicing and synthesizing optical fiber laser array beams - Google Patents
Rod mirror array device for splicing and synthesizing optical fiber laser array beams Download PDFInfo
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- CN113391455B CN113391455B CN202110656820.6A CN202110656820A CN113391455B CN 113391455 B CN113391455 B CN 113391455B CN 202110656820 A CN202110656820 A CN 202110656820A CN 113391455 B CN113391455 B CN 113391455B
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- G—PHYSICS
- G02—OPTICS
- 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
- G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
- G02B27/0911—Anamorphotic systems
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- G—PHYSICS
- G02—OPTICS
- 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
- G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
- G02B27/0938—Using specific optical elements
- G02B27/095—Refractive optical elements
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- G—PHYSICS
- G02—OPTICS
- 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
- G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
- G02B27/0938—Using specific optical elements
- G02B27/0994—Fibers, light pipes
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/262—Optical details of coupling light into, or out of, or between fibre ends, e.g. special fibre end shapes or associated optical elements
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Abstract
The invention provides a rod mirror array device for splicing and synthesizing optical fiber laser array beams, which comprises rod mirrors and a base, wherein optical fibers or optical fiber end caps are fixed at the first end of the base, rod mirrors which are one-to-one opposite to the optical fibers or the optical fiber end caps are installed at the second end of the base opposite to the first end of the base, all the rod mirrors are arranged into a rod mirror array according to a set mode, unit beams to be spliced and synthesized are incident to the rod mirrors through the optical fibers or the optical fiber end caps, the unit beams with corresponding shapes are generated through the rod mirrors, and the rod mirror array is spliced into optical fiber laser array beams with corresponding shapes and arranged to be output. The invention can greatly relieve the contradiction between the high light beam duty ratio and the small array light beam size and realize the compact arrangement of light beams in any shapes.
Description
Technical Field
The invention relates to the technical field of optical fiber laser array beam synthesis, in particular to a rod mirror array device for splicing and synthesizing optical fiber laser array beams.
Background
The output power of a single fiber laser is limited by physical factors such as nonlinear effects and the threshold of laser loss of materials, and various beam combining methods have been proposed to obtain higher power output. The space beam splicing and synthesizing method is one of the methods which are widely applied, and is mainly realized by directly splicing a lens array or an optical fiber collimator at present. Since direct splicing with a lens array or fiber collimator necessitates the presence of mechanical supports, both high beam duty cycle and small array beam size are difficult to achieve. In addition, the unit beam spots of the array beam are mostly circular, and the arrangement shape and the compactness of the array beam are also limited.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a rod mirror array device for splicing and synthesizing optical fiber laser array beams.
In order to achieve the technical purpose, the invention adopts the technical scheme that:
a rod mirror array device for optical fiber laser array beam splicing synthesis, including rod mirror and base, optic fibre or optic fibre end cap are fixed at the first end of base, the rod mirror that is relative with optic fibre or optic fibre end cap one-to-one is installed to the base second end relative with the first end of base, all rod mirrors are arranged into the rod mirror array according to the mode of setting for, the unit light beam of waiting to splice the synthesis incides the rod mirror through optic fibre or optic fibre end cap and produces the unit light beam of corresponding shape through the rod mirror, splice into the fiber laser array light beam output that corresponds the shape, arranges by the rod mirror array.
As a preferred embodiment of the present invention, the first end of the base is provided with an optical fiber positioning element installation hole, the optical fiber positioning element installation hole is used for installing an optical fiber positioning element, and the output optical fiber or the optical fiber end cap of each unit light beam is respectively installed in the corresponding optical fiber positioning element.
As a preferred scheme of the present invention, rod mirror mounting holes are formed at the second end of the base, the rod mirror mounting holes are opposite to and communicated with the optical fiber positioning member mounting holes, and each rod mirror is mounted in the corresponding rod mirror mounting hole. Installation requires that the focal plane of each rod mirror be located at the output end face of the corresponding fiber or at the fusion point of the fiber end cap.
According to different application requirements, the rod mirror is a cylindrical mirror with a circular cross section or a polygonal rod mirror with a polygonal cross section, and circular or polygonal unit beam light spots are generated through the rod mirror. The rod mirrors with different cross section shapes can be used for generating unit beam spots with different shapes, so that optical fiber laser array beams with different shapes are spliced. For example, the rod mirrors are hexagonal rod mirrors with regular hexagonal cross sections, the hexagonal unit beam spots are generated through the hexagonal rod mirrors, all the rod mirrors are closely arranged in a honeycomb rod mirror array without intervals, and splicing and synthesis of honeycomb array beams can be achieved. Or the rod mirrors are square rod mirrors with square cross sections, square unit light beam spots are generated through the four rod mirrors, all the rod mirrors are closely arranged in a square rod mirror array without intervals, and splicing and synthesis of square array light beams can be achieved. The invention can also realize the splicing and synthesis of array beams with more shapes and arrangement forms. In addition, the arrangement mode of the rod mirror array is not limited, and various special light spots such as annular light spots and light spots shaped like Chinese character 'hui' can be obtained through the design of the arrangement mode of the rod mirrors in the rod mirror array.
In a preferred embodiment of the present invention, the rod mirror is an integrally formed monolithic structure made of high transmittance optical glass or crystalline material, such as fused silica glass. The rod mirror is divided into two sections, a first section of the rod mirror extends into the rod mirror mounting hole and is used for mounting the rod mirror on the base, and the end face of the first section of the rod mirror is a laser surface of the rod mirror; the second section of the rod mirror is positioned outside the base, the end surface of the second section of the rod mirror is a laser emergent surface of the rod mirror, and the laser incident surface and the laser emergent surface are used for collimating and/or shaping light beams incident into the rod mirror. And polishing the laser emergent surface and the laser incident surface, and plating an antireflection film for the incident laser wavelength.
When the output beam of the rod mirror is required to be a gaussian beam, the rod mirror only needs to collimate the beam incident into the rod mirror, so that the laser incident surface can be a plane or a spherical surface, and the laser emergent surface is a spherical surface. When the output light beam of the rod mirror is required to be a Gaussian light beam, the structural parameters of the rod mirror are designed according to the shape and the size of the unit light beam to be output, and the method comprises the following steps: setting the light spot of the unit beam to be output as a circle or a regular polygon with a diameter or an inscribed circle thereofHas a diameter of
The percentage of laser energy in the diameter of a light spot or the diameter of an inscribed circle of the unit light beam in the total energy of all the unit light beams is P; acquiring a maximum divergence angle full angle A and a divergence angle full angle B with energy ratio of P of unit beams to be spliced and synthesized; determining the diameter or diameter of the inscribed circle of the second section of the rod lens
The first section of the rod mirror has a circular cross section and a diameter D2Length of L2The size and shape of the first section of the rod mirror can ensure that the rod mirror can be stably installed on the base. The first section of the rod lens is primarily for mounting the rod lens on the base, and therefore is primarily considered to be a reasonable dimension for the base support structure, e.g. diameter D of the first section of the rod lens2Second segment D of rod mirror11mm small, the length L of the first section of the rod mirror2Is 3-5 mm. The distance between the rod mirror and the output end face of the optical fiber is L3According to the formula F ═ L1+L2+L3And formula
Determine focal length F and distance L of rod lens simultaneously3Wherein beta is the divergence angle full angle of the light beam after the light beam with the divergence angle full angle B enters the rod mirror
To find, n is the refractive index of the rod mirror material at the emitted laser wavelength band. Further, in order to allow the laser light incident on the rod mirror to be output entirely through the rod mirror, it is required to satisfy the requirements
Wherein alpha is the divergence angle full angle of the light beam after the light beam with the divergence angle full angle A enters the rod mirror, and the divergence angle full angle can be represented by the formula
And (6) obtaining.
When the output beam of the rod mirror is required to be a flat-top beam or other form of beam, the rod mirror needs to collimate and shape the beam incident into the rod mirror at the same time, so that the laser incident surface and the laser exit surface of the rod mirror may be aspheric. And polishing the laser emergent surface and the laser incident surface, and plating an antireflection film for the incident laser wavelength.
As a preferable scheme of the invention, the cross section shape and the size of the first section of the rod mirror are adapted to the cross section shape and the size of the rod mirror mounting hole, the outer side surface of the first section of the rod mirror can be subjected to roughening treatment, and the rod mirror mounting hole can be more stably fixed. The cross section of the second section of the rod mirror is a circular, polygonal or other curved surface, and the outer side surface of the second section of the rod mirror is polished and mainly used for forming light beams of different shapes and reflecting the cut light to the outside of the rod mirror.
As a preferable scheme of the invention, the base is made of stainless steel or other metal materials, the appearance of the base and the number and arrangement form of the mounting holes of the end caps can be designed according to the actual requirements of users, and the length of the base needs to ensure that the focal plane of the rod mirror is positioned at the output end face of the optical fiber or the melting point of the end cap of the optical fiber.
Through the technical scheme, the invention can achieve the following technical effects:
the invention can greatly relieve the contradiction between the high light beam duty ratio and the small array light beam size and realize the compact arrangement of light beams in any shapes.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a sectional view of example 1 of the present invention;
FIG. 2 is a perspective view of embodiment 1 of the present invention;
FIG. 3 is a front view of a rod mirror array in embodiment 1 of the present invention;
FIG. 4 is a sectional view of example 2 of the present invention;
FIG. 5 is a perspective view of embodiment 2 of the present invention;
FIG. 6 is a front view of a rod mirror array in embodiment 2 of the present invention;
FIG. 7 is a sectional view of example 3 of the present invention;
FIG. 8 is a perspective view of embodiment 3 of the present invention;
FIG. 9 is a front view of a rod mirror array in embodiment 3 of the present invention;
FIG. 10 is a side view of a hexagonal rod mirror employed in one embodiment of the present invention;
FIG. 11 is a perspective view of a hexagonal rod mirror employed in one embodiment of the present invention;
FIG. 12 is a drawing of the dimensions of a rod mirror used in one embodiment of the present invention;
FIG. 13 is a cross-sectional view of a base employed in one embodiment of the present invention;
FIG. 14 is a cross-sectional view of a fiber positioner employed in an embodiment of the present invention;
FIG. 15 is a perspective view of the corresponding fiber positioner of FIG. 14;
FIG. 16 is a cross-sectional view of a fiber positioner employed in an embodiment of the present invention;
FIG. 17 is a perspective view of the corresponding fiber positioner of FIG. 16;
the reference numbers in the figures:
1. a rod mirror; 101. a rod mirror first section; 102. a laser light entrance face; 103. a second segment of the rod lens; 104. a laser exit surface; 2. a base; 201. a rod mirror mounting hole; 202. an optical fiber positioning member mounting hole; 203. a first end of the base; 204. a second end of the base; 3. an optical fiber; 301. an optical fiber end cap; 4. an optical fiber positioning member; 401. an adapter; 402. and (4) the ceramic ferrule.
The objects, features and advantages of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are only for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "connected," "secured," and the like are to be construed broadly, and for example, "secured" may be a fixed connection, a removable connection, or an integral part; the connection can be mechanical connection, electrical connection, physical connection or wireless communication connection; they may be directly connected or indirectly connected through intervening media, or they may be interconnected within two elements or in a relationship where two elements interact with each other unless otherwise specifically limited. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In addition, the technical solutions in the embodiments of the present invention may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination of technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
Referring to fig. 1, 2, 3 and 13, the present embodiment provides a rod mirror array device for fiber laser array beam splicing and combining, which includes a rod mirror 1 and a base 2. The number of the rod mirrors 1 is 7, the size and the shape of all the rod mirrors 1 are completely the same, and the rod mirrors are integrally formed by fused quartz glass or other high-transmissivity optical glass or crystal materials.
The optical fiber 3 is fixed at the first end 203 of the base, the first end 203 of the base is provided with an optical fiber positioning member mounting hole 202, the optical fiber positioning member mounting hole 202 is used for mounting the optical fiber positioning member 4, and the optical fiber 3 outputting each unit light beam is respectively mounted in the corresponding optical fiber positioning member 4. The optical fibers 3 outputting the light beams of each unit can be directly output through the end faces of the optical fibers at the tail ends of the optical fibers or can be output through the optical fiber end caps 301 connected to the tail ends of the optical fibers, the optical fibers 3 outputting the light beams of each unit are fixed on the optical fiber positioning pieces in a glue bonding mode, and the optical fiber positioning pieces 4 are fixed in the optical fiber positioning piece mounting holes 202 in a mechanical or bonding mode.
The rod mirrors 1 are mounted one-to-one opposite to the optical fibers 3 at the second end 204 of the base opposite to the first end 203 of the base. The second end 204 of the base is provided with rod mirror mounting holes 201, and each rod mirror 1 is respectively mounted in the corresponding rod mirror mounting hole 201. Each rod lens 1 can be fixed in the corresponding rod lens mounting hole 201 by means of glue bonding. As can be seen from fig. 1, the rod mirror mounting holes 201 are independent from each other, the fiber positioning member mounting holes 202 are also independent from each other, and the rod mirror mounting holes 201 are opposite to and communicate with the fiber positioning member mounting holes 202.
The unit beams to be spliced and synthesized are incident to the rod mirror 1 through the optical fiber 3, the unit beams with corresponding shapes are generated through the rod mirror 1, and the optical fiber laser array beams with corresponding shapes and arrangement are spliced by the rod mirror array and output.
Referring to fig. 1, 4, 7, 10 and 11, the rod mirror 1 used in the present invention is divided into two sections, the first section 101 of the rod mirror extends into the rod mirror mounting hole 201 for mounting the rod mirror 1 on the base 2, and the end surface of the first section 101 of the rod mirror is the laser incident surface 102 of the rod mirror; the second rod mirror section 103 is located outside the base, the end face of the second rod mirror section 103 is a laser emitting face 104 of the rod mirror, the laser incident face 102 and the laser emitting face 104 are used for collimating and shaping the light beam incident into the rod mirror, when the output light beam of the rod mirror is required to be a gaussian light beam, the rod mirror only needs to collimate the light beam incident into the rod mirror, and therefore the laser incident face 104 can be a plane or a spherical surface, and the emitting face is a spherical surface. When the output beam of the rod mirror is required to be a flat-top beam or other forms of beams, the rod mirror needs to collimate and shape the beam incident into the rod mirror at the same time, so that the laser incident surface and the laser exit surface of the rod mirror may be aspheric. And polishing the laser emergent surface and the laser incident surface, and plating an antireflection film for emitting laser wavelength.
The shape and the size of the cross section of the first section 101 of the rod mirror are matched with the shape and the size of the mounting hole 201 of the rod mirror, so that the outer side surface of the first section 101 of the rod mirror can be roughened, and the stable fixation with the mounting hole 201 of the rod mirror is facilitated. The cross section of the second section 103 of the rod mirror is a curved surface with a circular shape, a polygonal shape or other shapes, and the outer side surface of the second section 103 of the rod mirror is polished, so that the second section is mainly used for forming light beams with different shapes and reflecting the intercepted light to the outside of the rod mirror.
Referring to fig. 2, 10 and 11, the rod 1 used is a hexagonal rod having a cross section of a regular hexagon, and the second segment 103 of the rod has a cross section of a regular hexagon. The light beam incident through the laser light incident surface 102 of the rod mirror passes through the hexagonal rod mirror and is output from the laser light emitting surface 104 of the rod mirror, and a unit beam spot having a regular hexagonal cross section can be generated. As shown in fig. 2 and fig. 3, all the rod mirrors 1 are closely arranged without space to form a honeycomb-shaped rod mirror array, which can realize the splicing and synthesis of the honeycomb-shaped array light beams. Thus, the defect that the arrangement shape and the tightness degree of the circular unit beams in the conventional array beam are limited can be overcome. In this embodiment, the number of the rod mirrors is 7, and in practical application, a honeycomb-shaped rod mirror array with more rod mirrors can be arranged according to requirements.
Referring to fig. 1, 2 and 3, all the rod mirrors 1 are closely arranged without space to form a honeycomb-shaped rod mirror array, unit beams to be spliced and synthesized are incident to the rod mirrors 1 through optical fibers 3, unit beams corresponding to the cross section shape of the second segment 103 of the rod mirrors are generated through the rod mirrors 1, and finally the honeycomb-shaped optical fiber laser array beams are spliced and synthesized by the rod mirror array.
According to different application requirements, the rod mirror can be made into a circular rod mirror with a circular cross section or a polygonal rod mirror with other polygonal cross sections. The rod mirrors with different cross section shapes can be used for generating unit beam spots with different shapes, so that optical fiber laser array beams with different shapes are spliced. In addition, the arrangement mode of the rod mirror array is not limited, and various special light spots such as annular light spots and light spots shaped like Chinese character 'hui' can be obtained through the design of the arrangement mode of the rod mirrors in the rod mirror array. For example, referring to fig. 1, 2 and 3, in example 1, a hexagonal rod mirror with a regular hexagonal cross section is used to generate a regular hexagonal light spot and realize the splicing and synthesis of a honeycomb array light beam. Referring to fig. 4, 5 and 6, in example 2, square light spots can be generated and the splicing and combination of square array beams can be realized by using a square-cross-section quadrangular rod mirror. Referring to fig. 7, 8 and 9, in the embodiment 3 provided, a circular rod mirror with a circular cross section is used to generate a circular light spot, so as to implement splicing and combining of circular or ring-shaped array light beams.
Referring to fig. 12, a rod mirror design process is described by way of example of a gaussian beam: when the output light beam of the rod mirror is required to be a Gaussian light beam, the structural parameters of the rod mirror are designed according to the shape and the size of the unit light beam to be output, and the method comprises the following steps:
(1) the light spot of the unit light beam to be output is circular or regular polygon, and the diameter (corresponding to the diameter of the circular rod mirror) or the diameter of the inscribed circle (corresponding to the inscribed circle of the regular polygon rod mirror) is
The percentage of laser energy in the diameter of a light spot or the diameter of an inscribed circle of the unit light beam in the total energy of the unit light beam is P;
(2) calculating or measuring by the existing method to obtain the maximum divergence angle full angle A and the divergence angle full angle B with the energy ratio of P of the unit beams to be spliced and synthesized;
(3) determining the diameter or diameter of the inscribed circle of the second section of the rod lens
(4) The first section of the rod mirror has a circular cross section and a diameter D2Length of L2The size and shape of the first section of the rod mirror can ensure that the rod mirror can be stably installed on the base. The first section of the rod lens is primarily for mounting the rod lens on the base, and therefore is primarily considered to be a reasonable dimension for the base support structure, e.g. diameter D of the first section of the rod lens2Second segment D of rod mirror11mm small, the length L of the first section of the rod mirror2Is 3-5 mm.
(5) The distance between the rod mirror and the output end face of the optical fiber is L3According to the formula F ═ L1+L2+L3And formula
Determine focal length F and distance L of rod lens simultaneously3Wherein beta is the divergence angle full angle of the light beam with the divergence angle full angle B after entering the rod mirror, can be represented by
Obtaining n is the refractive index of the rod mirror material at the laser emission wavelength band;
(6) further, in order to allow the laser light incident on the rod mirror to be output entirely through the rod mirror, it is required to satisfy
Wherein alpha is the divergence angle full angle of the light beam after the light beam with divergence angle full angle A enters the rod mirror, and can be represented by formula
And (6) obtaining.
Referring to fig. 1, 4, 7 and 13, the base 2 of the present invention is made of stainless steel or other metal material, the shape of the base and the number and arrangement of the mounting holes of the end cap can be designed according to the actual requirements of the user, and the length of the base is required to ensure that the focal plane of the rod mirror is located at the output end face of the optical fiber or the optical fiber end cap. The shape of the base and the number and arrangement of the end cap mounting holes can be designed according to the actual requirements of users. The base 2 is mainly used for providing mounting support for the rod lens 1 and the optical fiber positioning piece 4. The base first end 203 is provided with a fiber positioning member mounting hole 202 and the base second end 204, opposite the base first end 203, is provided with a rod lens mounting hole 201. The rod mirror mounting hole 201 is used for installing a rod mirror, and the first rod mirror section 101 is installed in the rod mirror mounting hole 201 of the base; the fiber positioning member mounting holes 202 are used for mounting the fiber positioning members 4. After the rod mirrors and the optical fiber positioning members are installed, the focal plane of each rod mirror is required to be located at the output end face of the corresponding optical fiber or the melting point of the optical fiber end cap. This is indeed a requirement for the base 2 to be of a length that ensures that the focal plane of the rod mirror is located at the output end face of the fibre.
The optical fiber positioning member 4 is used for positioning and installing the optical fiber or the optical fiber end cap, and if the unit light beam is directly output through the optical fiber, the structure of the optical fiber positioning member is shown with reference to fig. 14 and 15. If the unit beam is output through the fiber end cap, the structure of the fiber positioning member is as shown in fig. 16 and 17. The following are introduced separately:
the structure of the optical fiber positioning member when the optical fiber is directly output is shown in fig. 14 and fig. 15, the optical fiber positioning member is composed of an adaptor 401 and a ferrule 402, the ferrule 402 is sleeved in the adaptor 401, and a penetration through hole for inserting the optical fiber 3 is formed in the ferrule 402. The ceramic ferrule 401 is a commercial finished device, the adaptor 401 is made of metal material, and all the devices are connected in a glue bonding mode. The ferrule 402 is mainly easy to fix the optical fiber 3, and the output end face of the optical fiber 3 is flush with the end face of the ferrule; the adaptor is mainly used for three-dimensional positioning of the optical fiber end face, optical axis inclination deviation caused by mechanical error can be compensated by adjusting the position of the adaptor in a plane perpendicular to the optical axis in the optical fiber positioning piece mounting hole, and the optical fiber end face can be accurately positioned on a focal plane of the rod mirror by adjusting the axial positions of the adaptor and the ceramic ferrule.
As shown in fig. 16 and 17, the optical fiber positioning element includes an adaptor 401, and the adaptor 401 has a through hole for inserting the optical fiber end cap 301 at the end of the optical fiber 3. Optical fiber end cap 301 and optic fibre 3 all adopt commercial finished product device, and adaptor 401 adopts metal material to process and forms, adopts the butt fusion mode to be connected between optical fiber end cap 301 and the optic fibre 3, adopts glue bonding mode to be connected between optical fiber end cap 301 and the adaptor 401.
In summary, although the present invention has been described with reference to the preferred embodiments, it should be understood that various changes and modifications can be made by those skilled in the art without departing from the spirit and scope of the invention.
Claims (10)
1. A rod mirror array device for optical fiber laser array beam concatenation is synthetic, its characterized in that: the optical fiber laser array comprises rod mirrors and a base, wherein optical fibers or optical fiber end caps are fixed at the first end of the base, rod mirrors which are one-to-one opposite to the optical fibers or the optical fiber end caps are installed at the second end of the base opposite to the first end of the base, all the rod mirrors are arranged into a rod mirror array in a set mode, unit light beams to be spliced and synthesized are incident to the rod mirrors through the optical fibers or the optical fiber end caps and generate unit light beams with corresponding shapes through the rod mirrors, the rod mirrors with different cross section shapes can generate unit light beam spots with different shapes, and therefore the rod mirrors are spliced into different shapes through the rod mirror array and output the distributed optical fiber laser array light beams.
2. The rod mirror array apparatus for fiber laser array beam splicing synthesis of claim 1, wherein: the first end of base is provided with optic fibre setting element mounting hole, and optic fibre setting element mounting hole is used for installing the optic fibre setting element, and the output optic fibre of each unit light beam or optic fibre end cap are installed respectively in corresponding optic fibre setting element.
3. The rod mirror array device for fiber laser array beam splicing synthesis according to claim 2, wherein: the second end of base is provided with the rod mirror mounting hole, and the rod mirror mounting hole is relative and communicate with each other with optic fibre setting element mounting hole one-to-one, and each rod mirror is installed respectively in the rod mirror mounting hole that corresponds, and the focal plane of each rod mirror is located the output terminal surface department of corresponding optic fibre or the melting point department of optic fibre end cap.
4. The rod mirror array apparatus for fiber laser array beam splicing synthesis of claim 1, 2 or 3, wherein: the rod mirror is a circular rod mirror with a circular cross section or a polygonal rod mirror with a polygonal cross section, and circular or polygonal unit light beam spots are generated through the rod mirror.
5. The rod mirror array apparatus for fiber laser array beam splicing synthesis of claim 4, wherein: the rod mirrors are hexagonal rod mirrors with regular hexagonal cross sections, regular hexagonal unit beam light spots are generated through the hexagonal rod mirrors, all the rod mirrors are closely arranged without intervals to form a honeycomb rod mirror array, and splicing and synthesis of honeycomb array beams can be achieved.
6. The rod mirror array apparatus for fiber laser array beam splicing synthesis of claim 4, wherein: the rod lenses are square rod lenses with square cross sections, square unit light beam light spots are generated through the four-edge rod lenses, all the rod lenses are closely arranged in a non-interval mode to form a square rod lens array, and splicing and synthesis of square array light beams can be achieved.
7. The rod mirror array device for fiber laser array beam splicing synthesis according to claim 4, wherein: the rod mirror is of an integrally formed integral structure made of high-transmissivity optical glass or crystal materials.
8. The rod mirror array apparatus for fiber laser array beam splicing synthesis of claim 7, wherein: the rod mirror is divided into two sections, a first section of the rod mirror extends into the rod mirror mounting hole and is used for mounting the rod mirror on the base, and the end face of the first section of the rod mirror is a laser surface of the rod mirror; the second section of the rod mirror is positioned outside the base, the end face of the second section of the rod mirror is a laser emergent face of the rod mirror, the laser incident face and the laser emergent face are used for collimating or/and shaping light beams incident into the rod mirror, the laser emergent face and the laser incident face are subjected to polishing treatment, and an antireflection film of incident laser wavelength is plated.
9. The rod mirror array apparatus for fiber laser array beam splicing synthesis of claim 8, wherein: when the unit beam output by the rod mirror is required to be a Gaussian beam, the laser incidence surface is a plane or a spherical surface, the laser emergence surface is a spherical surface, and the structural parameters of the rod mirror are designed according to the shape and the size of the unit beam output by the rod mirror, wherein the method comprises the following steps:
given the design requirements: the facula of the unit light beam output by the rod mirror is circular or regular polygon, and the diameter or the diameter of the inscribed circle is
The percentage of laser energy in the diameter of a light spot or the diameter of an inscribed circle of a unit light beam output by the rod mirror in the total energy of the unit light beam is P;
acquiring a maximum divergence angle full angle A and a divergence angle full angle B with energy ratio of P of unit beams to be spliced and synthesized;
determining the diameter or diameter of the inscribed circle of the second section of the rod lens
The first section of the rod mirror has a circular cross section and a diameter D2Length of L2The size and shape of the first section of the rod mirror ensure that the rod mirror can be stably arranged on the base;
the distance between the rod mirror and the output end face of the optical fiber is L3According to the formula F ═ L1+L2+L3And formula
Simultaneously determining the focal length F and the distance L of the rod lens3Wherein beta is the divergence angle full angle of the light beam after the light beam with the divergence angle full angle B enters the rod mirror
To find, n is the refractive index of the rod mirror material at the emitted laser wavelength band.
10. The rod mirror array apparatus for fiber laser array beam splicing synthesis of claim 9, wherein: in order to output the laser light incident on the rod mirror through the rod mirror, it is required to satisfy
Wherein alpha is the full angle of divergence of the light beam after the light beam with the full angle of divergence A enters the rod mirror
And (6) obtaining.
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