CN221080627U

CN221080627U - Laser beam combining device based on bidirectional beam shaping

Info

Publication number: CN221080627U
Application number: CN202320479015.5U
Authority: CN
Inventors: 周益良; 黄卓辉
Original assignee: Guangdong Yicai Optoelectronic Technology Co ltd
Current assignee: Guangdong Yicai Optoelectronic Technology Co ltd
Priority date: 2023-03-13
Filing date: 2023-03-13
Publication date: 2024-06-04
Anticipated expiration: 2033-03-13

Abstract

The utility model discloses a laser beam combining device based on bidirectional beam shaping, which comprises a first laser, a second laser, a third laser, a fourth laser, a first beam combining lens group, a second beam combining lens group, a first shaping lens group, a second shaping lens group, a third beam combining lens group, a lens, a base and a cover plate. The lens is arranged at the front end of the base, and the first laser, the second laser, the third laser and the fourth laser are respectively arranged at the left side and the right side of the base far away from the lens. The beam combiner group is used for combining the laser beam emitted by the laser into a laser beam, and the shaping lens group is used for shaping the laser beam into a beam collimated by a fast axis and a slow axis. Under the condition of not modifying the original TO packaged laser diode, the utility model realizes the shaping and beam combination of four laser diodes, the beam characteristics can reach the level of modifying TO, and the reliability of the laser device is greatly improved because the original state of TO is maintained.

Description

Laser beam combining device based on bidirectional beam shaping

Technical Field

The utility model relates to the technical field of laser engraving, in particular to a laser beam combining device based on bidirectional beam shaping.

Background

Along with the continuous development of science and technology, the development and the application of laser in the engraving field are promoted, and compared with a traditional engraving module adopting a traditional engraving tool, the laser engraving module based on laser effectively improves the engraving efficiency. At present, the existing laser engraving modules are mainly divided into two types: one type adopts a single-path laser design, the laser engraving module is only provided with one laser, the output laser power is limited greatly, the engraving requirement range can be met is small, and the universality is poor; another type uses laser beam combining.

At present, the mode of carving laser beam combination is mainly divided into two modes:

(1) Polarization beam combination is adopted: the laser light source typically emits linearly polarized light, which is divided into P-polarization and S-polarization. The polarization beam combining technology combines two lasers with opposite polarization states by using a wave plate and a polaroid (or called a polarization beam combiner PBS). The polarization beam combining laser can realize almost complete superposition of light beams, and the output energy of the laser is doubled under the condition of not increasing the size of a light spot. However, polarization beam combination can only achieve laser 2 and 1, and cannot achieve beam combination of 3 light sources or more.

(2) By adopting a multi-path reflection space design, the light path can realize the combination of 3 light sources and more, and the mode closely arranges a plurality of narrow lasers to enable the parallel beams output by the laser to approximate to one laser, the output power of the laser is in direct proportion to the number of the laser diode light sources, but because the light beams are not completely overlapped, the light spot size is larger, and the engraving precision of the polarization combination type laser cannot be achieved.

Meanwhile, the light emission characteristic of the laser diode is that the divergence angle difference between the fast axis and the slow axis is large, and the focused light beam is generally elliptical, so that the fast axis and the slow axis are required to be collimated by a beam shaping technology, the divergence angles of the fast axis and the slow axis are approximately consistent, and a focused light spot is approximately square.

The existing engraving laser beam shaping technology mainly comprises two types:

(1) Fac+sac scheme: the two convex cylindrical lenses with the vertical main axes are used for carrying out bidirectional shaping on laser beams, the convex cylindrical lenses with the collimation fast axes are FAC, and the convex cylindrical lenses with the collimation slow axes are SAC, so that the collimation of light diverged in the two vertical directions can be realized. However, the FAC needs TO be closely attached TO the laser light emitting chip TO achieve a better effect, however, in the TO package of the laser diode, the light emitting chip is protected inside by the protection window, so that the protection window needs TO be removed TO closely attach the FAC TO the light outlet of the light emitting chip. The operation of dismantling the protection window has extremely high risk of light source failure, the requirements of the laser diode light emitting chip on the packaging environment and packaging measures are very strict, and the laser adopting the shaping technology has extremely high technical threshold of preparation and high production cost.

The protection window is removed, the FAC is closely attached TO the laser light-emitting chip, and the laser device assembled by the process is low in reliability, because the light-emitting chip is exposed in the air after the window is opened, and the service life of the light-emitting chip is possibly shortened due TO the influence of oxygen, temperature and dust particles.

(2) Convex lens + plano-concave cylindrical lens + plano-convex cylindrical lens solution: the divergence angles of the fast axis and the slow axis are calibrated to be within 2 degrees by adopting the convex lens, at the moment, the divergence angles of the fast axis and the slow axis are still different but have small difference, and then the divergence angles of the slow axis direction are corrected and adjusted by matching with the plane convex cylindrical lens and the plane concave cylindrical lens, so that the divergence angles are close to the divergence angles of the fast axis, and the focused rear square light spots can be realized. Some TO packaged laser diodes are built in convex lenses, so the optical path appears TO be a combination of a laser diode with a plano-concave cylindrical lens and a plano-convex cylindrical lens. The beam shaping technology is one-way shaping, and has the defects that the beam is wider, the tight arrangement of two laser beams cannot be realized, so that the spatial beam combination is realized, and the depth of field of the wide beam after being converged by a focusing lens is shorter.

Disclosure of utility model

Aiming at the defects of the prior art, the utility model aims TO provide a laser beam combining device based on bidirectional beam shaping, which realizes the shaping and beam combining of four laser diodes under the condition of not modifying the original TO packaged laser diode, the beam characteristics can reach the level of modifying TO, and the reliability of the laser device is greatly improved because the original state of TO is maintained.

The aim of the utility model is achieved by the following technical scheme:

The laser beam combining device based on the bidirectional beam shaping comprises a first laser, a second laser, a third laser, a fourth laser, a first beam combining lens group, a second beam combining lens group, a first shaping lens group, a second shaping lens group, a third beam combining lens group, a lens and a base;

the lens is arranged at the front end of the base;

The first laser and the second laser are arranged on the left side of the base in a horizontal arrangement relation away from the lens;

the third laser and the fourth laser are arranged on the right side of the base in a horizontal arrangement relation away from the lens;

the first light converging lens and the first shaping lens group are sequentially arranged on the base along the light path propagation direction of the first laser; the second light converging lens group and the second shaping lens group are sequentially arranged on the base along the light path propagation direction of the third laser.

Further, the first light combining lens group comprises a first half-wave plate, a first reflecting mirror and a first polarizing plate, and is used for combining two laser beams projected by the first laser and the second laser into a first laser beam;

the second light combining lens group comprises a second half wave plate, a second reflecting mirror and a second polarizing plate, and is used for combining two laser beams projected by the third laser and the fourth laser into a second laser beam;

The first shaping lens group comprises a first plano-convex cylindrical lens, a first plano-concave cylindrical lens, a second plano-concave cylindrical lens and a second plano-convex cylindrical lens, and is used for shaping the first laser beam into a beam collimated by a fast axis and a slow axis;

The second shaping lens group comprises a third plano-convex cylindrical lens, a third plano-concave cylindrical lens, a fourth plano-concave cylindrical lens and a fourth plano-convex cylindrical lens, and is used for shaping the second laser beam into a beam collimated by a fast axis and a slow axis;

The third light combining lens group comprises a third reflecting mirror and a fourth reflecting mirror, and is used for combining the shaped first laser beam and the shaped second laser beam into one laser beam;

The first half wave plate, the first reflecting mirror, the first polaroid, the first plano-convex cylindrical lens, the first plano-concave cylindrical lens, the second plano-convex cylindrical lens and the third reflecting mirror are sequentially arranged on the base along the light path propagation direction of the first laser;

The second half wave plate, the second reflecting mirror, the second polarizing plate, the third plano-convex cylindrical lens, the third plano-concave cylindrical lens, the fourth plano-convex cylindrical lens and the fourth reflecting mirror are sequentially arranged on the base along the light path propagation direction of the third laser.

Further, the method comprises the steps of,

The first half wave plate is arranged right in front of the first laser, and the first reflecting mirror and the first laser are arranged at an oblique angle of 45 degrees in front of the light emitting side of the first laser and correspond to the light path propagation direction of the first laser; the first half wave plate changes the polarization state of the laser emitted by the first laser from the S polarization state to the P polarization state, and the first reflecting mirror horizontally deflects the laser beam projected by the first laser by 90 degrees so as to realize beam combination with the laser beam emitted by the second laser at the first polarizing plate;

The second half-wave plate is arranged right in front of the third laser, and the second reflecting mirror and the third laser are arranged at an oblique angle of 45 degrees in front of the light emitting side of the third laser and correspond to the light path propagation direction of the third laser; the second half wave plate enables the polarization state of laser emitted by the third laser to be changed from the S polarization state to the P polarization state, and the second reflecting mirror horizontally deflects the laser beam projected by the third laser by 90 degrees so that the laser beam emitted by the second half wave plate and the laser beam emitted by the fourth laser are combined at the second polarizing plate.

Further, the method comprises the steps of,

The first polaroid and the second laser are arranged at the front of the light emitting side of the second laser in a 45-degree oblique angle arrangement mode and correspond to the light path propagation direction of the first laser;

The second polaroid and the fourth laser are arranged at the front of the light emitting side of the fourth laser in a 45-degree oblique angle arrangement mode and correspond to the light path propagation direction of the third laser.

Further, the method comprises the steps of,

The first plano-convex cylindrical lens and the second plano-concave cylindrical lens are matched to shape the first laser beam into a fast axis collimated beam; the first plano-concave cylindrical lens and the second plano-convex cylindrical lens are matched to shape the first laser beam into a slow-axis collimated beam; the third plano-convex cylindrical lens and the fourth plano-concave cylindrical lens are matched to shape the second laser beam into a beam collimated by a fast axis;

The third plano-concave cylindrical lens and the fourth plano-convex cylindrical lens cooperate to shape the second laser beam into a slow-axis collimated beam.

Further, the method comprises the steps of,

The lens is connected with the base through threads, and a sealing ring is further arranged at the joint of the lens and the base; the lens comprises a lens barrel, a lens seat, a focusing lens, a protective cover and a protective flat window, wherein the focusing lens is fixed in an inner cavity of the lens seat through optical glue in a bonding mode, the lens seat is connected in the lens barrel through threads, the protective cover is arranged at the front end of the focusing lens, and the protective flat window is arranged in the protective cover.

Further, the first laser, the second laser, the third laser and the fourth laser are laser diodes, the laser diodes are installed on the base through screw caps, and a PCB is further arranged at the joint of the laser diodes and the base.

Further, the laser beam combining device is further provided with a cover plate, and the cover plate is fixed on the base through screws.

Further, in an embodiment of the present utility model, the lens is disposed at a front end of the base along a light path propagation direction of the third laser, and the third reflecting mirror is disposed in front of a light emitting side of the second plano-convex cylindrical lens and corresponds to the light path propagation direction of the first laser in a manner of being arranged at an oblique angle of 45 ° with respect to the first laser; the fourth reflecting mirror and the third laser are arranged at an oblique angle of 45 degrees at the same time, are arranged in front of the light emitting side of the fourth plano-convex cylindrical lens and correspond to the light path propagation direction of the third laser.

Further, in other embodiments of the present utility model, the lens is disposed at a front end of the base along a light path propagation direction of the first laser, and the third reflecting mirror and the first laser are disposed in front of a light emitting side of the second plano-convex cylindrical lens in a 135 ° oblique angle arrangement manner and corresponds to the light path propagation direction of the first laser; the fourth reflecting mirror and the third laser are arranged at 135-degree oblique angles at the same time and are arranged in front of the light emitting side of the fourth plano-convex cylindrical lens and correspond to the light path propagation direction of the third laser.

The beneficial effects of the utility model are as follows:

1. The protection window is removed, the FAC is closely attached TO the laser light-emitting chip, and the laser device assembled by the process is low in reliability, because the light-emitting chip is exposed in the air after the window is opened, and the service life of the light-emitting chip is possibly shortened due TO the influence of oxygen, temperature and dust particles. Under the condition of not modifying the original TO packaged laser diode, the utility model realizes the shaping and beam combination of 4 LDs, the beam characteristics can reach the level of modifying TO, and the reliability of the laser device is greatly improved because the original state of TO is maintained.

2. The utility model adopts the method of combining beams by polarization and then combining beams spatially, reduces the number of shaping lenses and simultaneously compresses the whole size of the laser device.

3. The utility model adopts the bidirectional beam shaping technology, and controls the collimation degree of the fast axis and the slow axis more accurately. The cylindrical lenses in the utility model are both flat convex cylindrical lenses and flat concave cylindrical lenses with smaller curvature, and the production difficulty is much lower than that of FAC with very large curvature in the FAC+SAC scheme, so that the yield and productivity of the lenses can be improved, and the unit cost of the cylindrical lenses is greatly reduced.

4. The utility model adopts the light paths which are arranged in a staggered way, so that the optical elements are not interfered in a staggered way, the arrangement integration level of the optical elements is improved, and the overall size of the laser device is compressed.

Drawings

FIG. 1 is a schematic overall structure of a first embodiment of the present utility model;

FIG. 2 is a schematic diagram of an explosion structure of a first embodiment of the present utility model;

FIG. 3 is a schematic view showing the internal structure of a first embodiment of the present utility model;

FIG. 4 is a schematic view of the optical path principle of the first embodiment of the present utility model;

FIG. 5 is a schematic diagram of an optical element arrangement according to a second embodiment of the present utility model;

Reference numerals: 11-first laser, 12-second laser, 13-first combiner set, 14-first shaper set, 21-third laser, 22-fourth laser, 23-second combiner set, 24-second shaper set, 30-third combiner set, 40-lens, 50-base, 60-sealing ring, 70-cover plate, 80-PCB, 90-screw gland, 131-first half-wave plate, 132-first mirror, 133-first polarizer, 141-first plano-convex lens, 142-first plano-concave lens, 143-second plano-concave lens, 144-second plano-convex lens, 231-second half-wave plate, 232-second mirror, 233-second polarizer, 241-third plano-convex lens, 242-third plano-concave lens, 243-fourth plano-concave lens, 244-fourth plano-convex lens, 301-third mirror, 302-fourth mirror, 401-402-convex lens holder, 403-concave lens holder, 404-convex lens holder, 405-convex lens holder.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "vertical direction", "upper", "lower", "horizontal", "left", "right", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or element to be referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," "third," "fourth," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present utility model, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, integrally connected, mechanically connected, electrically connected, directly connected, connected via an intermediary, or connected by communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

Referring to fig. 1 to 4, a laser beam combining device based on bidirectional beam shaping according to a first embodiment of the present utility model includes a first laser 11, a second laser 12, a third laser 21, a fourth laser 22, a first beam combining lens set 13, a second beam combining lens set 23, a first shaping lens set 14, a second shaping lens set 24, a third beam combining lens set 30, a lens 40, a base 50, and a cover plate 70. The lens 40 is arranged at the front end of the base 50, and the first laser 11 and the second laser 12 are arranged at the left side of the base 50 in a horizontal arrangement manner away from the lens 40; the third laser 21 and the fourth laser 22 are disposed in a horizontally arranged relationship away from the lens 40 on the right side of the base 50. The laser beam combining device is further provided with a cover plate 70, and the cover plate 70 is fixed on the base 50 through screws.

The first laser 11, the second laser 12, the third laser 21 and the fourth laser 22 are laser diodes, the base 50 is provided with mounting holes for mounting the screw gland 90, and the laser diodes are mounted on the base 50 through the screw gland 90. The connection between the laser diode and the base 50 is also provided with a PCB 80, and the PCB 80 contains circuits and is electrified to light the laser diode. In a specific application, the mounting hole is provided with a limit structure, and a limit groove designed by matching with the characteristics of the laser diode TO packaging shell is arranged on the mounting hole, so that the laser diode is mounted in the base 50 in a specified direction. The material of the base 50 may be aluminum or copper, or other materials with high thermal conductivity, which can serve as both heat dissipation and mounting elements. The laser diode and the optical element are mounted in specified positions. When the laser diode works, a large amount of heat released by the laser diode is conducted into the base 50, the base 50 is connected with an external heat dissipation device, and the heat energy is discharged by adopting an air cooling or water cooling system.

The lens 40 is connected with the base 50 through threads, and a sealing ring 60 is further arranged at the joint of the lens 40 and the base 50. The lens 40 includes a lens barrel 401, a lens holder 402, a focus lens 403, a protective cover 404, and a protective window 405. The focusing lens 403 is fixed in the inner cavity of the threaded lens holder 402 by optical glue, and the focusing lens 403 converges the shaped beam collimated laser into a fine light spot. The lens holder 402 is screwed into the lens barrel 401, and the focus lens 403 is mounted in the lens barrel 401 by screwing in, while adjusting the relative position of the focus lens 403 in the lens barrel 401. The protection cover 404 is arranged at the front end of the focusing lens 403, and the protection flat window 405 is installed in the protection cover 404 to realize sealing and dust prevention.

The first light combining lens group 13 includes a first half-wave plate 131, a first reflecting mirror 132, and a first polarizing plate 133, and the first light combining lens group 13 is configured to combine two laser light beams projected from the first laser 11 and the second laser 12 into a first laser light beam.

The half-wave plate optically acts to convert the laser light from the P-polarization state to the S-polarization state, or from the S-polarization state to the P-polarization state.

The first half-wave plate 131 is disposed right in front of the first laser 11, and the first half-wave plate 131 changes the polarization state of the laser beam emitted from the first laser 11 from the S polarization state to the P polarization state, so that the first half-wave plate and the laser beam emitted from the second laser 12 are combined at the first polarizer 133, and the first polarizer 133 can also transmit the P polarization state and reflect the S polarization state, thereby combining the laser beams with the same wavelength and different polarization states.

The first reflecting mirror 132 is arranged in front of the light emitting side of the first laser 11 in a 45-degree oblique angle arrangement manner with the first laser 11 and corresponds to the light path propagation direction of the first laser 11, and the first reflecting mirror 132 deflects the laser beam projected by the first laser 11 horizontally by 90 degrees so that the laser beam emitted by the second laser 12 and the laser beam emitted by the second laser achieve beam combination at the first polarizer 133.

The first polarizing plate 133 and the second laser 12 are arranged at an oblique angle of 45 degrees in front of the light emitting side of the second laser 12 and correspond to the light path propagation direction of the first laser 11, so that the laser beams emitted by the first laser 11 and the second laser 12 are completely overlapped to form a first laser beam, the spot size is unchanged, and the laser energy is doubled.

The first shaping lens set 14 includes a first plano-convex cylindrical lens 141, a first plano-concave cylindrical lens 142, a second plano-concave cylindrical lens 143, and a second plano-convex cylindrical lens 144, and the first shaping lens set 14 is configured to shape the first laser beam into a light spot with the same divergence angle and the same speed axis. The first plano-convex cylindrical lens 141 and the second plano-concave cylindrical lens 143 cooperate to shape the first laser beam into a beam collimated by the fast axis, specifically, to shape the fast axis direction (i.e., the beam X direction) and to narrow the wide beam into a fine collimated beam; the first plano-concave cylindrical lens 142 and the second plano-convex cylindrical lens 144 cooperate to shape the first laser beam into a slow-axis collimated beam, specifically, to shape the slow-axis direction (i.e., the beam Y direction) and shape the divergent beam into a collimated beam.

The second light combining lens group 23 includes a second half-wave plate 231, a second reflecting mirror 232, and a second polarizing plate 233, and the second light combining lens group 23 is configured to combine the two laser light beams projected from the third laser 21 and the fourth laser 22 into a second laser light beam.

The second half-wave plate 231 is disposed right in front of the third laser 21, and the second half-wave plate 231 changes the polarization state of the laser beam emitted from the third laser 21 from the S polarization state to the P polarization state, so that the laser beam emitted from the fourth laser 22 and the laser beam emitted from the fourth laser 22 are combined at the second polarizer 233, and the second polarizer 233 can also transmit the P polarization state and reflect the S polarization state, thereby combining the laser beams with the same wavelength and different polarization states.

The second reflecting mirror 232 is arranged in front of the light emitting side of the third laser 21 in a 45-degree oblique angle arrangement mode with the third laser 21 and corresponds to the light path propagation direction of the third laser 21, and the second reflecting mirror 232 horizontally deflects the laser beam projected by the third laser 21 by 90 degrees so that the laser beam and the laser beam emitted by the fourth laser 22 are combined at the second polarizer 233.

The second polarizer 233 and the fourth laser 22 are arranged at an oblique angle of 45 degrees in front of the light emitting side of the fourth laser 22 and correspond to the light path propagation direction of the third laser 21, so that the laser beams emitted by the third laser 21 and the fourth laser 22 are completely overlapped to form a second laser beam, the spot size is unchanged, and the laser energy is doubled.

The second shaping lens set 24 includes a third plano-convex cylindrical lens 241, a third plano-concave cylindrical lens 242, a fourth plano-concave cylindrical lens 243, and a fourth plano-convex cylindrical lens 244, and the second shaping lens set 24 is configured to shape the second laser beam into spots with the same divergence angle and the same speed axis. The third plano-convex cylindrical lens 241 and the fourth plano-concave cylindrical lens 243 cooperate to shape the second laser beam into a beam collimated by the fast axis, specifically, to shape the fast axis direction (i.e., the beam X direction) and to narrow the wide beam into a fine collimated beam; the third plano-concave cylindrical lens 242 and the fourth plano-convex cylindrical lens 244 cooperate to shape the second laser beam into a slow-axis collimated beam, specifically, to shape the slow-axis direction (i.e., the beam Y direction) and shape the divergent beam into a collimated beam.

The third light combining lens set 30 comprises a third reflecting mirror 301 and a fourth reflecting mirror 302, wherein the third reflecting mirror 301 and the first laser 11 are arranged at an oblique angle of 45 degrees in front of the light emitting side of the second plano-convex cylindrical lens 144 and correspond to the light path propagation direction of the first laser 11; the fourth reflecting mirror 302 and the third laser 21 are arranged at an oblique angle of 45 ° at the same time, and are disposed in front of the light emitting side of the fourth plano-convex cylindrical lens 244 and correspond to the propagation direction of the optical path of the third laser 21.

The third light combining lens group 30 is used for combining the shaped first laser beam and the shaped second laser beam into one laser beam; wherein: the third mirror 301 performs primary reflection to horizontally deflect the shaped first laser beam by 90 degrees, and the fourth mirror 302 performs secondary reflection to arrange the two laser beams into a composite beam close to 0 pitch, so that the laser energy density reaches the maximum value.

In this embodiment, the first half-wave plate 131, the first reflecting mirror 132, the first polarizing plate 133, the first plano-convex cylindrical lens 141, the first plano-concave cylindrical lens 142, the second plano-concave cylindrical lens 143, the second plano-convex cylindrical lens 144 and the third reflecting mirror 301 are sequentially disposed on the base 50 along the light path propagation direction of the first laser 11, and are adhered to the base 50 by dedicated optical glue.

In this embodiment, the second half-wave plate 231, the second reflecting mirror 232, the second polarizing plate 233, the third plano-convex cylindrical lens 241, the third plano-concave cylindrical lens 242, the fourth plano-concave cylindrical lens 243, the fourth plano-convex cylindrical lens 244, the fourth reflecting mirror 302 and the lens 40 are sequentially disposed on the base 50 along the optical path propagation direction of the third laser 21, and are adhered to the base 50 by special optical glue.

Referring to fig. 5, a second embodiment of the present utility model is shown, which differs from the first embodiment in that:

The lens 40 is arranged at the front end of the base 50 along the light path propagation direction of the first laser 11, and the third reflector 301 is arranged in front of the light emitting side of the second plano-convex cylindrical lens 144 in a 135-degree oblique angle arrangement with the first laser 11 and corresponds to the light path propagation direction of the first laser 11; the fourth reflecting mirror 302 and the third laser 21 are arranged at an oblique angle of 135 ° at the same time, and are disposed in front of the light emitting side of the fourth plano-convex cylindrical lens 244 and correspond to the propagation direction of the optical path of the third laser 21. The third light combining lens group 30 is used for combining the shaped first laser beam and the shaped second laser beam into one laser beam; wherein: the fourth mirror 302 performs primary reflection to horizontally deflect the shaped second laser beam by 90 degrees, and the third mirror 301 performs secondary reflection to arrange the two laser beams into a composite beam close to 0 pitch, so that the laser energy density reaches the maximum value.

Under the condition of not modifying the original TO packaged laser diode, the utility model realizes the shaping and beam combination of four laser diodes, the beam characteristics can reach the level of modifying TO, and the reliability of the laser device is greatly improved because the original state of TO is maintained. The method of combining the beams by polarization and then combining the beams spatially is adopted, so that the number of shaping lenses is reduced, and the whole size of the laser device is also compressed. By adopting the bidirectional beam shaping technology, the collimation degree of the fast axis and the slow axis is controlled more accurately. The cylindrical lenses are both flat convex cylindrical lenses and flat concave cylindrical lenses with smaller curvature, the manufacturing difficulty is much lower than that of FAC with very large curvature in the FAC+SAC scheme, the yield and productivity of the lenses can be improved, and the unit cost of the cylindrical lenses is greatly reduced. The utility model adopts the light paths which are arranged in a staggered way, so that the optical elements are not interfered in a staggered way, the arrangement integration level of the optical elements is improved, and the overall size of the laser device is compressed.

The foregoing description of the preferred embodiments of the utility model has been presented only in a specific and detailed description, and is not to be construed as limiting the scope of the utility model. It should be noted that modifications and improvements can be made by those skilled in the art without departing from the spirit of the utility model, and the utility model is intended to encompass such modifications and improvements.

Claims

1. The utility model provides a laser beam combining device based on two-way beam shaping which characterized in that: the laser comprises a first laser, a second laser, a third laser, a fourth laser, a first light combining lens group, a second light combining lens group, a first shaping lens group, a second shaping lens group, a third light combining lens group, a lens and a base;

the lens is arranged at the front end of the base;

2. The laser beam combining device based on bidirectional beam shaping as set forth in claim 1, wherein:

The first light combining lens group comprises a first half wave plate, a first reflecting mirror and a first polarizing plate, and is used for combining two laser beams projected by the first laser and the second laser into a first laser beam;

3. The laser beam combining device based on bidirectional beam shaping as set forth in claim 2, wherein: the first half wave plate is arranged right in front of the first laser, and the first reflecting mirror and the first laser are arranged at an oblique angle of 45 degrees in front of the light emitting side of the first laser and correspond to the light path propagation direction of the first laser; the first half wave plate changes the polarization state of the laser emitted by the first laser from the S polarization state to the P polarization state, and the first reflecting mirror horizontally deflects the laser beam projected by the first laser by 90 degrees so as to realize beam combination with the laser beam emitted by the second laser at the first polarizing plate;

4. A laser beam combining device based on bi-directional beam shaping as claimed in claim 3, wherein: the first polaroid and the second laser are arranged at the front of the light emitting side of the second laser in a 45-degree oblique angle arrangement mode and correspond to the light path propagation direction of the first laser;

5. The laser beam combining device based on bidirectional beam shaping as set forth in claim 2, wherein: the first plano-convex cylindrical lens and the second plano-concave cylindrical lens are matched to shape the first laser beam into a fast axis collimated beam;

the first plano-concave cylindrical lens and the second plano-convex cylindrical lens are matched to shape the first laser beam into a slow-axis collimated beam;

The third plano-convex cylindrical lens and the fourth plano-concave cylindrical lens are matched to shape the second laser beam into a beam collimated by a fast axis;

6. The laser beam combining device based on bidirectional beam shaping as set forth in claim 1, wherein: the lens is connected with the base through threads, and a sealing ring is further arranged at the joint of the lens and the base; the lens comprises a lens barrel, a lens seat, a focusing lens, a protective cover and a protective flat window, wherein the focusing lens is fixed in an inner cavity of the lens seat through optical glue in a bonding mode, the lens seat is connected in the lens barrel through threads, the protective cover is arranged at the front end of the focusing lens, and the protective flat window is arranged in the protective cover.

7. The laser beam combining device based on bidirectional beam shaping as set forth in claim 1, wherein: the first laser, the second laser, the third laser and the fourth laser are laser diodes, the laser diodes are installed on the base through screw gland, and a PCB board is further arranged at the joint of the laser diodes and the base.

8. The laser beam combining device based on bidirectional beam shaping as set forth in claim 1, wherein: the laser beam combining device is further provided with a cover plate, and the cover plate is fixed on the base through screws.

9. The laser beam combining device based on bidirectional beam shaping as set forth in claim 2, wherein: the lens is arranged at the front end of the base along the light path propagation direction of the third laser, and the third reflecting mirror and the first laser are arranged at the front of the light emitting side of the second plano-convex cylindrical lens in a 45-degree oblique angle manner and correspond to the light path propagation direction of the first laser; the fourth reflecting mirror and the third laser are arranged at an oblique angle of 45 degrees at the same time, are arranged in front of the light emitting side of the fourth plano-convex cylindrical lens and correspond to the light path propagation direction of the third laser.

10. The laser beam combining device based on bidirectional beam shaping as set forth in claim 2, wherein: the lens is arranged at the front end of the base along the light path propagation direction of the first laser, and the third reflecting mirror and the first laser are arranged in front of the light emitting side of the second plano-convex cylindrical lens in a 135-degree oblique angle arrangement mode and correspond to the light path propagation direction of the first laser; the fourth reflecting mirror and the third laser are arranged at 135-degree oblique angles at the same time and are arranged in front of the light emitting side of the fourth plano-convex cylindrical lens and correspond to the light path propagation direction of the third laser.