CN214313860U - Stable semiconductor laser - Google Patents

Abstract

The utility model provides a stable form semiconductor laser, including first light emitting module, second light emitting module, filter plate, focus subassembly and output optical fiber, still include and be located simultaneously the baffle of first light emitting module and second light emitting module light-emitting direction, and first light emitting module and second light emitting module are located the relative both sides of baffle, a plurality of external light redirectors correspond first light emitting module and second light emitting module set up, and the light that first light emitting module and second light emitting module jetted out turns to and avoids through the external light redirector that corresponds the baffle passes in proper order output optical fiber is jetted into to filter plate, focus subassembly, and the baffle is made by the heat conduction material and is connected with the heating panel. The baffle is positioned in the light emitting directions of the first light emitting module and the second light emitting module, so that the baffle can absorb stray light in the light emitting directions of the first light emitting module and the second light emitting module, and heat generated by absorbing the stray light is transmitted out through the heat dissipation plate, thereby ensuring the stable work of the laser.

Description

Stable semiconductor laser

Technical Field

The utility model relates to a laser instrument technical field especially relates to a stable form semiconductor laser.

Background

The laser is a device which generates laser by using a certain material (generally, a semiconductor) as a working substance, and the working principle is that the population inversion of an unbalanced carrier is realized between energy bands (a conduction band and a valence band) of the working substance or between the energy bands of the substance and an energy level of an impurity (an acceptor or a donor), and when a large number of electrons in the population inversion state are compounded with holes, the stimulated emission effect is generated. The semiconductor laser is one of the most important devices in the field of industrial laser at present, and can be used for high-power optical fiber laser pumping, high-power illumination, high-power semiconductor direct processing systems and the like.

Optical components such as a collimating mirror, a reflecting mirror and a focusing mirror are usually arranged in the laser to guide and adjust an internal laser light path so that internal laser light enters an output optical fiber to be output, however, errors are inevitably generated in the production and manufacturing processes of the laser, and due to the current process level, the limitation of processing equipment and the like, laser light emitted by a light emitting module in the laser cannot enter the output optical fiber according to a set light path to form stray light staying in the laser, and the stray light can increase the temperature of the laser, so that the work of a laser chip is influenced.

Disclosure of Invention

An object of the embodiment of the utility model is to provide a stable form semiconductor laser can effectively detach the inside parasitic light of laser instrument, ensures laser instrument job stabilization.

The utility model provides a stable form semiconductor laser, including first light emitting module, second light emitting module, filter plate, focus subassembly and output optical fiber, still include and be located simultaneously the baffle of first light emitting module and second light emitting module light-emitting direction, just first light emitting module and second light emitting module are located the relative both sides of baffle, a plurality of external light steering gears correspond first light emitting module and second light emitting module set up, the light that first light emitting module and second light emitting module jetted out turns to and avoids through the external light steering gear that corresponds the baffle passes in proper order output optical fiber is jetted into to filter plate, focus subassembly, the baffle is made by the heat conduction material and is connected with the heating panel.

Furthermore, the laser also comprises a third light-emitting module, a fourth light-emitting module and a polarization beam combiner, wherein the polarization beam combiner is provided with a first incident surface and a second incident surface, the first light-emitting module and the third light-emitting module are positioned at the same side of the baffle, the second light-emitting module and the fourth light-emitting module are positioned at the other side of the baffle, the external light redirector comprises a first light redirector positioned in the light-emitting direction of the first light-emitting module, a second light redirector positioned in the light-emitting direction of the second light-emitting module, a third light redirector positioned in the light-emitting direction of the third light-emitting module, a fourth light redirector positioned in the light-emitting direction of the fourth light-emitting module and a total light redirector arranged side by side with the first light redirector and the third light redirector, and light redirected by the first light redirector and the third light redirector is redirected by the total light redirector and then is emitted into the first incident surface, the light turned by the second light redirector and the fourth light redirector enters the second incidence surface, and the light-emitting surface of the polarization beam combiner faces the filter.

Further, the first light emitting module, the second light emitting module, the third light emitting module and the fourth light emitting module all comprise a plurality of steps and a plurality of laser emitting units, the laser emission units are correspondingly arranged on the upper surfaces of the corresponding steps one by one, the step height is higher the farther the laser emission units are away from the baffle plate, so that the laser emitted by any laser emitting unit can cross over other laser emitting units which belong to the same light emitting module and are positioned closer to the baffle plate, and the emergent light of the laser emission unit in the first light-emitting module is emitted into the first light redirector, the emergent light of the laser emission unit in the second light-emitting module is emitted into the second light redirector, the emergent light of the laser emission unit in the third light-emitting module is emitted into the third light redirector, emergent light of the laser emitting unit in the fourth light emitting module is emitted into the fourth light redirector.

The laser further comprises a first bottom plate and a second bottom plate which are connected with each other and arranged side by side, the upper surface of the first bottom plate is higher than the upper surface of the second bottom plate, one half of the baffle is positioned on the first bottom plate, the other half of the baffle is positioned on the second bottom plate, the first light-emitting module and the second light-emitting module are fixed at two opposite ends of the upper surface of the first bottom plate, the third light-emitting module and the fourth light-emitting module are fixed at two opposite ends of the upper surface of the second bottom plate, the first light diverter and the second light diverter are positioned on the upper surface of the first bottom plate, and the third light diverter and the fourth light diverter are positioned on the upper surface of the second bottom plate.

Further, the laser device further comprises a housing, a bottom plate of the housing is composed of a first bottom plate and a second bottom plate, side walls of the housing include a first side wall and a second side wall which are arranged oppositely, the first light emitting module and the second light emitting module are arranged at intervals back to the first side wall, the third light emitting module and the fourth light emitting module are arranged at intervals back to the second side wall, and the baffle is perpendicular to the first side wall and the second side wall and is not in contact with the first side wall and the second side wall.

Furthermore, the inner sides of the other side walls except the first side wall and the second side wall in the shell are provided with supporting parts, the upper surfaces of the supporting parts are lower than the upper surface of the side wall of the shell, the heat dissipation plate is upwards supported by the supporting parts and the baffle and is fixedly connected with the supporting parts and the baffle, the heat dissipation plate is suspended above the first light emitting module, the second light emitting module, the third light emitting module and the fourth light emitting module, and the shell and the baffle are integrally formed.

Furthermore, the laser emission units in the first light-emitting module and the third light-emitting module are in one-to-one correspondence and are arranged side by side, and the highest height of any laser emission unit in the third light-emitting module is less than or equal to the height of the step in the first light-emitting module, which is opposite to the highest height; the second light emitting module and the steps in the fourth light emitting module are in one-to-one correspondence and are arranged side by side, and the highest height of any laser emitting unit in the fourth light emitting module is smaller than or equal to the height of the step opposite to the highest height in the second light emitting module.

The laser further comprises a polarization beam combiner, the polarization beam combiner and the second light emitting module are located on the same side of the baffle, the polarization beam combiner is provided with a first incident surface and a second incident surface, light emitted by the first light emitting module is turned by the second external light steering device and enters the first incident surface by bypassing the baffle, light emitted by the second light emitting module is turned by the external light steering device and enters the second incident surface, and a light emitting surface of the polarization beam combiner faces the filter.

The utility model provides a stable form semiconductor laser has following beneficial effect: the baffle is located in the light emitting directions of the first light emitting module and the second light emitting module, so that stray light in the light emitting directions of the first light emitting module and the second light emitting module can be absorbed by the baffle, heat generated by absorbing the stray light is transmitted out through the heat dissipation plate, and stable work of the laser is guaranteed.

Drawings

Fig. 1 is an exploded perspective view of a stabilized semiconductor laser according to a first embodiment of the present invention;

fig. 2 is a perspective assembly view of a stabilized semiconductor laser according to a first embodiment of the present invention;

FIG. 3 is a top perspective view of FIG. 2;

FIG. 4 is a cross-sectional view in the BW-BW direction of FIG. 3;

fig. 5 is a schematic diagram of a stabilized semiconductor laser according to a second embodiment of the present invention;

in the figure:

1. a housing; 11. a first base plate; 12. a second base plate; 13. a first side wall; 14. a second side wall; 15. a support portion; 2. a heat dissipation plate; 21. a fixed mating hole; 3. a first light-emitting module; 4. a second light emitting module; 5. a third light emitting module; 6. a fourth light emitting module; 7. a laser emitting unit; 71. a laser chip; 72. a fast axis collimator; 73. a slow axis collimator; 74. an internal light redirector; 8. a step; 81. cushion blocks; 82. a main body portion; 9. an external light redirector; 91. a first external light diverter; 92. a second external light redirector; 93. a third external light redirector; 94. a fourth external light redirector; 95. a total light redirector; 10. a baffle plate; 101. a fixing hole; a. a filter plate; b. a focusing assembly; b1, fast axis focusing lens; b2, slow-axis focusing lens; c. an output optical fiber; d. a polarization beam combiner.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be further described with reference to the accompanying drawings.

Referring to fig. 1, 2 and 5, a stable semiconductor laser provided by the present invention includes a housing 1 and an optical assembly housed in the housing 1, referring to fig. 1 and 3, the optical assembly mainly includes a first light emitting module 3, a second light emitting module 4, a filter a, a focusing assembly b, an output optical fiber c, and a baffle 10 located in the light emitting direction of the first light emitting module 3 and the second light emitting module 4, the first light emitting module 3 and the second light emitting module 4 are located on opposite sides of the baffle 10, a plurality of external light redirectors 9 are disposed corresponding to the first light emitting module 3 and the second light emitting module 4, light emitted from the first light emitting module 3 and the second light emitting module 4 is redirected by the corresponding external light redirectors 9 to avoid the baffle 10 and sequentially pass through the filter a and the focusing assembly b to emit into the output optical fiber c, the baffle 10 is made of a heat conductive material and is connected to the heat dissipation plate 2.

In order to explain the technical solution of the present invention in detail, two embodiments are explained in detail below.

Example one

Referring to fig. 1 and fig. 3, the laser further includes a third light emitting module 5, a fourth light emitting module 6, and a polarization beam combiner d. The polarization beam combiner d comprises two triangular prisms and a beam combining surface located between the two triangular prisms, each triangular prism is provided with an incident surface which is a first incident surface and a second incident surface respectively, the first incident surface is perpendicular to the second incident surface, the surface of one incident surface is covered with a half-wave plate, light entering the polarization beam combiner through the half-wave plate is transmitted through the beam combining surface, and light entering the polarization beam combiner without passing through the half-wave plate is reflected by the beam combining surface. The light emitting surface of the polarization beam combiner is opposite to the half-wave plate a, the light emitting surface of the polarization beam combiner d is arranged towards the filter a, the filter a only allows laser with a specific wavelength to pass through, and the laser returned through the output optical fiber c and stray light in the laser cannot penetrate through the filter a, so that the attribute of the laser output through the output optical fiber c can be ensured, and the situation that the stray light and the like reversely penetrate through the filter a and then are retroreflected to each light emitting module to damage a laser chip of the light emitting module can be avoided. The focusing assembly b comprises a fast-axis focusing lens b1 and a slow-axis focusing lens b2, the filter a is arranged between the polarization beam combiner d and the fast-axis focusing lens b1, and the slow-axis focusing lens b2 is arranged between the fast-axis focusing lens b1 and the output optical fiber c.

Referring to fig. 3, the first light emitting module 3 and the third light emitting module 5 are located on the same side of the baffle 10 and are arranged in the same row, the second light emitting module 4 and the fourth light emitting module 6 are located on the other side of the baffle 10 and are arranged in the same row (i.e., along the length direction), meanwhile, the baffle 10 is located in the light emitting direction of the third light emitting module 5 and the fourth light emitting module 6, the first light emitting module 3 and the second light emitting module 4 are arranged in the same column (i.e., along the width direction perpendicular to the length direction), and the third light emitting module 5 and the fourth light emitting module 6 are arranged in the same column, so that the first light emitting module 3, the second light emitting module 4, the third light emitting module 5 and the fourth light emitting module 6 are arranged in a rectangular array overall.

Referring to fig. 3, the external light redirector 9 includes a first light redirector 91 located in the light emitting direction of the first light emitting module 3, a second light redirector 92 located in the light emitting direction of the second light emitting module 4, a third light redirector 93 located in the light emitting direction of the third light emitting module 5, a fourth light redirector 94 located in the light emitting direction of the fourth light emitting module 6, and a total light redirector 95 arranged side by side with the first light redirector 91 and the third light redirector 93.

The emergent light of the first light-emitting module 3 enters the first external light redirector 91, is redirected by the first external light redirector 91 to enter the total light redirector 95, the emergent light of the third light-emitting module 93 enters the third external light redirector 93, is redirected by the third external light redirector 93 to enter the total light redirector 95, the light from the first external light redirector 91 and the light from the third external light redirector 93 are spatially combined on the total light redirector 95, and then the total light redirector 95 directs the spatially combined light to the first incident surface of the polarization beam combiner d. The emergent light of the second light emitting module 4 enters the second external light diverter 92, is diverted by the second external light diverter 92 to enter a half-wave plate and a second incident surface of the polarization beam combiner d in sequence, the emergent light of the fourth light emitting module 6 enters the fourth external light diverter 94, is diverted by the fourth external light diverter 94 to enter the half-wave plate and the second incident surface of the polarization beam combiner d, penetrates through the beam combining surface under the action of the half-wave plate, and is combined with the light entering from the first incident surface and reflected by the beam combining surface in the light emitting direction of the beam combining surface to form polarization combined light, and the polarization combined light exits from the light emitting surface of the polarization beam combiner d to enter the filter plate a.

Specifically, referring to fig. 1 and 3, each of the first light-emitting module 3, the second light-emitting module 4, the third light-emitting module 5, and the fourth light-emitting module 6 includes a plurality of steps 8 and a plurality of laser emitting units 7, the laser emitting units 7 are correspondingly disposed on the upper surfaces of the corresponding steps 8, and the height of the step 8 farther from the baffle 10 is higher (as shown in fig. 4), so that the laser emitted by any one of the laser emitting units 7 can cross over the other laser emitting units 7 belonging to the same light-emitting module and located closer to the baffle 10 without being blocked, and the emergent light of all the laser emitting units 7 in the first light-emitting module 1 is directed to the first light redirector 91 without being blocked, and the emergent light of all the laser emitting units 7 in the second light-emitting module 4 is directed to the second light redirector 92 without being blocked by the height difference formed by each step 8, the emergent light of all the laser emitting units 7 in the third light emitting module 5 is emitted to the third light diverter 93 without being blocked, and the emergent light of all the laser emitting units 7 in the fourth light emitting module 6 is emitted to the fourth light diverter 94 without being blocked.

Referring to fig. 1, each of the laser emitting units 7 includes a laser chip 71, a fast axis collimator 72 attached to a light exit surface of the laser chip 71, and a slow axis collimator 73 located in a light exit direction of the corresponding fast axis collimator 72, each of the steps 8 includes a main body 82 and a cushion block 81 fixed to the main body 82, the laser chip 71 is fixed to the corresponding cushion block 81, the slow axis collimator 73 is fixed to the corresponding main body 82, and the laser emitted by each of the laser chips 71 is collimated by the corresponding fast axis collimator 72 and the slow axis collimator 73 and then directed toward the baffle 10.

In this embodiment, referring to fig. 1 and fig. 3, the laser chips 71, the fast axis collimators 72, and the slow axis collimators 73 in each of the laser emitting units 7 are arranged side by side, in order to enable light emitted by the laser chips 71 to be emitted toward the direction of the baffle 10, each of the laser emitting units 7 further includes an internal light redirector 74, the internal light redirector 74 is disposed on the corresponding main body 82 and located in the light emitting direction of the corresponding slow axis collimator 73, the light emitting direction of each of the laser chips 71 is parallel to the extending direction of the baffle 10, the emergent light of the slow axis collimator 73 in the first light emitting module 3 is emitted into the first light redirector 91 after being redirected by 90 degrees through the corresponding internal light redirector 74, the emergent light of the slow axis collimator 73 in the second light emitting module 4 is emitted into the second light redirector 92 after being redirected by 90 degrees through the corresponding internal light redirector 74, the emergent light of the slow axis collimator 73 in the third light emitting module 5 is turned by 90 ° by the corresponding internal light redirector 74 and then enters the third light redirector 93, and the emergent light of the slow axis collimator 73 in the fourth light emitting module 6 is turned by 90 ° by the corresponding internal light redirector 74 and then enters the fourth light redirector 94.

It is not excluded that in other embodiments, the laser chip 71, the fast axis collimator 72, and the slow axis collimator 73 of each of the laser emitting units 7 are arranged in parallel, so that the light emitting direction of the laser chip 71 is directly aligned with the baffle 10.

The emergent light of the first, second, third and fourth light-emitting modules 3, 4, 5 and 6 is directed towards the baffle 10, when the first, second, third and fourth external light redirectors 91, 92, 93 and 94 are subject to errors caused by process or other reasons, part of the emergent light of the first, second, third and fourth light-emitting modules 3, 4, 5 and 6 passes over or penetrates through the corresponding first, second, third and fourth external light redirectors 91, 92, 93 and 94 to form stray light which cannot be output from the output optical fiber c, and the stray light will continue to propagate forwards and enter the baffle 10 to be absorbed by the baffle 10, preferably the baffle 10 is made of oxygen-free copper, and the surface of the copper is coated with a black coating layer, to enhance the light absorption of the baffle 10.

Referring to fig. 1, in this embodiment, the laser further includes a first bottom plate 11 and a second bottom plate 12 connected to each other and disposed side by side, an upper surface of the first bottom plate 11 is higher than an upper surface of the second bottom plate 12, a half of the baffle 10 is located on the first bottom plate 11, the other half of the baffle 10 is located on the second bottom plate 12, the first light emitting module 3 and the second light emitting module 4 are fixed at two opposite ends of the upper surface of the first bottom plate 11, and the third light emitting module 5 and the fourth light emitting module 6 are fixed at two opposite ends of the upper surface of the second bottom plate 12. The first and second light redirectors 91, 92 are located on the upper surface of the first base plate 11 and the third and fourth light redirectors 93, 94 are located on the upper surface of the second base plate 12 such that light redirected by the first light redirector 91 can pass through the third light redirector 93 into the total light redirector 95 and light redirected by the second light redirector 92 can pass through the fourth light redirector 94 into the half wave plate.

Referring to fig. 1 and 3, a bottom plate of the housing 1 is composed of the first bottom plate 11 and the second bottom plate 12, that is, the first bottom plate 11 and the second bottom plate 12 belong to the housing 1, a first side wall 13 and a second side wall 14 are oppositely disposed in a side wall of the housing 1, the first light emitting module 3 and the second light emitting module 4 are disposed at intervals back to the first side wall 13, the third light emitting module 5 and the fourth light emitting module 6 are disposed at intervals back to the second side wall 14, and the baffle 10 is perpendicular to the first side wall 13 and the second side wall 14 and has no contact with the first side wall 13 and the second side wall 14.

Referring to fig. 1, 2 and 4, a support portion 15 is disposed on an inner side of the other side walls of the housing 1 except the first side wall 13 and the second side wall 14, an upper surface of the support portion 15 is lower than an upper surface of the side wall of the housing 1, the heat dissipation plate 2 is supported by and fixedly connected to the support portion 15 and the baffle plate 10 (referring to fig. 1 and 2, fixing holes 101 are disposed on the support portion 15 and the baffle plate 10, fixing holes 21 corresponding to the fixing holes 101 are disposed on the heat dissipation plate 2, after the heat dissipation plate 2 is supported by the support portion 15 and the baffle plate 10, the heat dissipation plate 2 is fixed to the support portion 15 and the baffle plate 10 by driving or screwing bolts or screws into the corresponding fixing holes 21 and fixing holes 101), and the heat dissipation plate 2 is suspended in the first light emitting module 3, the second light emitting module 4, and the baffle plate 10, Above the third light emitting module 5 and the fourth light emitting module 6, the housing 1, the baffle 10 and the step 8 are integrally formed.

The first light-emitting module 3 and the laser emitting units 7 in the third light-emitting module 4 are in one-to-one correspondence and are arranged side by side, and the highest height of any laser emitting unit 7 in the third light-emitting module 5 is less than or equal to the height of a step 8, which is just opposite to the laser emitting unit 7, in the first light-emitting module 3; the second light emitting modules 4 are in one-to-one correspondence with the steps 8 in the fourth light emitting module 6 and are arranged side by side, and the highest height of any laser emitting unit 7 in the fourth light emitting module 6 is smaller than or equal to the height of the step 8, which is opposite to the laser emitting unit 7, in the second light emitting module 4. Therefore, if part of the outgoing light of the laser chip 71 and/or the slow axis collimator 73 in the third light emitting module 5 passes through or penetrates the corresponding inner light redirector 74 to form stray light due to a system error or other reasons, the side surface of the part of the first base plate 11 higher than the second base plate 12 and the side surface of the corresponding step 8 in the first light emitting module 3 absorb the stray light, and similarly, if part of the outgoing light of the laser chip 71 and/or the slow axis collimator 73 in the fourth light emitting module 6 passes through or penetrates the corresponding inner light redirector 74 to form stray light due to a system error or other reasons, the side surface of the part of the first base plate 11 higher than the second base plate 12 and the side surface of the corresponding step 8 in the second light emitting module 4 absorb the stray light. Similarly, if part of the outgoing light of the laser chip 71 and/or the slow axis collimator 73 in the first light emitting module 3 passes through or penetrates the corresponding internal light redirector 74 to form stray light due to a system error or other reasons, the stray light is absorbed by the second sidewall in the stray light traveling direction, and if part of the outgoing light of the laser chip 71 and/or the slow axis collimator 73 in the second light emitting module 4 passes through or penetrates the corresponding internal light redirector 74 to form stray light due to a system error or other reasons, the stray light is absorbed by the second sidewall in the stray light traveling direction. That is, the stray light inside each of the laser emitting units 7 in the first light emitting module 3 and the second light emitting module 4 will be absorbed by the second sidewall 14 facing thereto, and the stray light inside each of the laser emitting units 7 in the third light emitting module 5 and the fourth light emitting module 6 will be absorbed by the side face of the step 8 of the first bottom plate 11 facing thereto and the side face of the first bottom plate 11 where the first bottom plate 11 is exposed from the second bottom plate 12. The stray light in the emergent light of the first light-emitting module 3, the second light-emitting module 4, the third light-emitting module 5 and the fourth light-emitting module 6 and the stray light in the turning process of the emergent light can be absorbed by the baffle 10.

Because casing 1, baffle 10 and step 8 integrated into one piece, baffle 10 is upwards connected with heating panel 2, the bottom plate is connected heat exchanger or the inside heat dissipation water route that is equipped with of bottom plate downwards, thereby casing 1, step 8 and baffle 10 can be fast transmitted away because of the heat that absorbs the miscellaneous light and produce, thereby when reducing the inside miscellaneous light of laser instrument, can in time dispel the high temperature that produces because of miscellaneous light, ensure that laser chip 71 normally works.

Example two

As shown in fig. 5, the main difference between the second embodiment and the first embodiment is: the laser comprises only two light emitting modules, namely a first light emitting module 3 and a second light emitting module 4, and further comprises a polarization beam combiner d, wherein the polarization beam combiner d and the second light emitting module 4 are located on the same side of the baffle 10, the polarization beam combiner d is provided with a first incidence surface and a second incidence surface, light emitted by the first light emitting module 3 is turned by the second external light steering device 9 and bypasses the baffle 10 to be emitted into the first incidence surface, light emitted by the second light emitting module 4 is turned by the first external light steering device 9 to be emitted into the second incidence surface, and a light emitting surface of the polarization beam combiner d is arranged towards the filter a.

The polarization beam combiner d is used for polarization beam combination of the light from different light emitting modules so as to increase the brightness of the laser light emitted into the output optical fiber c.

In this document, the terms front, back, upper and lower are used to define the components in the drawings and the positions of the components relative to each other, and are used for clarity and convenience of the technical solution. It is to be understood that the use of the directional terms should not be taken to limit the scope of the claims.

The features of the embodiments and embodiments described herein above may be combined with each other without conflict.

The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.

Claims (8)

1. A stabilized semiconductor laser characterized by: the LED lamp comprises a first light-emitting module, a second light-emitting module, a filter plate, a focusing assembly, an output optical fiber and a baffle plate which is positioned in the light-emitting direction of the first light-emitting module and the light-emitting direction of the second light-emitting module at the same time, wherein the first light-emitting module and the second light-emitting module are positioned on two opposite sides of the baffle plate, a plurality of external light redirectors are arranged corresponding to the first light-emitting module and the second light-emitting module, light emitted by the first light-emitting module and the second light-emitting module is redirected by the corresponding external light redirectors to avoid the baffle plate and sequentially penetrate through the filter plate and the focusing assembly to be emitted into the output optical fiber, and the baffle plate is made of a heat conduction material and is connected with a heat dissipation plate.

2. A stabilized semiconductor laser according to claim 1, wherein: the laser also comprises a third light-emitting module, a fourth light-emitting module and a polarization beam combiner, wherein the polarization beam combiner is provided with a first incident surface and a second incident surface, the first light-emitting module and the third light-emitting module are positioned at the same side of the baffle, the second light-emitting module and the fourth light-emitting module are positioned at the other side of the baffle, the external light redirector comprises a first light redirector positioned in the light-emitting direction of the first light-emitting module, a second light redirector positioned in the light-emitting direction of the second light-emitting module, a third light redirector positioned in the light-emitting direction of the third light-emitting module, a fourth light redirector positioned in the light-emitting direction of the fourth light-emitting module and a total light redirector arranged side by side with the first light redirector and the third light redirector, and light redirected by the first light redirector and the third light redirector is redirected by the total light redirector and then is emitted into the first incident surface, the light turned by the second light redirector and the fourth light redirector enters the second incidence surface, and the light-emitting surface of the polarization beam combiner faces the filter.

3. A stabilized semiconductor laser according to claim 2, wherein: the first light emitting module, the second light emitting module, the third light emitting module and the fourth light emitting module all comprise a plurality of steps and a plurality of laser emitting units, the laser emission units are correspondingly arranged on the upper surfaces of the corresponding steps one by one, the step height is higher the farther the laser emission units are away from the baffle plate, so that the laser emitted by any laser emitting unit can cross over other laser emitting units which belong to the same light emitting module and are positioned closer to the baffle plate, and the emergent light of the laser emission unit in the first light-emitting module is emitted into the first light redirector, the emergent light of the laser emission unit in the second light-emitting module is emitted into the second light redirector, the emergent light of the laser emission unit in the third light-emitting module is emitted into the third light redirector, emergent light of the laser emitting unit in the fourth light emitting module is emitted into the fourth light redirector.

4. A stabilized semiconductor laser according to claim 3, wherein: the laser also comprises a first bottom plate and a second bottom plate which are connected with each other and arranged side by side, the upper surface of the first bottom plate is higher than the upper surface of the second bottom plate, one half of the baffle is positioned on the first bottom plate, the other half of the baffle is positioned on the second bottom plate, the first light-emitting module and the second light-emitting module are fixed at two opposite ends of the upper surface of the first bottom plate, the third light-emitting module and the fourth light-emitting module are fixed at two opposite ends of the upper surface of the second bottom plate, the first light diverter and the second light diverter are positioned on the upper surface of the first bottom plate, and the third light diverter and the fourth light diverter are positioned on the upper surface of the second bottom plate.

5. A stabilized semiconductor laser according to claim 4, wherein: the laser device further comprises a shell, the bottom plate of the shell is composed of a first bottom plate and a second bottom plate, the side wall of the shell comprises a first side wall and a second side wall which are oppositely arranged, the first light-emitting module and the second light-emitting module are mutually spaced and lean against the first side wall, the third light-emitting module and the fourth light-emitting module are mutually spaced and lean against the second side wall, and the baffle is perpendicular to the first side wall and the second side wall and is not in contact with the first side wall and the second side wall.

6. A stabilized semiconductor laser according to claim 5, wherein: the heat dissipation plate is characterized in that supporting parts are arranged on the inner sides of other side walls except the first side wall and the second side wall in the shell, the upper surface of each supporting part is lower than the upper surface of the corresponding side wall of the shell, the heat dissipation plate is upwards supported by the supporting parts and the corresponding baffle and is fixedly connected with the supporting parts and the corresponding baffle, the heat dissipation plate is suspended above the first light emitting module, the second light emitting module, the third light emitting module and the fourth light emitting module, and the shell and the baffle are integrally formed.

7. A stabilized semiconductor laser according to claim 4, wherein: the laser emitting units in the first light emitting module and the third light emitting module are in one-to-one correspondence and are arranged side by side, and the highest height of any laser emitting unit in the third light emitting module is smaller than or equal to the height of the step opposite to the laser emitting unit in the first light emitting module; the second light emitting module and the steps in the fourth light emitting module are in one-to-one correspondence and are arranged side by side, and the highest height of any laser emitting unit in the fourth light emitting module is smaller than or equal to the height of the step opposite to the highest height in the second light emitting module.

8. A stabilized semiconductor laser according to claim 1, wherein: the laser device further comprises a polarization beam combiner, the polarization beam combiner and the second light emitting module are located on the same side of the baffle, the polarization beam combiner is provided with a first incident surface and a second incident surface, light emitted by the first light emitting module is turned by the second external light steering device and enters the first incident surface by bypassing the baffle, light emitted by the second light emitting module is turned by the external light steering device and enters the second incident surface, and a light emitting surface of the polarization beam combiner faces the filter.

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