A laser pump source

Abstract

The application discloses a kind of laser pump sources, including base, and first light emitting unit, second light emitting unit, beam combination unit and coupling unit are arranged on base;First light emitting unit and / or second light emitting unit are obliquely arranged in the direction of emitting light beam, so that the light outlet of first light emitting unit and the light outlet of second light emitting unit are located at different heights, and the optical path of obliquely arranged first light emitting unit and / or second light emitting unit is provided with a pressure light reflector, and the pressure light reflector is used to press the oblique light emitted by first light emitting unit and / or second light emitting unit into horizontal light;Beam combination unit is used for polarized beam combination of light beam emitted by first light emitting unit and second light emitting unit, and coupling unit is used for coupling the light beam after polarization beam combination into optical fiber.The laser pump source of the application not only has compact structure, but also has lower spectral width.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of laser, in particular to a kind of laser pump source. BACKGROUND

[0002] Due to the lightweight demand of fiber laser and solid laser, as the main weight of which, laser pump source needs to be lightweight, and at present, the lightweight requirement is mainly realized by using materials with small density.The existing technical scheme adopts multiple semiconductor lasers to form two light emitting units, and the center spot heights of the two light emitting units are consistent, thereby realizing high-power output.

[0003] In the implementation of the present application, the inventor found that at least the following problems exist in the prior art: in the process of designing the laser pump source, in order to avoid interference of optical components, the optical path design is not dense enough, which will cause a lot of idle space inside the laser, resulting in a large volume of laser pump source. SUMMARY

[0004] In view of the above problems, the present application discloses a kind of laser pump source to overcome the above problems or at least partially solve the above problems.

[0005] In order to achieve the above purpose, the present application adopts the following technical scheme:

[0006] The present application provides a kind of laser pump source, including base, and first light emitting unit, second light emitting unit, beam combining unit and coupling unit are arranged on the base;The first light emitting unit includes at least one first die, the second light emitting unit includes at least one second die, each first die and each second die are arranged in the same direction in horizontal plane and side by side;

[0007] The first light emitting unit and / or the second light emitting unit are inclined in the direction of emitting light beam, so that the light outlet of the first light emitting unit and the light outlet of the second light emitting unit are located at different heights, and a light compression mirror is arranged on the optical path of the inclined first light emitting unit and / or the second light emitting unit, the light compression mirror is used to compress the inclined light emitted by the first light emitting unit and / or the second light emitting unit into horizontal light;

[0008] The beam combining unit is used for polarized beam combining of the light beams emitted by the first light emitting unit and the second light emitting unit, and the coupling unit is used for coupling the polarized beam combined light beam into the optical fiber.

[0009] Further, the first light emitting unit is inclined upward by a first preset angle in the direction of emitting light beam, and the second light emitting unit is inclined downward by a second preset angle in the direction of emitting light beam.

[0010] Further, the first light emitting units are arranged on a first stepped structure, each of the first dies is arranged on a different step, the second light emitting units are arranged on a second stepped structure, and each of the second dies is arranged on a different step.

[0011] Further, the light beams emitted by the first light emitting units and the light beams emitted by the second light emitting units are in the same direction or in opposite directions.

[0012] Further, the light exit port of the first die is provided with a first fast-axis collimating lens, a first slow-axis collimating lens, and a first reflector, so that the light beam emitted by the first die passes through the first fast-axis collimating lens, the first slow-axis collimating lens, and the first reflector in sequence to reach the beam combining unit.

[0013] The light exit port of the second die is provided with a second fast-axis collimating lens, a second slow-axis collimating lens, and a second reflector, so that the light beam emitted by the second die passes through the second fast-axis collimating lens, the second slow-axis collimating lens, and the second reflector in sequence to reach the beam combining unit.

[0014] The first slow-axis collimating lens and the second slow-axis collimating lens are located at different heights, and the first reflector and the second reflector are located at different heights.

[0015] Further, the first slow-axis collimating lens and the second slow-axis collimating lens are arranged in an overlapping manner in the vertical direction, the first reflector is located between the second fast-axis collimating lens and the second slow-axis collimating lens, and the second reflector is located between the first fast-axis collimating lens and the first slow-axis collimating lens.

[0016] Further, the beam combining unit includes a third reflector, a polarization beam combining prism, and a light raising mirror.

[0017] The third reflector is used to change the direction of the light beams emitted by the first light emitting units or the second light emitting units, the light raising mirror is used to change the height of the central light spots emitted by the first light emitting units or the second light emitting units, so that the heights of the central light spots emitted by the first light emitting units and the second light emitting units are consistent, and the polarization beam combining prism is used to polarization beam combine the light beams emitted by the first light emitting units and the second light emitting units.

[0018] Further, the beam combining unit further includes an expansion mirror.

[0019] The expansion mirror is used to expand the diameter of the light beams emitted by the first light emitting units or the second light emitting units.

[0020] Further, the coupling unit includes a focusing lens.

[0021] Further, the coupling unit comprises a slow-axis focusing mirror and a fast-axis focusing mirror.

[0022] The advantages and beneficial effects of the present application are:

[0023] In the laser pump source of the present application, the light outlets of the first light emitting unit and the second light emitting unit are arranged at different heights, so that the light beams emitted by the first light emitting unit and the second light emitting unit are arranged in an up-down staggered manner, forming a three-dimensional dense light path. Compared with the existing laser pump source, the distance between adjacent dies in the same light emitting unit is reduced, and the distance between the two light emitting units is also reduced. Under the premise of consistent number of dies, the volume of the entire laser pump source is reduced, the utilization efficiency of the internal space is improved, and the weight of the laser pump source is reduced. In addition, by tilting the first light emitting unit and / or the second light emitting unit in the direction of the emitted light beam, the light outlets of the first light emitting unit and the second light emitting unit are arranged at different heights. In this way, the temperature of the first light emitting unit and the second light emitting unit after power-on can be kept consistent, thereby reducing the spectral width of the laser pump source. BRIEF DESCRIPTION OF DRAWINGS

[0024] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments with reference made to the accompanying drawings. The drawings are for purposes of illustration only and are not intended to be limiting in any respect. Like reference numerals are used to indicate like parts throughout the various drawings. In the drawings:

[0025] Figure 1 is a top view of the laser pump source in Embodiment 1 of the present application;

[0026] Figure 2 is a front view of the laser pump source in Embodiment 1 of the present application;

[0027] Figure 3 is a perspective view of the laser pump source in Embodiment 2 of the present application;

[0028] Figure 4 is a top view of the laser pump source in Embodiment 2 of the present application;

[0029] Figure 5 is a front view of the laser pump source in Embodiment 2 of the present application;

[0030] Figure 6 is a perspective view of the laser pump source in Embodiment 3 of the present application;

[0031] Figure 7 is a top view of the laser pump source in Embodiment 3 of the present application;

[0032] Figure 8Front view of the laser pump source in embodiment 3 of the present application;

[0033] Figure 9 Front view of the laser pump source in embodiment 4 of the present application;

[0034] Figure 10 Front view of the laser pump source in embodiment 4 of the present application;

[0035] Figure 11 Front view of the laser pump source in embodiment 4 of the present application;

[0036] Figure 12 Front view of the laser pump source in embodiment 5 of the present application;

[0037] Figure 13 Front view of the laser pump source in embodiment 5 of the present application;

[0038] Figure 14 Front view of the laser pump source in embodiment 5 of the present application;

[0039] Figure 15 Front view of the laser pump source in embodiment 6 of the present application;

[0040] Figure 16 Front view of the laser pump source in embodiment 6 of the present application;

[0041] Figure 17 Front view of the laser pump source in embodiment 6 of the present application;

[0042] Figure 18 Front view of the laser pump source in embodiment 7 of the present application;

[0043] Figure 19 Front view of the laser pump source in embodiment 7 of the present application;

[0044] Figure 20 Front view of the laser pump source in embodiment 7 of the present application.

[0045] In the figure: 1, base; 2, first die; 3, second die; 4, smoothing mirror; 5, optical fiber; 6, first fast-axis collimating lens; 7, first slow-axis collimating lens; 8, first mirror; 9, second fast-axis collimating lens; 10, second slow-axis collimating lens; 11, second mirror; 12, third mirror; 13, polarization beam combining prism; 14, light raising mirror; 15, beam expander; 16, focusing lens; 17, slow-axis focusing mirror; 18, fast-axis focusing mirror; 19, fourth mirror; 20, fifth mirror; 21, Bragg grating. DETAILED DESCRIPTION

[0046] In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions of the present application will be described below in connection with the embodiments of the present application and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0047] The technical solutions provided by the embodiments of the present application will be described in detail below in connection with the drawings.

[0048] Embodiment 1

[0049] The present embodiment discloses a laser pump source, as shown in Figure 1 and Figure 2 The laser pump source comprises a base 1, and a first light emitting unit, a second light emitting unit, a beam combining unit and a coupling unit arranged on the base 1; the first light emitting unit comprises at least one first die 2, and the second light emitting unit comprises at least one second die 3, each first die 2 and each second die 3 are arranged side by side in the same direction in a horizontal plane; wherein the number of the first die 2 and the second die 3 can be set according to actual needs. In addition, the base 1 is located inside a tube shell and mainly plays a supporting role for bearing optical devices and supporting structures. The tube shell can adopt an integrated structure or a split structure, and the material of the tube shell can be a metal material or a plurality of metal materials. When the tube shell is a plurality of metal materials, the tube shell is formed by laminating metal sheets or metal blocks of different materials. Moreover, the tube shell is fixed on a water cooling plate to realize cooling of the first die 2 and the second die 3 through the water cooling plate.

[0050] Specifically, the first light emitting unit is inclined upward by a first preset angle in the direction of the emitted light beam, wherein the first preset angle is 30°-60°, and the second light emitting unit is arranged horizontally. In this way, the light outlet of the first light emitting unit and the light outlet of the second light emitting unit are located at different heights, that is, the light beam emitted by the first light emitting unit is located above the light beam emitted by the second light emitting unit. A light compression mirror 4 is arranged on the light path of the first light emitting unit, and the light compression mirror 4 is used to compress the inclined light emitted by the first light emitting unit into horizontal light, so as to make the light beam emitted by the first light emitting unit parallel to the light beam emitted by the second light emitting unit. That is, a light compression mirror 4 is arranged on the light path of each first die 2, and each light compression mirror 4 can be a whole mirror. Of course, each light compression mirror 4 can also be arranged separately.

[0051] The beam combining unit is used to polarize and combine the light beams emitted by the first light emitting unit and the second light emitting unit, and the coupling unit is used to couple the polarized and combined light beam into an optical fiber 5.

[0052] The laser pump source of the embodiment is characterized in that the light outlets of the first light emitting unit and the second light emitting unit are arranged at different heights, so that the light beams emitted by the first light emitting unit and the second light emitting unit are arranged in an up-down staggered manner, forming a three-dimensional dense light path. Compared with the existing laser pump source, the distance between adjacent dies in the same light emitting unit is reduced, and the distance between the two light emitting units is also reduced. Under the premise of the same number of dies, the volume of the entire laser pump source is reduced, the utilization efficiency of the internal space is improved, and the weight of the laser pump source is reduced. In addition, by arranging the first light emitting unit to be inclined in the direction of the emitted light beam and arranging the second light emitting unit to be horizontal, the light outlets of the first light emitting unit and the second light emitting unit are arranged at different heights. In this way, the temperatures of the first light emitting unit and the second light emitting unit after being powered on are consistent, thereby reducing the spectral width of the laser pump source.

[0053] It should be noted that since the first light emitting unit and the second light emitting unit are cooled by the water-cooled plate below the base, the closer the light emitting unit is to the water-cooled plate, the better the cooling effect. Since the water-cooled plate is located below the base, that is, the lower the horizontal height of the light emitting unit, the better the cooling effect. In order to arrange the light beams emitted by the first light emitting unit and the second light emitting unit in an up-down staggered manner, it is necessary to arrange the first light emitting unit and the second light emitting unit at different horizontal heights, which will result in different cooling capacities of the first light emitting unit and the second light emitting unit, thereby causing the wavelengths of the light beams emitted by the first die and the second die to be different, widening the spectral width of the laser pump source and affecting the conversion efficiency of the laser pump source. In the embodiment, by arranging the first light emitting unit to be inclined in the direction of the emitted light beam and arranging the second light emitting unit to be horizontal, the average horizontal height of the first light emitting unit is consistent with the average horizontal height of the second light emitting unit while ensuring that the light beams emitted by the first light emitting unit and the second light emitting unit are arranged in an up-down staggered manner. In this way, the cooling capacities of the first light emitting unit and the second light emitting unit are consistent, and the temperatures of the first light emitting unit and the second light emitting unit after being powered on are consistent, thereby reducing the spectral width of the laser pump source.

[0054] Of course, in other embodiments, the first light emitting unit can also be tilted downward by a first preset angle in the direction of the outgoing light beam, or the first light emitting unit is horizontally arranged, while the second light emitting unit is tilted downward or upward by a second preset angle in the direction of the outgoing light beam. The second preset angle is 30°-60°. It should be noted that when the first light emitting unit is tilted downward by a first preset angle in the direction of the outgoing light beam, and the second light emitting unit is tilted upward by a second preset angle in the direction of the outgoing light beam, or when the first light emitting unit is tilted upward by a first preset angle in the direction of the outgoing light beam, and the second light emitting unit is tilted downward by a second preset angle in the direction of the outgoing light beam, the values of the first preset angle and the second preset angle can be the same, and in other cases, the values of the first preset angle and the second preset angle are different.

[0055] In the present embodiment, the first light emitting unit is arranged on an inclined stepped structure, each first die 2 is arranged on a different step, and the second light emitting unit is arranged on another stepped structure, each second die 3 is arranged on a different step, so that the light beams emitted by each first die 2 and each second die 3 are prevented from being blocked.

[0056] In addition, the light beams emitted by the first light emitting unit and the second light emitting unit are opposite, that is, the first light emitting unit and the second light emitting unit are arranged at different positions, and the first light emitting unit and the second light emitting unit are arranged on both sides of the base 1.

[0057] Further, the first die 2 is provided with a first fast-axis collimating lens 6, a first slow-axis collimating lens 7, and a first mirror 8 at the light outlet, and the light compression mirror 4 is located between the first fast-axis collimating lens 6 and the first slow-axis collimating lens 7, so that the light beam emitted by the first die 2 passes through the first fast-axis collimating lens 6, the light compression mirror 4, the first slow-axis collimating lens 7, and the first mirror 8 in turn to reach the beam combining unit.

[0058] The second die 3 is provided with a second fast-axis collimating lens 9, a second slow-axis collimating lens 10, and a second mirror 11 at the light outlet, so that the light beam emitted by the second die 3 passes through the second fast-axis collimating lens 9, the second slow-axis collimating lens 10, and the second mirror 11 in turn to reach the beam combining unit.

[0059] The first slow-axis collimating lens 7 and the second slow-axis collimating lens 10 are located at different heights, and the first mirror 8 and the second mirror 11 are located at different heights, so as to ensure that the light beams emitted by the dies can pass through the corresponding slow-axis collimating lenses and mirrors. Specifically, in the present embodiment, the horizontal height of the first slow-axis collimating lens 7 is higher than the horizontal height of the second slow-axis collimating lens 10, and the horizontal height of the first mirror 8 is higher than the horizontal height of the second mirror 11.

[0060] And, the first slow-axis collimating lens 7 and the second slow-axis collimating lens 10 are arranged in the vertical direction in an overlapping manner, the first mirror 8 is located between the second fast-axis collimating lens 9 and the second slow-axis collimating lens 10, and the second mirror 11 is located between the first fast-axis collimating lens 6 and the first slow-axis collimating lens 7, so that the distance between the first light emitting unit and the second light emitting unit can be shortened, and the structure of the laser pump source is more compact.

[0061] In the embodiment, as shown in Figure 1 The beam combining unit includes a third mirror 12, a polarization beam combining prism 13, and a light raising mirror 14.

[0062] The third mirror 12 is used to change the direction of the light beam emitted by the first light emitting unit, so that the light beam can be reflected by 90° and be directed to the light raising mirror 14. The light raising mirror 14 is used to change the height of the central light spot emitted by the first light emitting unit, so that the heights of the central light spots emitted by the first light emitting unit and the second light emitting unit are consistent. It should be understood that the principle of the light raising mirror 14 is the same as that of a periscope, which is composed of two plane mirrors that are parallel to each other and form an angle of 45° with the horizontal plane. The positions of the light inlet and the light outlet of the light raising mirror 14 can be exchanged, so that the central light spot can be raised or lowered. In the embodiment, the height of the central light spot emitted by the first light emitting unit is lowered by the light raising mirror 14, so that the heights of the central light spots emitted by the first light emitting unit and the second light emitting unit are consistent. The polarization beam combining prism 13 is used to polarize and combine the light beams emitted by the first light emitting unit and the second light emitting unit. The polarization beam combining prism 13 has a polarizer inside, which first polarizes the light beams emitted by the first light emitting unit and the second light emitting unit, and then polarizes and combines the light beams. Of course, in other embodiments, the height of the central light spot emitted by the second light emitting unit can be raised by the light raising mirror, so that the heights of the central light spots emitted by the first light emitting unit and the second light emitting unit are consistent.

[0063] And, the base 1 is further provided with a fourth mirror 19, which is used to change the direction of the light beam emitted by the polarization beam combining prism 13, so that the light beam is directed to the coupling unit.

[0064] In addition, the coupling unit includes a focusing lens 16, which is used to couple the light beam emitted by the beam combining unit into the optical fiber 5.

[0065] The light beam path in this embodiment is as follows: the light beam emitted by the first light emitting unit is firstly collimated in the fast axis direction by the first fast axis collimating lens 6, then flattened by the light compression mirror 4, transmitted in the horizontal direction, collimated in the slow axis direction by the first slow axis collimating lens 7, reflected by the first mirror 8 to the third mirror 12, reflected by the third mirror 12, lowered in height by the light raising mirror 14, and finally shot to the polarization beam combining prism 13; the light beam emitted by the second light emitting unit is firstly collimated in the fast axis direction by the second fast axis collimating lens 9, then collimated in the slow axis direction by the second slow axis collimating lens 10, reflected by the second mirror 11 to the polarization beam combining prism 13; the light beams emitted by the first and second light emitting units are polarization beam combined by the polarization beam combining prism 13, reflected by the fourth mirror 19 to the focusing lens 16, and coupled into the optical fiber 5 by the focusing lens 16.

[0066] Embodiment 2

[0067] The difference between this embodiment and Embodiment 1 is that, as shown in Figures 3 to 5 the light beams emitted by the first and second light emitting units are polarization beam combined by the polarization beam combining prism 13, directly shot to the focusing lens 16, and coupled into the optical fiber 5 by the focusing lens 16, so that the direction of the coupled light beam can be changed, i.e. the direction of the optical fiber 5 can be changed.

[0068] Embodiment 3

[0069] The difference between this embodiment and Embodiment 1 is that, as shown in Figures 6 to 8 the coupling unit comprises a slow axis focusing lens 17 and a fast axis focusing lens 18, and the fast axis focusing lens 18 is located between the slow axis focusing lens 17 and the fourth mirror 19, so that the polarization beam combined light beam is reflected by the fourth mirror 19, sequentially passes through the fast axis focusing lens 18 and the slow axis focusing lens 17, and is coupled into the optical fiber 5. The slow axis focusing lens 17 and the fast axis focusing lens 18 can achieve better coupling effect than a single focusing lens.

[0070] Embodiment 4

[0071] The difference between this embodiment and Embodiment 1 is that, as shown in Figures 9 to 11As shown, the first light-emitting unit and the second light-emitting unit are located on the same side of the base 1, and the light beam emitted by the first tube core 2 is in the same direction as the light beam emitted by the second tube core 3. As a result, the positions of the second fast-axis collimating lens 9, the second slow-axis collimating lens 10, and the second reflector 11 associated with the second light-emitting unit have also changed. In addition, the third reflector 12 is located between the light-raising mirror 14 and the polarization beam combining prism 13. In this way, the light beam emitted by the first light-emitting unit first passes through the light-raising mirror 14 to reduce the height of the central light spot, and then is reflected by the third reflector 12 to the polarization beam combining prism 13, where it is polarization-combined with the light beam emitted by the second light-emitting unit.

[0072] Example 5

[0073] This embodiment differs from embodiment 4 in that, Figures 12 to 14 As shown, the beam combining unit includes a third reflector 12, a polarization beam combining prism 13, a light raising mirror 14 and a beam expander 15. The beam expander 15 is used to expand the diameter of the light beam emitted by the second light emitting unit.

[0074] Specifically, the light beam emitted by the first light-emitting unit passes through the light-raising mirror 14 to lower the height of the central light spot, and then is emitted to the polarization beam combining prism 13. The light beam emitted by the second light-emitting unit first passes through the beam expander 15 to increase the diameter of the central light spot to the same diameter as the central light spot emitted by the first light-emitting unit. The expanded light beam is reflected by the third reflector 12 to the polarization beam combining prism 13, and is polarization-combined with the light beam emitted by the first light-emitting unit. The polarization-combined light beam is directly coupled into the optical fiber 5 through the focusing lens 16.

[0075] Of course, in other embodiments, when the diameter of the central light spot emitted by the first light emitting unit is too small, a beam expander may be used to increase the diameter of the central light spot.

[0076] Example 6

[0077] This embodiment is different from embodiment 1 in that Figures 15 to 17 As shown, the beam combining unit includes a third reflecting mirror 12 , a polarization beam combining prism 13 , a light raising mirror 14 , a fourth reflecting mirror 19 and a fifth reflecting mirror 20 .

[0078] Specifically, the light beam emitted by the first light-emitting unit passes through the light-raising mirror 14 to lower the height of the central light spot, and then is emitted to the polarization beam combining prism 13. The light beam emitted by the second light-emitting unit is reflected by the third reflector 12 to the polarization beam combining prism 13, and is polarization-combined with the light beam emitted by the first light-emitting unit. The polarization-combined light beam passes through the fourth reflector 19 and the fifth reflector 20 in sequence and is reflected to the focusing lens 16, and then is coupled into the optical fiber 5 through the focusing lens 16. In this way, the direction of the polarization-combined light beam can be changed by setting multiple reflectors, thereby meeting the needs of setting optical fibers 5 in different directions. In addition, a Bragg grating 21 is also provided on the optical path of the second light-emitting unit. The Bragg grating 21 is located between the second fast-axis collimating lens 9 and the second slow-axis collimating lens 10. The Bragg grating 21 can play a role in filtering and stabilizing the wavelength. Of course, in other embodiments, a Bragg grating can also be provided on the optical path of the first light-emitting unit.

[0079] Example 7

[0080] This embodiment is different from embodiment 1 in that Figures 18 to 20 As shown, each first tube core 2 is located on the same inclined plane, each second tube core 3 is located on the same horizontal plane, and the first reflector 8 and the second reflector 11 are inclined at a certain angle, so that the light beams emitted by each first tube core 2 can be combined in the fast axis direction by the first reflector 8, and the light beams emitted by the second tube core 3 can be combined in the fast axis direction by the second reflector 11. In this way, each first tube core 2 and each second tube core 3 do not need to be arranged on the base 1 with a stepped structure, making the structure of the entire laser pump source simpler.

[0081] The above description is only a specific embodiment of the present invention. Under the above teachings of the present invention, those skilled in the art may make other improvements or modifications based on the above embodiments. Those skilled in the art should understand that the above description is only to better explain the purpose of the present invention, and the scope of protection of the present invention shall be based on the scope of protection of the claims.

Claims

1. A laser pump source, characterized in that: The base and the first light emitting unit, the second light emitting unit, the beam combining unit and the coupling unit arranged on the base; the first light emitting unit comprises at least one first die, the second light emitting unit comprises at least one second die, each of the first die and each of the second die are arranged side by side in the same direction in a horizontal plane; The first light emitting unit and / or the second light emitting unit are arranged obliquely in the direction of the outgoing light beam, so that the light outlet of the first light emitting unit and the light outlet of the second light emitting unit are located at different heights, and a light compression mirror is arranged on the light path of the obliquely arranged first light emitting unit and / or the second light emitting unit, the light compression mirror is used for compressing the oblique light emitted by the first light emitting unit and / or the second light emitting unit into horizontal light; The beam combining unit is used for polarized beam combining of the light beams emitted by the first light emitting unit and the second light emitting unit, and the coupling unit is used for coupling the polarized beam combined light beams into an optical fiber.

2. The laser pump source of claim 1, wherein, The first light emitting unit is inclined upward by a first preset angle in the direction of the outgoing light beam, and the second light emitting unit is inclined downward by a second preset angle in the direction of the outgoing light beam.

3. The laser pump source of claim 1, wherein, The first light emitting unit is arranged on a stepped structure, each of the first dies is arranged on different steps, the second light emitting unit is arranged on another stepped structure, and each of the second dies is arranged on different steps.

4. The laser pump source of claim 1, wherein, The light beams emitted by the first light emitting unit and the second light emitting unit are in the same direction or in the opposite direction.

5. The laser pump source of claim 4, wherein, A first fast-axis collimating lens, a first slow-axis collimating lens and a first mirror are arranged at the light outlet of the first die, so that the light beam emitted by the first die passes through the first fast-axis collimating lens, the first slow-axis collimating lens and the first mirror in sequence to reach the beam combining unit; A second fast-axis collimating lens, a second slow-axis collimating lens and a second mirror are arranged at the light outlet of the second die, so that the light beam emitted by the second die passes through the second fast-axis collimating lens, the second slow-axis collimating lens and the second mirror in sequence to reach the beam combining unit; The first slow-axis collimating lens and the second slow-axis collimating lens are arranged at different heights, and the first mirror and the second mirror are arranged at different heights.

6. The laser pump source of claim 5, wherein, The first slow-axis collimating lens and the second slow-axis collimating lens are arranged in vertical overlap, the first mirror is located between the second fast-axis collimating lens and the second slow-axis collimating lens, and the second mirror is located between the first fast-axis collimating lens and the first slow-axis collimating lens.

7. The laser pump source of claim 1, wherein, The beam combining unit comprises a third mirror, a polarized beam combining prism and a light raising mirror; The third mirror is used for changing the direction of the light beam emitted by the first light emitting unit or the second light emitting unit, the light raising mirror is used for changing the height of the central light spot emitted by the first light emitting unit or the second light emitting unit, so that the heights of the central light spots emitted by the first light emitting unit and the second light emitting unit are consistent, and the polarized beam combining prism is used for polarized beam combining of the light beams emitted by the first light emitting unit and the second light emitting unit.

8. The laser pump source of claim 7, wherein, The beam combining unit further comprises a beam expander; The expansion mirror is used for expanding the diameter of the light beam emitted by the first light emitting unit or the second light emitting unit.

9. The laser pump source of any of claims 1-8, wherein, The coupling unit comprises a focusing lens.

10. The laser pump source of any of claims 1-8, wherein, The coupling unit comprises a slow-axis focusing mirror and a fast-axis focusing mirror.

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