Laser optical coupling device

Abstract

The invention discloses a laser optical coupling device, comprising a base, a first laser unit and a second laser unit; the adjacent first laser unit and the second laser unit are staggered in the first direction and face oppositely in the second direction; the laser unit comprises a laser, a fast axis collimating lens, a slow axis collimating lens and a first reflector arranged in sequence in the second direction. In the first laser unit, a first spacing is formed between an end face of the laser away from the fast axis collimating lens and the slow axis collimating lens; in the second laser unit, a second spacing is formed between an end face of the laser away from the fast axis collimating lens and the slow axis collimating lens; the projection of the first spacing and the second spacing in the second direction has an overlapping area. The length of the overlapping area is m, the total width of the laser coupling module on the base is L=2d+2e+2a+2c-m, the total width of the existing laser coupling module is L0=2a+2c+b+2d+2e, L0-L=b+m, then L<L0, so that the space occupied by the laser coupling module on the base is small and the structure is compact.

Description

Technical Field

[0001] The invention relates to the technical field of semiconductor lasers, and in particular to an optical coupling device of a laser. Background Art

[0002] Fiber lasers are currently widely used in various fields due to their high brightness, good monochromaticity and good coherence. Fiber lasers are usually composed of seed light, fiber-coupled pump modules, active fibers and fiber Bragg gratings. The fiber-coupled pump module is responsible for providing energy to the fiber laser. Currently, the commonly used technologies for fiber-coupled pump modules are spatial beam combining and polarization beam combining.

[0003] For example, a laser fiber-coupled packaging device disclosed in the prior art, such as Figure 1 As shown, it includes a base 1, a front laser group and a rear laser group symmetrically and arranged side by side on the base 1, a second reflector 6 and a polarizing lens 10. The internal structure and arrangement of the front laser group and the rear laser group are the same. The front laser group includes a plurality of laser units arranged in a step-by-step manner from left to right and gradually from top to bottom; each laser unit includes a laser, which is a laser chip, a fast axis collimating lens arranged on the light-emitting surface of the laser, a slow axis collimating lens corresponding to the fast axis collimating lens, and a first reflector arranged on the light-emitting path of the slow axis collimating lens, the first reflector reflects the light irradiated from the slow axis collimating lens to the second reflector 6, and then reflects it to the polarizing lens 10 through the second reflector; and the first reflector in each laser chip unit of the rear laser chip group directly reflects the light irradiated from the slow axis collimating lens to the polarizing lens 10, and through the action of the polarizing lens 10, the lasers emitted by the lasers in the front laser group and the rear laser group are irradiated to the focusing lens, thereby realizing beam combination. For ease of expression, the laser, fast-axis collimating lens, slow-axis collimating lens and first reflector in the front row of laser units are respectively expressed as the first laser 21, the first fast-axis collimating lens 31, the first slow-axis collimating lens 41 and the first reflector I51; the laser, fast-axis collimating lens, slow-axis collimating lens and first reflector in the back row of laser units are respectively expressed as the second laser 22, the second fast-axis collimating lens 32, the second slow-axis collimating lens 42 and the first reflector II52.

[0004] In the above-mentioned laser fiber coupling packaging device, Figure 1As shown, in the front laser unit and the rear laser unit facing each other in the rear laser group and the front laser group, the distance between the adjacent first laser 21 and the second laser 22 is b; in each laser unit, taking the front laser unit as an example, in the width direction of the base, the sum of the length of the first laser 21, the thickness of the first fast axis collimating lens 31 corresponding to it, and the distance between the light-emitting surface of the first laser 21 and the first fast axis collimating lens 31 is c; the distance between the first fast axis collimating lens 31 and the first slow axis collimating lens 32 is a, the thickness of the first slow axis collimating lens 41 is e, and the distance between the outermost end of the first reflector I51 and the outermost end of the corresponding first slow axis collimating lens 41 is d. Then, in the entire laser coupling package device, the total width L0 of the laser coupling module is 2a+2c+b+2d+2e, so that the laser coupling module occupies a large space in the width direction of the base and the structure is not compact. Summary of the invention

[0005] In the existing laser optical coupling device to be solved by the present invention, the laser coupling module occupies a large space in the width direction of the base and has a non-compact structure.

[0006] To this end, the present invention provides a laser light coupling device, comprising:

[0007] Pedestal;

[0008] At least one first laser unit and at least one second laser unit are disposed on the base, wherein adjacent first laser units and second laser units are staggered in a first direction and face opposite directions in a second direction perpendicular to the first direction;

[0009] Any of the laser units comprises a laser, a fast axis collimating lens, a slow axis collimating lens and a first reflector arranged in sequence along the second direction, the fast axis collimating lens is arranged on the light exiting surface of the laser, the light incident surface of the slow axis collimating lens corresponds to the light exiting surface of the fast axis collimating lens, and the reflective surface of the first reflector corresponds to the light exiting surface of the slow axis collimating lens; the laser in the first laser unit and the laser in the second laser unit are located between the slow axis collimating lens in the first laser unit and the slow axis collimating lens in the second laser unit;

[0010] In the first laser unit, a first distance is formed between an end face of the laser away from the fast-axis collimating lens and the slow-axis collimating lens; in the second laser unit, a second distance is formed between an end face of the laser away from the fast-axis collimating lens and the slow-axis collimating lens; the projections of the first distance and the second distance in the second direction have an overlapping area.

[0011] Optionally, in the above-mentioned laser optical coupling device, projections of the laser in the first laser unit and the laser in the second laser unit in the second direction are staggered.

[0012] Further optionally, in the above-mentioned optical coupling device of the laser, in the adjacent first laser unit and the second laser unit, the first laser unit and the second laser unit are arranged in the staggered manner by staggering the light emitting surface of the laser in the first laser unit and the light emitting surface of the laser in the second laser unit in the first direction.

[0013] Optionally, in the above-mentioned laser optical coupling device, in the adjacent first laser unit and second laser unit, the projections of the portion of the laser in the first laser unit avoiding its light-emitting surface and the portion of the laser in the second laser unit avoiding its light-emitting surface in the first direction have an overlapping area.

[0014] Optionally, in the above-mentioned laser optical coupling device, there are at least two first laser units, and in the first direction, the first laser unit at the starting end and the first laser unit at the end are arranged in a step-like manner from top to bottom; and / or

[0015] There are at least two second laser units, and in the first direction, the second laser unit at the starting end and the second laser unit at the end are arranged in a stepped manner from top to bottom; the first laser unit at the starting end and the second laser unit at the starting end are located on the same side.

[0016] Optionally, in the above-mentioned laser optical coupling device, the first laser units and the second laser units are arranged alternately in sequence in the first direction.

[0017] Optionally, in the above-mentioned laser optical coupling device, the base is provided with steps corresponding to the first laser unit or the second laser unit one by one; and the step surface of the same step is provided with adjacent first laser units and second laser units.

[0018] Optionally, in the above-mentioned optical coupling device of the laser, a first boss and a second boss staggered along a first direction are provided on the step surface of the same step;

[0019] The lasers in the first laser unit and the second laser unit on the same step are respectively arranged on the first boss and the second boss.

[0020] Optionally, the above-mentioned laser optical coupling device further comprises a second reflector and a beam splitter arranged outside the last laser unit, wherein the beam splitter has a first incident surface and a second incident surface adjacent to the first incident surface;

[0021] One of the reflective surface of the second reflector and the first incident surface of the beam splitter is used to receive the light reflected by the first reflector of the first laser unit, and the other is used to receive the light reflected by the first reflector of the second laser unit, and the reflective surface of the second reflector corresponds to the second incident surface of the beam splitter; and

[0022] A focusing lens is arranged on the optical path of the light emitting surface of the beam splitter opposite to the first incident surface; and an optical fiber is arranged on the focusing point behind the focusing lens.

[0023] Optionally, in the above-mentioned optical coupling device of the laser, the beam splitter is a dichroic mirror, or the beam splitter is a polarization beam splitter, and a half-wave plate is provided on the second incident surface of the beam splitter.

[0024] The technical solution of the present invention has the following advantages:

[0025] 1. The optical coupling device of a laser provided by the present invention comprises a base, at least one first laser unit and at least one second laser unit arranged on the base; the adjacent first laser unit and the second laser unit are staggered in a first direction and face opposite directions in a second direction perpendicular to the first direction; any of the laser units comprises a laser, a fast axis collimating lens, a slow axis collimating lens and a first reflecting mirror arranged in sequence along the second direction, the fast axis collimating lens is arranged on the light exiting surface of the laser, the light incident surface of the slow axis collimating lens corresponds to the light exiting surface of the fast axis collimating lens, and the reflecting surface of the first reflecting mirror corresponds to the light exiting surface of the slow axis collimating lens; the laser in the first laser unit and the laser in the second laser unit are located between the slow axis collimating lens in the first laser unit and the slow axis collimating lens in the second laser unit.

[0026] In the optical coupling device of the laser of this structure, in the first laser unit, a first distance is formed between the end face of the laser away from the fast-axis collimating lens and the slow-axis collimating lens; in the second laser unit, a second distance is formed between the end face of the laser away from the fast-axis collimating lens and the slow-axis collimating lens; the projections of the first distance and the second distance in the second direction have an overlapping area. Assuming that the length of the overlapping area is m, the total width of the laser coupling module on the base is L=2d+2e+L1+L2-m=2d+2e+2a+2c-m. Since the total width of the laser coupling module on the base in the background technology is L0=2a+2c+b+2d+2e, L0-L=(2a+2c+b+2d+2e)-(2d+2e+2a+2c-m)=b+m. Since b>0, m>0, L<L0, that is, the width of the laser coupling module of the present application in the width direction of the base is smaller than the width of the existing laser coupling module in the width direction of the base, so that the space occupied by the laser coupling module of the present application on the base is small and the structure is compact.

[0027] 2. In the optical coupling device of the laser provided by the present invention, the projections of the laser in the first laser unit and the laser in the second laser unit in the second direction are staggered, so that the length m of the overlapping area of ​​the projections of the first spacing and the second spacing in the second direction is larger, and then L is smaller than L0, further making the laser coupling module of the present application occupy a smaller space on the base and a more compact structure.

[0028] 3. In the optical coupling device of the laser provided by the present invention, in the adjacent first laser unit and the second laser unit, the first laser unit and the second laser unit are arranged in the staggered manner by staggering the light emitting surface of the laser in the first laser unit and the light emitting surface of the laser in the second laser unit in the first direction; further, in the adjacent first laser unit and the second laser unit, the projections of the portion of the laser in the first laser unit avoiding the light emitting surface and the portion of the laser in the second laser unit avoiding the light emitting surface in the first direction have an overlapping area, so that the light emitting surface of the laser of the second laser unit is just located between the two lasers of the two adjacent first laser units in the first direction, then in the first direction, the length of the laser coupling module is the sum of the third distance between the starting end of the starting end laser in the first laser unit and the ending end of the ending laser, and the length of the ending laser in the second laser unit extending out of the ending laser of the first laser unit, so that the length of the laser coupling module along the first direction is reduced, the arrangement of the laser coupling module in the first direction and the second direction is more compact, and the space occupied by the entire laser coupling module on the base is smaller.

[0029] 4. In the optical coupling device of the laser provided by the present invention, there are at least two first laser units, and in the first direction, the first laser unit at the starting end to the first laser unit at the end are arranged in a step-like manner from top to bottom, and / or there are at least two second laser units, and in the first direction, the second laser unit at the starting end to the second laser unit at the end are arranged in a step-like manner from top to bottom; the first laser unit at the starting end and the second laser unit at the starting end are located on the same side, so that the lasers in the multiple first laser units and the second laser units are combined at different heights, thereby improving the quality and brightness of the combined lasers. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0031] Figure 1 It is a schematic diagram of the structure of the optical coupling device of the laser in the prior art (viewed from above);

[0032] Figure 2 A schematic diagram of the structure of the optical coupling device of the laser provided in an embodiment of the present application (viewed from above and rotated 90 degrees to the right);

[0033] Figure 3 for Figure 2 A partial enlarged view of the optical coupling device of the laser;

[0034] Figure 4 for Figure 3 Schematic diagram of the three-dimensional structure of the optical coupling device of the laser;

[0035] Figure 5 This is a schematic structural diagram of the optical coupling device of the laser provided in this embodiment (viewed from top).

[0036] Description of reference numerals:

[0037] 1 - base; 21 - first laser; 22 - second laser; 31 - first fast axis collimating lens; 32 - second fast axis collimating lens; 41 - first slow axis collimating lens; 42 - second slow axis collimating lens; 51 - first reflector I; 52 - first reflector II; 6 - second reflector; 7 - beam splitter; 8 - focusing lens; 9 - optical fiber; 10 - polarizing lens. DETAILED DESCRIPTION

[0038] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0040] Example 1

[0041] This embodiment provides a laser optical coupling device, such as Figures 2 to 5 As shown, it includes a base 1, a plurality of first laser units, a plurality of second laser units, a second reflecting mirror 6, a beam splitter 7, a focusing lens 8 and an optical fiber 9.

[0042] A plurality of first laser units and a plurality of second laser units are disposed on the base 1, and the length direction of the base 1 is used as the first direction ( Figure 3 The width direction of the base 1 is a second direction perpendicular to the first direction ( Figure 3 The first laser unit and the second laser unit are staggered in the first direction and face opposite directions in the second direction. For example, the first laser units are located Figure 3 In the front row, multiple second laser units are located Figure 3 In the back row.

[0043] For example, the number of the first laser unit is seven, and the number of the second laser unit is also seven. The specific number can also be other numbers. The number of the first laser unit and the second laser unit can be different or the same. Optimally, the number of the first laser unit and the second laser unit is the same, such as Figure 2 As shown, the first laser units and the second laser units are alternately arranged in sequence on the base 1 in the first direction.

[0044] In the first direction, a plurality of first laser units are arranged on the base 1 from the first laser unit at the starting end ( Figure 3 The leftmost end of the laser unit ( Figure 3 Similarly, in the first direction, the plurality of second laser units are arranged in a ladder-like manner from the second laser unit at the starting end ( Figure 3 The leftmost end of the laser unit ( Figure 3 The first laser unit at the starting end and the second laser unit at the starting end are located on the same side, so that the multiple first laser units are staggered in height, and the multiple second laser units are staggered in height, which is convenient for combining the multiple first laser units and the multiple second laser units.

[0045] In order to arrange the first laser unit and the second laser unit in a stepped manner, the base 1 is provided with steps (not shown in the figure) corresponding to the number of the first laser units or the second laser units; adjacent first laser units and second laser units are provided on the step surface of the same step.

[0046] For example, the first laser unit and the second laser unit are both seven, and correspondingly, the base 1 is provided with Figure 3 From the left to Figure 3 There are seven steps arranged sequentially from top to bottom at the middle right end, and a first laser unit and a second laser unit are provided on the step surface of each step, so that a plurality of first laser units and second laser units are arranged in a stepped manner.

[0047] The first laser unit and the second laser unit have the same internal structure. Figure 2 and Figure 3 As shown, the internal structure of the laser unit is explained by taking the first laser unit as an example. The first laser unit includes a laser, a fast-axis collimating lens, a slow-axis collimating lens and a first reflector arranged in sequence along the second direction. The fast-axis collimating lens is disposed on the light-emitting surface of the laser, the light-incident surface of the slow-axis collimating lens corresponds to the light-emitting surface of the fast-axis collimating lens, and the reflecting surface of the first reflector corresponds to the light-emitting surface of the slow-axis collimating lens.

[0048] For the sake of convenience, the laser, fast-axis collimating lens, slow-axis collimating lens and first reflector in the first laser unit are respectively expressed as the first laser 21, the first fast-axis collimating lens 31 and the first slow-axis collimating lens 41; the first reflector I51; the laser, fast-axis collimating lens, slow-axis collimating lens and first reflector in the second laser unit are respectively expressed as the second laser 22, the second fast-axis collimating lens 32, the second slow-axis collimating lens 42 and the first reflector II52.

[0049] Among them, the first laser 21, the first fast axis collimating lens 31, the first slow axis collimating lens 41 and the first reflector I51 in the first laser unit are arranged from front to back in the second direction, and the second laser 22, the second fast axis collimating lens 32, the second slow axis collimating lens 42 and the first reflector II52 in the second laser unit are arranged from back to front in the second direction, so that the first laser unit and the second laser unit are arranged in opposite directions on the base 1, and the first laser 21 in the first laser unit and the second laser 22 in the second laser unit are located between the first slow axis collimating lens 41 in the first laser unit and the second slow axis collimating lens 42 in the second laser unit.

[0050] In addition, a first boss and a second boss (not shown in the figure) staggered in the first direction and protruding upward are provided on the step surface of each step of the base 1; the first laser 21 of the first laser unit and the second laser 22 of the second laser unit on the same step are respectively provided on the first boss and the second boss, which facilitates the installation and positioning of the first laser 21 and the second laser 22. Optionally, in this embodiment, both the first laser 21 and the second laser 22 can use diode laser chips.

[0051] like Figure 2 and Figure 3 As shown, in the first laser unit, an end face ( Figure 3 The front end face of the first laser in the laser beam) and the first slow axis collimating lens 41 ( Figure 3 The first spacing formed between the front end face of the first slow axis collimating lens in the second laser unit is L1; in the second laser unit, the end face of the second laser 22 away from the second fast axis collimating lens 32 ( Figure 3 The rear end face of the second laser in the middle) and the second slow axis collimating lens 42 ( Figure 3 The second spacing formed between the rear end face of the second slow axis collimating lens in the middle is L2; ​​the projections of the first spacing and the second spacing in the second direction have an overlapping area, such as Figure 3 The length of the overlapping area is m.

[0052] Assume that in each laser unit, taking the first laser unit as an example, in the second direction, the sum of the length of the first laser 21, the thickness of the corresponding first fast-axis collimating lens 31, and the distance between the light-emitting surface of the first laser 21 and the first fast-axis collimating lens 31 is c. The first fast-axis collimating lens 31 is fixed on the light-emitting surface of the first laser 21, and the distance between the light-emitting surface of the first laser 21 and the first fast-axis collimating lens 31 is the distance of the back focal length of the first fast-axis collimating lens 31. The distance between the first fast-axis collimating lens 31 and the first slow-axis collimating lens 41 is a, the thickness of the first slow-axis collimating lens 41 is e, the distance between the outermost end of the first reflector 151 and the outermost end of the first slow-axis collimating lens 41 is d, and the length of the overlapping area of ​​the first spacing and the second spacing is m. Figure 2 and Figure 3 It can be known that L1=L2=a+c, so the total width of the laser coupling module on the base in this embodiment is L=2d+2e+L1+L2-m=2d+2e+2a+2c-m. Since the total width of the laser coupling module on the base in the background technology is L0=2a+2c+b+2d+2e, then L0-L=(2a+2c+b+2d+2e)-(2d+2e+2a+2c-m)=b+m. Since b>0, m>0, L<L0, that is, the width of the laser coupling module in the width direction of the base 1 in this embodiment is smaller than the width of the existing laser coupling module in the width direction of the base 1, so that the laser coupling module of this embodiment occupies a small space on the base 1 and has a compact structure.

[0053] like Figure 2 and Figure 3 As shown, further, the projections of the first laser 21 in the first laser unit and the second laser 22 in the second laser unit in the second direction are staggered, so that the length m of the overlapping area of ​​the projections of the first spacing L1 and the second spacing L2 in the second direction is larger, and then L is smaller relative to L0, further making the laser coupling module of this embodiment occupy a smaller space on the base 1 and the structure more compact.

[0054] like Figure 2 As shown, the first laser unit and the second laser unit are staggered in arrangement because the light emitting surface of the first laser 21 in the first laser unit and the light emitting surface of the second laser 22 in the second laser unit are staggered in the first direction.

[0055] For example, the projections of the portion of the first laser 21 in the first laser unit that avoids the light emitting surface thereof and the portion of the second laser 22 in the second laser unit that avoids the light emitting surface thereof in the first direction have an overlapping area, so that the light emitting surface of the second laser 22 of the second laser unit in the first direction is just located between the two first lasers 21 of the two adjacent first laser units. Then, in the first direction, the length of the laser coupling module is the starting end of the first laser 21 in the first laser unit ( Figure 3 The end of the first laser 21 ( Figure 3 The sum of a third distance L3 between the middle and right ends of the laser unit and a length L4 of the second laser 22 at the middle end of the second laser unit extending out of the first laser 21 at the end of the first laser unit, thereby reducing the length of the laser coupling module on the base along the first direction, and thus the arrangement of the laser coupling module in the first and second directions is more compact, and the space occupied by the entire laser coupling module on the base 1 is smaller.

[0056] like Figure 2 and Figure 4 As shown, the second reflector 6 and the beam splitter 7 are arranged outside the last laser unit. For example, the second reflector 6 and the beam splitter 7 are arranged outside the last second laser unit ( Figure 4 The beam splitter 7 has a first incident surface 71 and a second incident surface 72 adjacent to the first incident surface, and the light exiting surface of the beam splitter 7 is opposite to the first incident surface. For example, the beam splitter 7 is a dichroic mirror, and an anti-reflection film and a multi-layer dielectric film are respectively disposed on the first incident surface and the second incident surface of the dichroic mirror.

[0057] Among them, the second reflector 6 is arranged at the outermost side of the second laser unit at the end, and its reflective surface is used to receive the light reflected by the first reflector II52 of all the second laser units, that is, the reflective surfaces of all the first reflectors II52 correspond to the reflective surface of the second reflector; the dichroic mirror is arranged on the outer side of the first laser unit at the end, and its first incident surface is used to receive the light reflected by the first reflector I51 of all the first laser units; at the same time, the reflective surface of the second reflector 6 corresponds to the second incident surface of the beam splitter 7, and the light reflected by the second reflector 6 is all irradiated on the second incident surface, so that the light reflected by the first reflector I51 of the first laser unit and the first reflector II52 of the second laser unit are all combined and irradiated through the light output surface of the dichroic mirror.

[0058] like Figure 4 and Figure 5As shown, the focusing lens 8 is arranged on the optical path of the light-emitting surface of the beam splitter 7; the optical fiber 9 is arranged at the focusing point behind the focusing lens 8, so that the light irradiated by the dichroic mirror is focused by the focusing lens 8 to form coupled light and enters the optical fiber 9, thereby realizing the combination of the lasers of multiple first laser units and multiple second units, thereby improving the quality and power of the laser after the laser light coupling device combines the lasers.

[0059] Since the beam splitter 7 in this embodiment is a dichroic mirror, it can combine laser beams of different wavelengths, so the wavelengths of the laser beams emitted by the first laser 21 in the first laser unit and the second laser 22 in the second laser unit are different. To better understand the beam combining process, Figure 5 As shown, from left to right (due to Figure 5 Rotate 90 degrees to the right, then the corresponding Figure 5 For the combined beam of the fourth first laser unit and the fourth second laser unit (from top to bottom in the figure), the first laser 21 in the first laser unit emits a laser of the first wavelength, Figure 5 The thin solid arrow in the middle shows the direction of the laser. The laser is first collimated by the first fast-axis collimating lens 31 in the fast-axis direction. The laser after the first collimation passes through the gap between the second laser 22 of the third second laser unit in the rear row and the second laser 22 of the fourth second laser unit, and is irradiated onto the first slow-axis collimating lens 41. It is then collimated for the second time on the slow axis by the first slow-axis collimating lens 41 to form a completely collimated light. The completely collimated light is immediately irradiated onto the first reflector I51, reflected by the first reflector I51, and then irradiated onto the second reflector 6. It is then reflected by the second reflector 6 and irradiated onto the second incident surface 72 of the dichroic mirror. After being emitted from the dichroic mirror, it is irradiated onto the focusing lens 8, and then focused into the optical fiber 9 by the focusing lens 8.

[0060] Similarly, the second laser 22 in the fourth second laser unit emits a laser of the second wavelength, Figure 5 The thick solid arrow shows the direction of the laser. After being collimated by the second fast-axis collimating lens 32 in turn, the laser passes through the gap between the first laser 21 of the fourth first laser unit in the front row and the first laser 21 of the fifth first laser unit, and then irradiates the second slow-axis collimating lens 42 to be collimated to form a completely collimated light. The completely collimated light is reflected by the first reflector II52 and directly irradiates the first incident surface 71 of the dichroic mirror. After being emitted from the dichroic mirror, it is irradiated onto the focusing lens 8, and after being focused by the focusing lens 8, it is irradiated into the optical fiber 9, thereby realizing the process of combining lasers of different wavelengths in the optical fiber.

[0061] In addition, it should be noted that: when a dichroic mirror is used, since the first laser 21 in the first laser unit and the second laser 22 in the second laser unit emit lasers of different wavelengths, the corresponding distance between the first fast-axis collimating lens 31 and the first slow-axis collimating lens 41 in the first laser unit is different from the distance between the second fast-axis collimating lens 32 and the second slow-axis collimating lens 42 in the second laser unit. For example, the two distances are a1 and a2 respectively, then the above-mentioned L1=a1+c, L2=a2+c, and at this time the width of the laser coupling module L=2d+2e+L1+L2-m=2d+2e+2c+a1+a2-m.

[0062] Then when the lasers of the two laser units of the laser coupler in the background technology also emit lasers of different wavelengths. Assuming that the first laser 21 and the second laser 22 of the two laser units in the background technology emit lasers of different wavelengths (corresponding to the first laser 21 and the second laser 22 of the two laser units in this embodiment emitting two lasers of different wavelengths), the distance between the first fast axis collimating lens 31 and the first slow axis collimating lens 41 in the first laser unit is a1; the distance between the second fast axis collimating lens 32 and the first slow axis collimating lens 41 in the second laser unit is a2, then the total width L0 of the laser coupling module on the base in the background technology is L0=a1+a2+2c+b+2d+2e, then L0-L=b+m, and L<L0 is still obtained, so that the structure of the laser coupling module in the width direction of the base is compact.

[0063] As a first replaceable implementation of Example 1, the above-mentioned dichroic mirror can also be replaced by a polarization beam splitter cube. In this case, a half-wave plate is provided on the second incident surface 72 of the polarization beam splitter cube. In this case, the laser beams of the same wavelength emitted by the first laser 21 of the first laser unit and the second laser 22 of the second laser unit are combined. In the beam combining process, the light reflected by the first reflector I51 of the first laser unit is directly irradiated on the first incident surface 71 of the polarization beam splitter cube, and after passing through the polarization cube, it is irradiated on the focusing lens 8 and focused and then input into the optical fiber 9; the light reflected by the first reflector II52 of the second laser unit is still irradiated on the second reflector 6 first, and after being reflected by the second reflector 6, it is irradiated on the half-wave plate. After the polarization state of the light is changed by the half-wave plate, it is irradiated on the polarization cube and reflected, and then irradiated on the focusing lens 8, and then focused into the optical fiber 9 by the focusing lens 8, so as to realize the beam combining process of laser beams of the same wavelength.

[0064] As an alternative implementation of the above-mentioned embodiment, the settings of the above-mentioned second reflector 6 and the beam splitter 7 can be swapped, and the second reflector 6 receives the light reflected by the first reflector I51 of all the first laser units; the light reflected by the second reflector 6 is then irradiated onto the second incident surface of the beam splitter 7; correspondingly, the light reflected by the first reflector II52 of the second laser unit is directly irradiated onto the first incident surface of the beam splitter 7.

[0065] As an alternative implementation of the above embodiment, the first and second bosses may not be provided on the step surface of the same step, and the first laser of the first laser unit and the second laser of the second laser unit may be directly provided on the step surface.

[0066] As an alternative implementation of the above embodiment, the first laser unit and the second laser unit may not be arranged alternately in sequence in the first direction. For example, there are two first laser units and one second laser unit, and the two first laser units are arranged in sequence, and then a second laser unit is arranged, or other arrangements are used. It is only necessary that the first laser unit and the second laser unit are staggered in the first direction and are in opposite directions in the second direction.

[0067] As an alternative implementation of the above embodiment, in the adjacent first laser unit and the second laser unit, the projections of the portion of the first laser 21 in the first laser unit that avoids its light exit surface and the portion of the second laser 22 in the second laser unit that avoids its light exit surface in the first direction may not have an overlapping area, and in this case, the first laser 21 of the first laser unit and the second laser 22 of the second laser unit are completely staggered along the first direction. That is, in the adjacent first laser unit and the second laser unit, not only the light exit surface of the first laser 21 of the first laser unit and the light exit surface of the second laser 22 of the second laser unit are staggered in the first direction, but the entire lasers are staggered.

[0068] As an alternative implementation of the above embodiment, the projections of the first laser 21 in the first laser unit and the second laser 22 in the second laser unit in the second direction may not be misaligned. For example, the first laser 21 in the first laser unit and the second laser 22 in the second laser unit have an overlapping area in the second direction. In this case, the length of the overlapping area between the first spacing L1 and the second spacing L2 is reduced, but L<L0 is still maintained, so that the space occupied by the laser coupling module in the width direction of the base 1 is small and the structure is compact.

[0069] As a variation of the above embodiment, the base 1 may not be provided with the above-mentioned multiple steps. For example, the base 1 itself is a slope that slopes downward from left to right, and the multiple first laser units and the multiple second laser units may also be arranged in a stepped manner. Alternatively, as a variation, the number of the first laser units and the second laser units may also be other numbers, but when there are at least two first laser units, in the first direction, the first laser unit at the starting end and the first laser unit at the end are arranged in a stepped manner from top to bottom; similarly, there are at least two second laser units, in the first direction, the second laser unit at the starting end and the second laser unit at the end are arranged in a stepped manner from top to bottom; the first laser unit at the starting end and the second laser unit at the starting end are located on the same side. Of course, as a variation, the first laser unit and the second laser unit may also be one.

[0070] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A laser optical coupling device, characterized in that: include Base (1); At least one first laser unit and at least one second laser unit are arranged on the base (1), and the adjacent first laser units and second laser units are staggered in a first direction and face opposite directions in a second direction perpendicular to the first direction; Any of the laser units comprises a laser, a fast axis collimating lens, a slow axis collimating lens and a first reflector arranged in sequence along the second direction, the fast axis collimating lens is arranged on the light exiting surface of the laser, the light incident surface of the slow axis collimating lens corresponds to the light exiting surface of the fast axis collimating lens, and the reflective surface of the first reflector corresponds to the light exiting surface of the slow axis collimating lens; the laser in the first laser unit and the laser in the second laser unit are located between the slow axis collimating lens in the first laser unit and the slow axis collimating lens in the second laser unit; In the first laser unit, a first distance is formed between an end face of the laser away from the fast axis collimating lens and the slow axis collimating lens; in the second laser unit, a second distance is formed between an end face of the laser away from the fast axis collimating lens and the slow axis collimating lens; and the projections of the first distance and the second distance in the second direction have an overlapping area; The first laser (21), the first fast axis collimating lens (31), the first slow axis collimating lens (41) and the first reflector I (51) in the first laser unit are arranged from front to back in the second direction, and the second laser (22), the second fast axis collimating lens (32), the second slow axis collimating lens (42) and the first reflector II (52) in the second laser unit are arranged from back to front in the second direction; In the adjacent first laser unit and second laser unit, the projections of the portion of the laser in the first laser unit that avoids the light emitting surface thereof and the portion of the laser in the second laser unit that avoids the light emitting surface thereof in the first direction have an overlapping area; There are at least two first laser units, and in the first direction, the first laser unit at the starting end and the first laser unit at the end are arranged in a step-like manner from top to bottom; and / or There are at least two second laser units, and in the first direction, the second laser unit at the starting end and the second laser unit at the end are arranged in a step-like manner from top to bottom; the first laser unit at the starting end and the second laser unit at the starting end are located on the same side; The first laser units and the second laser units are alternately arranged in sequence in the first direction; The base (1) is provided with steps corresponding to the first laser unit or the second laser unit one by one; and the step surface of the same step is provided with adjacent first laser units and second laser units.

2. The optical coupling device of a laser according to claim 1, characterized in that: The projections of the laser in the first laser unit and the laser in the second laser unit in the second direction are staggered.

3. The optical coupling device of a laser according to claim 1 or 2, characterized in that: In the adjacent first laser unit and second laser unit, the first laser unit and the second laser unit are arranged in the staggered manner by staggering the light emitting surface of the laser in the first laser unit and the light emitting surface of the laser in the second laser unit in the first direction.

4. The optical coupling device of a laser according to claim 3, characterized in that: A first boss and a second boss staggered along a first direction are provided on the step surface of the same step; The lasers in the first laser unit and the second laser unit on the same step are respectively arranged on the first boss and the second boss.

5. The optical coupling device of a laser according to any one of claims 1 to 4, characterized in that: It also includes a second reflector (6) and a beam splitter (7) arranged outside the laser unit at the end, wherein the beam splitter (7) has a first incident surface and a second incident surface adjacent to the first incident surface; wherein one of the reflection surface of the second reflection mirror (6) and the first incident surface of the beam splitter (7) is used to receive light reflected by the first reflection mirror of the first laser unit, and the other is used to receive light reflected by the first reflection mirror of the second laser unit, and the reflection surface of the second reflection mirror (6) corresponds to the second incident surface of the beam splitter (7); and A focusing lens (8) is arranged on the optical path of the light output surface of the beam splitter (7) opposite to the first incident surface; and an optical fiber (9) is arranged on the focusing point behind the focusing lens (8).

6. The optical coupling device of a laser according to claim 5, characterized in that: The beam splitter (7) is a dichroic mirror, or the beam splitter (7) is a polarization beam splitter (7), and a half-wave plate is provided on the second incident surface of the beam splitter (7).

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