An integrated packaged laser

Abstract

The present invention proposes an integrated packaged laser, belonging to the technical field of optical path packaging structures. The laser comprises a housing; a red light source disposed at one end of the housing for outputting seed light in the red wavelength band; a first dichroic mirror disposed in the output optical path of the red light source for unidirectional transmission of the seed light; a pump source disposed at the other end of the housing for outputting the pump light; a gain fiber connected to the pump source optical path for amplifying the input pump light and then transmitting the amplified pump light into the housing; a second dichroic mirror disposed between the pump source and the gain fiber for unidirectional transmission of the pump light and directed toward the gain fiber; and a crystal assembly disposed in the housing between the red light source and the pump source for modulating the input amplified pump light and outputting the modulated light to the end of the first dichroic mirror remote from the red light source, where it is output out of the housing together with the seed light. By utilizing a fiberless integrated optical path, the present invention reduces fiber length and packaging difficulty.

Description

Technical Field

[0001] The present invention relates to the technical field of optical path packaging structures, and in particular to an integrated packaged laser. Background Art

[0002] In the red light optical path integration scheme of fiber lasers, the seed source, pump source, online isolator, combiner and other devices are usually packaged separately. This packaging method has the following shortcomings: 1. As the overall packaging volume of each optical path device continues to shrink, it is difficult to integrate the devices and connecting optical fibers into one. 2. Most existing combiners are made using a tapered solution, which will introduce uncontrollable factors to the degradation of beam quality, and the loss caused by tapering is difficult to control. 3. Online isolators usually have a small structural size, and fixed stress can easily cause deformation, shortening the service life of the online isolator. In addition, the fiber coupling itself has low efficiency.

[0003] Therefore, it is very necessary to propose an integrated packaged laser, which uses spatial coupling to inject red seed light and pump light into the optical fiber, reduce the number of optical fiber fusion splicing times, improve the fixing method of the online isolator, reduce the deformation caused by stress deformation and reduce the coupling efficiency, and meet the needs of laser miniaturization. Summary of the Invention

[0004] In view of this, the present invention proposes an integrated packaged laser that adopts a fiber-free tapered coupling method, reduces the use of optical fibers and the fiber fusion process, and is conducive to the miniaturization of the laser.

[0005] The present invention provides an integrated packaged laser, comprising:

[0006] The hollow box (1) has two ends along its length, namely a first end and a second end;

[0007] A red light source (2) is arranged in the housing (1) near the first end and is used to output seed light in the red light band;

[0008] A first dichroic mirror (3) is arranged on the output light path of the red light source (2) and is used to allow the seed light to be transmitted in one direction;

[0009] A pump source (4) is arranged inside the box (1) near the second end and is used to output pump light;

[0010] A gain optical fiber (5) is embedded in the housing (1), and the gain optical fiber (5) is located on the output optical path of the pump source (4) and is connected to the optical path of the pump source (4). The gain optical fiber (5) amplifies the input pump light and then sends the amplified pump light back into the housing (1) and toward the pump source (4).

[0011] A second dichroic mirror (6) is disposed inside the box (1) between the pump source (4) and the gain optical fiber (5), and is used to allow the pump light to pass unidirectionally and be emitted toward the gain optical fiber (5), and to reflect the pump light after gain output by the gain optical fiber (5);

[0012] A crystal assembly (7) is arranged in a housing (1) between a red light source (2) and a pump source (4), wherein an input end of the crystal assembly (7) is connected to a reflection light path of a second dichroic mirror (6), and an output end of the crystal assembly (7) is connected to a reflection light path of a first dichroic mirror (3). The crystal assembly (7) is used to modulate the input pump light after gain, output the modulated light to an end of the first dichroic mirror (3) away from the red light source (2), and output the modulated light to the outside of the housing (1) together with the seed light.

[0013] On the basis of the above technical solution, preferably, the crystal component (7) comprises at least two modulation units (70) arranged in sequence, and the optical paths of the at least two modulation units (70) are coaxially arranged.

[0014] Preferably, the at least two modulation units (70) each include a first birefringent crystal (71), a first half-wave plate (72), a first optical rotation crystal (73), and a second birefringent crystal (74) arranged in sequence, wherein the input end of the first birefringent crystal (71) is optically connected to the end of the second dichroic mirror (6) away from the pump source (4); the input end of the first half-wave plate (72) is optically connected to the output end of the first birefringent crystal (71); the output end of the first half-wave plate (72) is optically connected to the input end of the first optical rotation crystal (73); the output end of the first optical rotation crystal (73) is optically connected to the input end of the second birefringent crystal (74); and the output end of the second birefringent crystal (74) is optically connected to the input end of the first birefringent crystal (71) of the adjacent modulation unit (70) or to the end of the first dichroic mirror (3) away from the red light source (2).

[0015] Further preferably, the first birefringent crystal (71) and the second birefringent crystal (74) of the at least two modulation units (70) are both made of YV04, and their cross-sectional shapes are both 3mm×3mm squares, and the axial thickness of the first birefringent crystal (71) is not completely the same as the axial thickness of the second birefringent crystal (74); the first half-wave plate (72) is a rectangular parallelepiped with a cross-sectional size of 3mm×3mm, and is made of quartz crystal with a thickness of 0.0609mm; the first optical rotation crystal (73) is a cylinder with a diameter of 2.8mm, a material of TGG, a thickness of 14mm, and a Verdet constant of 40rad / T / m.

[0016] More preferably, the gain fiber (5) is an ytterbium-doped gain fiber; and the wavelength of the pump light output by the pump source (4) is 915 nm, 976 nm, or 980 nm.

[0017] On the basis of the above technical solution, preferably, a third dichroic mirror (8) is further included, the third dichroic mirror (8) is arranged between the red light source (2) and the first dichroic mirror (3), the third dichroic mirror (8) is located on the light output path of the red light source (2), the central axes of the first dichroic mirror (3) and the third dichroic mirror are arranged at an angle to the optical axis of the output light path of the red light source (2), and the central plane of the third dichroic mirror (8) is arranged parallel to the central plane of the first dichroic mirror (3).

[0018] Preferably, the end of the first dichroic mirror (3) close to the red light source (2) and the end of the third dichroic mirror (8) close to the red light source (2) are both provided with fully transparent films; the end of the first dichroic mirror (3) away from the red light source (2) and the end of the third dichroic mirror (8) away from the red light source (2) are both provided with reflective films; the end of the second dichroic mirror (6) close to the pump source (4) is provided with a fully transparent film, and the end of the second dichroic mirror (6) away from the pump source (4) is provided with a reflective film; the third dichroic mirror (8) isolates the amplified pump light that passes through the first dichroic mirror (3) and propagates toward the red light source (2).

[0019] Further preferably, the housing (1) comprises an integrated bottom plate (11) and a cover plate; the red light source (2), the pump source (4), the first dichroic mirror (3), the second dichroic mirror (6), the third dichroic mirror and the crystal assembly (7) are all fixedly arranged on the bottom plate (11); the gain optical fiber (5) is arranged on the side surface of the cover plate; the first birefringent crystal (71), the first half-wave plate (72), the first optical rotation crystal (73) and the second birefringent crystal (74) of at least two modulation units (70) are all provided with a mirror seat (12) and an end cover (13); the mirror seat (12) is fixedly connected to the bottom plate (11); a fitting surface is provided on the mirror seat (12) or the end cover (13); and a placement position for placing the first birefringent crystal (71), the first half-wave plate (72), the first optical rotation crystal (73) or the second birefringent crystal (74) is provided on the fitting surface.

[0020] More preferably, a plurality of through grooves (100) are provided on the bottom plate (11) of the red light source (2) or the pump source (4), the through grooves (100) are arranged horizontally through the bottom plate (11) along the light emitting direction of the red light source (2) or the pump source (4), and the aspect ratio of the through grooves (100) is 1:1.

[0021] Still further preferably, the number of the through slots (100) on the bottom plate (11) of the red light source (2) or the pump source (4) is an odd number, and the optical axis of the red light source (2) or the pump source (4) is located on the center plane of the through slot (100) at the middle position.

[0022] The integrated packaged laser provided by the present invention has the following advantages over the prior art:

[0023] (1) This solution uses spatial coupling inside the box to replace the fiber taper coupling in traditional fiber lasers, which optimizes the insertion loss and beam quality to a certain extent, reduces the total length of the fiber and the number of fusion points, and reduces the difficulty of packaging optical devices;

[0024] (2) The integrated bottom plate is combined with several through grooves, which is conducive to isolating stress and transmitting deformation generated by the red light source or pump source heating components, maintaining the stability of the optical path and the quality of the beam output. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0026] Figure 1 This is a structural block diagram of an integrated packaged laser of the present invention;

[0027] Figure 2 This is a three-dimensional diagram of an integrated packaged laser of the present invention with the cover of the box removed;

[0028] Figure 3 This is a top view of an integrated packaged laser of the present invention with the cover of the box removed;

[0029] Figure 4 for Figure 2 A three-dimensional diagram of the mirror mount and end cover in the exploded state.

[0030] Reference numerals: 1, housing; 2, red light source; 3, first dichroic mirror; 4, pump source; 5, gain fiber; 6, second dichroic mirror; 7, crystal assembly; 8, third dichroic mirror;

[0031] 70. Modulation unit; 71. First birefringent crystal; 72. First half-wave plate; 73. First optical rotation crystal; 74. Second birefringent crystal;

[0032] 11. Base plate; 12. Mirror base; 13. End cap; 100. Through slot. DETAILED DESCRIPTION

[0033] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described 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 making creative efforts are within the scope of protection of the present invention.

[0034] At present, it is difficult to integrate laser devices and connecting optical fibers. Most existing beam combiners are made by taper-drawing, which will introduce uncontrollable factors to the degradation of beam quality. In addition, the loss caused by taper-drawing is difficult to control, and the fixed stress of the online isolator is very easy to cause deformation. In view of this, Figure 1 As shown, the present invention provides an integrated packaged laser, comprising:

[0035] The two ends of the hollow box body 1 along the length extension direction are respectively a first end and a second end; the first end and the second end are respectively arranged opposite to each other.

[0036] The red light source 2 is arranged in the housing 1 near the first end, and is used to output seed light in the red light band; the seed light is red light with a wavelength of 660nm.

[0037] The first dichroic mirror 3 is arranged on the output light path of the red light source 2, and is used to make the seed light unidirectionally transmitted;

[0038] The pump source 4 is disposed inside the housing 1 near the second end and is used to output pump light. In this embodiment, the wavelength of the pump light output by the pump source 4 is 915 nm, 976 nm or 980 nm.

[0039] The gain fiber 5 is embedded in the housing 1 and is located in the output optical path of the pump source 4 and connected to the optical path of the pump source 4. The gain fiber 5 amplifies the input pump light and then sends the amplified pump light back into the housing 1 and toward the pump source 4. In this embodiment, the gain fiber 5 is an ytterbium-doped gain fiber. The input pump light is converted into 1064nm light and then output to the second dichroic mirror 6.

[0040] The second dichroic mirror 6 is disposed inside the housing 1 between the pump source 4 and the gain fiber 5, and is used to allow the pump light to unidirectionally transmit into the gain fiber 5 and reflect the amplified pump light output by the gain fiber 5;

[0041] The crystal assembly 7 is arranged in the box 1 between the red light source 2 and the pump source 4. The input end of the crystal assembly 7 is connected to the reflected light path of the second dichroic mirror 6, and the output end of the crystal assembly 7 is connected to the reflected light path of the first dichroic mirror 3. It is used to modulate the input amplified pump light and output the modulated light to the end of the first dichroic mirror 3 away from the red light source 2. The modulated light is output to the outside of the box 1 together with the seed light and coupled into the output optical fiber outside the box.

[0042] The crystal assembly 7 includes at least two modulation units 70 arranged in sequence, and the optical paths of the at least two modulation units 70 are arranged coaxially. The at least two modulation units 70 each include a first birefringent crystal 71, a first half-wave plate 72, a first optically active crystal 73, and a second birefringent crystal 74 arranged in sequence. The optical axes of the first birefringent crystal 71, the first half-wave plate 72, the first optically active crystal 73, and the second birefringent crystal 74 coincide with the optical path of the amplified pump light.

[0043] like Figure 2 、 Figure 3 and Figure 4 As shown, when two modulation units are used, in order to facilitate the distinction of the components of the two modulation units, the two different modulation units are represented by 70A and 70B respectively. The modulation unit 70A near the second dichroic mirror 6 includes a first birefringent crystal 71A, a first half-wave plate 72A, a first optically active crystal 73A, and a second birefringent crystal 74A arranged in sequence. The input end of the first birefringent crystal 71A is optically connected to the end of the second dichroic mirror 6 away from the pump source 4; the input end of the first half-wave plate 72A is optically connected to the output end of the first birefringent crystal 71A; the output end of the first half-wave plate 72A is optically connected to the input end of the first optically active crystal 73A; and the output end of the first optically active crystal 73A is optically connected to the second birefringent crystal 74A. 4A, the output end of the second birefringent crystal 74A is optically connected to the input end of the third birefringent crystal 71B of the adjacent modulation unit 70B, the output end of the third birefringent crystal 71B is optically connected to the input end of the second half-wave plate 72B, the output end of the second half-wave plate 72B is optically connected to the input end of the second optically active crystal 73B, the output end of the second optically active crystal 73B is optically connected to the input end of the fourth birefringent crystal 74B, and the output end of the fourth birefringent crystal 74B is optically connected to the end of the first dichroic mirror 3 away from the red light source 2. The number of modulation units can exceed two, but the preferred number is two. The drawings of this embodiment are not to be construed as limiting the number of modulation units in the solution.

[0044] Furthermore, the first birefringent crystal 71A, the second birefringent crystal 74A, the third birefringent crystal 71B, and the fourth birefringent crystal 74B of the two modulation units 70A and 70B are all made of YV04 and have a 3 mm × 3 mm square cross-section. The axial thickness of the first birefringent crystal 71A, the second birefringent crystal 74A, and the third birefringent crystal 71B is 9 mm, and the axial thickness of the fourth birefringent crystal 74B is 10 mm. The first half-wave plate 72A and the second half-wave plate 72B are rectangular parallelepipeds with a 3 mm × 3 mm cross-section, made of quartz crystal, and have a thickness of 0.0609 mm. The first optically active crystal 73A and the second optically active crystal 73B are cylindrical with a diameter of 2.8 mm, made of TGG, and have a thickness of 14 mm. Their Verdet constants are 40 rad / T / m.

[0045] like Figure 1 As shown, when the pump light after gain is modulated by the two modulation units and then output to the first dichroic mirror 3, not all of it is output to the outside of the box 1 together with the seed light. A small part of the light is also transmitted to the red light source through the first dichroic mirror. In order to isolate this part of the transmitted light, this solution is also configured with a third dichroic mirror 8. The third dichroic mirror 8 is arranged between the red light source 2 and the first dichroic mirror 3. The third dichroic mirror 8 is located on the light output path of the red light source 2. The central axes of the first dichroic mirror 3 and the third dichroic mirror are arranged at an angle to the optical axis of the output light path of the red light source 2, and the central plane of the third dichroic mirror 8 is arranged parallel to the central plane of the first dichroic mirror 3.

[0046] To better achieve the projection and reflection functions, a fully transparent film is usually provided at the end of the first dichroic mirror 3 close to the red light source 2 and the end of the third dichroic mirror 8 close to the red light source 2; a reflective film is provided at the end of the first dichroic mirror 3 away from the red light source 2 and the end of the third dichroic mirror 8 away from the red light source 2; a fully transparent film is provided at the end of the second dichroic mirror 6 close to the pump source 4, and a reflective film is provided at the end of the second dichroic mirror 6 away from the pump source 4; the third dichroic mirror 8 isolates the amplified pump light that passes through the first dichroic mirror 3 and propagates toward the red light source 2.

[0047] like Figure 2 、 Figure 3 and Figure 4As shown, the housing 1 includes an integrated base plate 11 and a cover plate. The red light source 2, the pump source 4, the first dichroic mirror 3, the second dichroic mirror 6, the third dichroic mirror, and the crystal assembly 7 are all fixedly mounted on the base plate 11, and the gain fiber 5 is disposed on the side surface of the cover plate. The first birefringent crystal 71, the first half-wave plate 72, the first optical rotation crystal 73, and the second birefringent crystal 74 of at least two modulation units 70 are each provided with a mirror base 12 and an end cap 13. The mirror base 12 is fixedly connected to the base plate 11. A bonding surface is provided on the mirror base 12 or the end cap 13. The bonding surface has a placement position for the first birefringent crystal 71, the first half-wave plate 72, the first optical rotation crystal 73, or the second birefringent crystal 74. In order to ensure the positional stability of the components of the modulation unit, the mirror base 12 is arranged linearly and spaced apart. The first birefringent crystal 71, the first optically active crystal 73, and the second birefringent crystal 74 of the two modulation units 70 all adopt a mirror base 12 and an end cover with a wedge-shaped surface. The mirror base 12 and the end cover 13 are both provided with a card slot, which abuts against the surfaces of the first birefringent crystal 71, the first optically active crystal 73, and the second birefringent crystal 74. The mirror base 12 and the end cover 13 together form a trapezoidal structure. The card slots on the mirror base 12 and the end cover 13 can be a rectangular structure for accommodating components; and the first half-wave plates 72 of the two modulation units 70 are provided with a circular end cover 13 on one side of the trapezoidal mirror base 12. A through hole is provided on the mirror base 12, which is coaxial with the end cover, and the end cover is used to accommodate the first half-wave plate 72.

[0048] To prevent optical path deviation caused by strain due to heat or force, a number of through-grooves 100 are provided on the base plate 11 of the red light source 2 or pump source 4. These through-grooves 100 are arranged horizontally through the base plate 11 along the light output direction of the red light source 2 or pump source 4, and have a height-to-width ratio of 1:1. The number of through-grooves 100 on the base plate 11 of the red light source 2 or pump source 4 is an odd number, with the optical axis of the red light source 2 or pump source 4 located at the center plane of the through-grooves 100 in the middle. The diagram shows a single through-grooves 100 provided on the bottom of the red light source 2 or pump source 4, but this is not considered a limit on the number of through-grooves 100 that can be provided. Through-grooves can prevent stress transfer or accumulation, which can lead to low coupling efficiency caused by optical path deviation.

[0049] The integrated packaged laser provided by the present invention has the following advantages:

[0050] 1. Multiple dichroic mirrors are used to couple light of different wavelengths into the output fiber, which greatly reduces the loss caused by the conventional tapered fiber method while also ensuring the beam quality;

[0051] 2. The online isolator adopts a spatial coupling solution, which avoids the collimation of optical fibers and the processing of the output end, reduces the number of optical fiber fusion splicing times, and greatly increases the integration of the laser module. The key crystal of the modulation unit can be fixed on a large base plate, and when fixed, there will be no stress deformation of the profile that causes the coupling to decrease.

[0052] 3. The pump light and red light are coupled to directly output laser light. The overall system is highly integrated, with a large base plate area and strong thermal conductivity. The copper-gold plating process can be eliminated, and the fiber coupling at the output end can also be eliminated. The output is injected into the optical fiber using spatial coupling. At the same time, the second and third dichroic mirrors can also play a certain role in isolating the reverse light and play a certain protective role for the pump source and the red light source.

[0053] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An integrated packaged laser, characterized in that: include: The hollow box (1) has two ends along its length, namely a first end and a second end; A red light source (2) is arranged in the housing (1) near the first end and is used to output seed light in the red light band; A first dichroic mirror (3) is arranged on the output light path of the red light source (2) and is used to allow the seed light to be transmitted in one direction; A pump source (4) is arranged inside the box (1) near the second end and is used to output pump light; A gain optical fiber (5) is embedded in the housing (1), and the gain optical fiber (5) is located on the output optical path of the pump source (4) and is connected to the optical path of the pump source (4). The gain optical fiber (5) amplifies the input pump light and then sends the amplified pump light back into the housing (1) and toward the pump source (4). A second dichroic mirror (6) is disposed inside the box (1) between the pump source (4) and the gain optical fiber (5), and is used to allow the pump light to pass unidirectionally and be emitted toward the gain optical fiber (5), and to reflect the pump light after gain output by the gain optical fiber (5); A crystal assembly (7) is arranged in a housing (1) between a red light source (2) and a pump source (4), wherein an input end of the crystal assembly (7) is connected to a reflection light path of a second dichroic mirror (6), and an output end of the crystal assembly (7) is connected to a reflection light path of a first dichroic mirror (3). The crystal assembly (7) is used to modulate the input pump light after gain, output the modulated light to an end of the first dichroic mirror (3) away from the red light source (2), and output the modulated light to the outside of the housing (1) together with the seed light.

2. The integrated packaged laser according to claim 1, characterized in that: The crystal assembly (7) comprises at least two modulation units (70) arranged in sequence, and the optical paths of the at least two modulation units (70) are coaxially arranged.

3. The integrated packaged laser according to claim 2, characterized in that: The at least two modulation units (70) each comprise a first birefringent crystal (71), a first half-wave plate (72), a first optically active crystal (73) and a second birefringent crystal (74) arranged in sequence, wherein the input end of the first birefringent crystal (71) is optically connected to the end of the second dichroic mirror (6) away from the pump source (4); the input end of the first half-wave plate (72) is optically connected to the output end of the first birefringent crystal (71); the output end of the first half-wave plate (72) is optically connected to the input end of the first optically active crystal (73); the output end of the first optically active crystal (73) is optically connected to the input end of the second birefringent crystal (74); and the output end of the second birefringent crystal (74) is optically connected to the input end of the first birefringent crystal (71) of the adjacent modulation unit (70) or to the end of the first dichroic mirror (3) away from the red light source (2).

4. The integrated packaged laser according to claim 3, characterized in that: The first birefringent crystal (71) and the second birefringent crystal (74) of the at least two modulation units (70) are both made of YV04, and have a cross-sectional shape of a 3mm×3mm square. The axial thickness of the first birefringent crystal (71) is not completely the same as the axial thickness of the second birefringent crystal (74). The first half-wave plate (72) is a rectangular parallelepiped with a cross-sectional size of 3mm×3mm, made of quartz crystal, and has a thickness of 0.0609mm. The first optical rotation crystal (73) is a cylinder with a diameter of 2.8mm, made of TGG, has a thickness of 14mm, and has a Verdet constant of 40rad / T / m.

5. The integrated packaged laser according to claim 4, characterized in that: The gain optical fiber (5) is an ytterbium-doped gain optical fiber; the wavelength of the pump light output by the pump source (4) is 915 nm, 976 nm or 980 nm.

6. The integrated packaged laser according to claim 1, characterized in that: The invention also includes a third dichroic mirror (8), which is arranged between the red light source (2) and the first dichroic mirror (3), and is located on the light output path of the red light source (2). The central axes of the first dichroic mirror (3) and the third dichroic mirror are arranged at an angle to the optical axis of the output light path of the red light source (2), and the central plane of the third dichroic mirror (8) is arranged parallel to the central plane of the first dichroic mirror (3).

7. The integrated packaged laser according to claim 6, characterized in that: The end of the first dichroic mirror (3) close to the red light source (2) and the end of the third dichroic mirror (8) close to the red light source (2) are both provided with fully transparent films; the end of the first dichroic mirror (3) away from the red light source (2) and the end of the third dichroic mirror (8) away from the red light source (2) are both provided with reflective films; the end of the second dichroic mirror (6) close to the pump source (4) is provided with a fully transparent film, and the end of the second dichroic mirror (6) away from the pump source (4) is provided with a reflective film; the third dichroic mirror (8) isolates the pump light after gain that propagates toward the red light source (2) after passing through the first dichroic mirror (3).

8. The integrated packaged laser according to claim 7, characterized in that: The box (1) comprises an integrated bottom plate (11) and a cover plate; a red light source (2), a pump source (4), a first dichroic mirror (3), a second dichroic mirror (6), a third dichroic mirror and a crystal assembly (7) are all fixedly arranged on the bottom plate (11); a gain optical fiber (5) is arranged on a side surface of the cover plate; a first birefringent crystal (71), a first half-wave plate (72), a first optical rotation crystal (73) and a second birefringent crystal (74) of at least two modulation units (70) are all provided with a mirror seat (12) and an end cover (13); the mirror seat (12) is fixedly connected to the bottom plate (11); a fitting surface is provided on the mirror seat (12) or the end cover (13); and a placement position for placing the first birefringent crystal (71), the first half-wave plate (72), the first optical rotation crystal (73) or the second birefringent crystal (74) is provided on the fitting surface.

9. The integrated packaged laser according to claim 8, characterized in that: A plurality of through grooves (100) are provided on a bottom plate (11) of a red light source (2) or a pump source (4). The through grooves (100) are arranged horizontally through the bottom plate (11) along a light emitting direction of the red light source (2) or the pump source (4), and the height-to-width ratio of the through grooves (100) is 1:

1.

10. The integrated packaged laser according to claim 9, characterized in that: The number of through slots (100) on the bottom plate (11) of the red light source (2) or the pump source (4) is an odd number, and the optical axis of the red light source (2) or the pump source (4) is located on the center plane of the through slot (100) at the middle position.

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