Side pumping module based on semiconductor laser

Abstract

The utility model provides a side pumping module based on a semiconductor laser, which belongs to the technical field of side pumping modules, and comprises a metal reflection cavity, a semiconductor laser, a side pumping module and a side pumping module, a plurality of groups of light inlets are uniformly formed in the outer wall of the metal reflection cavity in the axial direction; each group of light inlets comprises at least three light inlets which are uniformly formed in the circumferential direction of the outer wall of the metal reflection cavity; the glass sleeve is embedded in the metal reflection cavity and is coaxial with the cavity body; the two ends of the glass sleeve are connected with water channels; the two ends of the crystal rod are fixedly arranged in the glass sleeve and are coaxial with the glass sleeve; at least three groups of semiconductor modules; and each group of semiconductor modules comprises at least three semiconductor lasers which are electrically connected in series in sequence, are annularly and uniformly erected at the same group of light inlets of the metal reflection cavity, and emit laser to the glass sleeve through the light inlets. The side pumping module is high in conversion efficiency, uniform in pumping light distribution and stable in output energy.

Description

Technical Field

[0001] The utility model relates to the technical field of side pump modules, in particular to a side pump module based on a semiconductor laser. Background Art

[0002] Semiconductor laser side pumping technology has high efficiency and high output energy, and is often used in industrial transportation, scientific research, medical treatment, military industry and other fields. The solid laser developed using this technology is small in size and light in weight, which is conducive to equipment integration. However, since semiconductor laser side pumping technology has high design requirements, semiconductor laser side pumping modules with good product quality on the market meet market demand.

[0003] The existing pump modules on the market have low pumping efficiency. In order to achieve a certain laser output energy, more semiconductor lasers are usually used, resulting in higher costs and increased laser heat. The corresponding laser drive power supply will also increase the cost accordingly. In addition, the pump light distribution of some pump modules is uneven, and the crystal rod is prone to depolarization. Utility Model Content

[0004] In order to solve the above technical problems, the utility model proposes a side pumping module based on a semiconductor laser, which has high conversion efficiency, uniform pump light distribution and stable output energy.

[0005] The utility model provides the following technical solutions:

[0006] A side pumping module based on a semiconductor laser, comprising:

[0007] A metal reflective cavity having a circular cavity inside; a plurality of groups of light inlets are evenly arranged on the outer wall of the metal reflective cavity in the axial direction; each group of light inlets includes at least three light inlets, which are evenly arranged along the circumferential direction of the outer wall of the metal reflective cavity;

[0008] A glass sleeve is embedded in the metal reflective cavity and is coaxial with the cavity; both ends of the glass sleeve are connected with water channels;

[0009] A crystal rod, both ends of which are fixedly mounted in the glass sleeve and coaxial with the glass sleeve;

[0010] At least three groups of semiconductor modules; each group of semiconductor modules includes at least three semiconductor lasers, which are electrically connected in series in sequence and evenly arranged in a ring at the same group of light inlets of the metal reflection cavity, and emit lasers to the glass sleeve through the light inlets.

[0011] Preferably, the cross-section of the exterior of the metal reflective cavity is an equilateral triangle structure; each group of the light inlets includes three light inlets, which are respectively located at the centers of three sides of the metal reflective cavity.

[0012] Preferably, the semiconductor laser comprises a semiconductor laser chip; the semiconductor laser chip is soldered to two copper-tungsten heat sinks via gold-tin solder.

[0013] Preferably, it further comprises a plurality of water-passing blocks; the copper-tungsten heat sinks of the semiconductor laser coaxially arranged along the axis direction of the crystal rod are all soldered to the water-passing blocks by means of gold-tin solder.

[0014] Preferably, a power-on electrode is packaged on the copper-tungsten heat sink, and the power-on electrode is electrically connected to the semiconductor laser.

[0015] Preferably, the cavity body of the metal reflective cavity is a copper-gold-plated reflective cavity.

[0016] Preferably, the cavity of the metal reflective cavity is a mirror inner wall.

[0017] Preferably, the glass sleeve is a quartz sleeve.

[0018] Beneficial effects of the utility model:

[0019] The utility model proposes a side pumping module based on a semiconductor laser. The metal reflection cavity of the side pumping module is uniformly provided with a plurality of light inlets along the circumferential direction. When the semiconductor laser is driven by a driving power supply to emit laser, light enters from the light inlet and irradiates the crystal rod through a glass sleeve. Part of the laser light will be continuously reflected in the metal cavity, and a uniformly distributed light field will be formed in the entire metal cavity, and uniformly irradiated on the crystal rod. The gain medium in the crystal rod will absorb light of a specific wavelength, and produce an energy level transition from a low energy state to a high energy state. Subsequently, due to the instability of the high energy state, an energy level transition will occur again, from a high energy state to a low energy state, and energy will be released outward in the form of light and heat. The generated photons will form oscillations along the direction of the laser resonant cavity. When the gain in the resonant cavity is greater than the loss, laser light will be output. The side pumping module has high conversion efficiency, uniform distribution of pump light, and stable output energy. In addition, the side pumping module has good reliability, long service life, and a small module size and light weight. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the radial cross-sectional structure of a side pumping module based on a semiconductor laser according to Embodiment 1 of the present utility model;

[0021] Figure 2 It is a schematic diagram of the axial cross-sectional structure of a side pumping module based on a semiconductor laser according to Embodiment 1 of the present utility model;

[0022] Figure 3 This is a schematic diagram of semiconductor laser packaging in Embodiment 1 of the present utility model;

[0023] Figure 4This is a schematic diagram of the cooperation between the semiconductor laser and the water-passing block in Embodiment 1 of the utility model;

[0024] Figure 5 It is a schematic diagram of the radial cross-sectional structure of a semiconductor laser-based side pumping module according to Embodiment 2 of the present utility model.

[0025] In the figure, 1. semiconductor laser; 2. metal reflection cavity; 3. glass sleeve; 4. crystal rod; 5. semiconductor laser chip; 6. copper tungsten heat sink; 7. water block; 8. gold-tin solder. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0027] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0028] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features; in the description of the present utility model, unless otherwise specified, "plurality" means two or more.

[0029] Example 1

[0030] The existing pumping module has low pumping efficiency. In order to achieve a certain laser output energy, more semiconductor lasers are usually used, resulting in high cost, increased laser heat, and corresponding laser driving power supply. The cost will also increase accordingly. In addition, the pumping light distribution of some pumping modules is uneven, and the crystal rod is prone to depolarization. To this end, this embodiment proposes a side pumping module based on a semiconductor laser, such as Figure 1 and Figure 2As shown, they are respectively a schematic diagram of the radial cross-section structure and a schematic diagram of the axial cross-section structure of the side pump module, including a metal reflection cavity 2, a glass sleeve 3, a crystal rod 4 and at least three groups of semiconductor modules. The interior of the metal reflection cavity 2 has a circular cavity; the outer wall of the metal reflection cavity 2 is axially and evenly provided with multiple groups of light inlets; each group of light inlets includes at least three light inlets, which are evenly provided along the circumferential direction of the outer wall of the metal reflection cavity 2; the glass sleeve 3 is embedded in the metal reflection cavity 2 and is coaxial with the cavity; water channels are connected at both ends of the glass sleeve 3; both ends of the crystal rod 4 are fixedly installed in the glass sleeve 3 and are coaxial with the glass sleeve 3; each group of semiconductor modules includes at least three semiconductor lasers 1, which are electrically connected in series in sequence, and are evenly arranged in a ring at the same group of light inlets of the metal reflection cavity 2, and emit laser light to the glass sleeve 3 through the light inlets. In this embodiment, Figure 1 and Figure 2 As shown, each group of light inlets has three light inlets, the cavity of the metal reflection cavity 2 is a copper-plated gold reflection cavity, and the size of the reflection cavity needs to be determined by optical software simulation to ensure that the semiconductor pump light can be evenly distributed in the cavity and the number of reflections is increased to the maximum. The reflection cavity has a mirror inner wall. The glass sleeve 3 is a quartz sleeve. Both ends of the glass sleeve 3 and the crystal rod 4 are sealed.

[0031] When working, the semiconductor laser 1 is driven by a driving power supply to emit 808nm laser light, which is irradiated onto the crystal rod 4 through the glass sleeve 3. Part of the 808nm laser light will be continuously reflected in the metal cavity, and form a uniformly distributed light field in the entire metal cavity, which is uniformly irradiated onto the crystal rod 4. The gain medium in the crystal rod 4 will absorb light of a specific wavelength and produce an energy level transition from a low energy state to a high energy state. Subsequently, due to the instability of the high energy state, an energy level transition will occur again, from a high energy state to a low energy state, and energy will be released outward in the form of light and heat. The generated photons will oscillate along the direction of the laser resonant cavity. When the gain in the resonant cavity is greater than the loss, laser light will be output.

[0032] Furthermore, this embodiment provides a new semiconductor laser packaging technology. Figure 3 and Figure 4 As shown, Figure 3 This is a schematic diagram of semiconductor laser packaging. Figure 4 The figure is a schematic diagram of the cooperation between the semiconductor laser and the water block. The semiconductor laser 1 includes a semiconductor laser chip 5; the semiconductor laser chip 5 is soldered to two copper tungsten heat sinks 6 through a gold-tin solder 8. The copper tungsten heat sink 6 is encapsulated with a powered electrode, which is electrically connected to the semiconductor laser 1. The copper tungsten heat sinks 6 of the semiconductor laser 1 arranged along the axis of the crystal rod 4 and coaxially are all soldered to the water block 7 through the gold-tin solder 8 to provide heat dissipation for the semiconductor laser module to ensure the reliability and stability of the product.

[0033] Example 2

[0034] This embodiment provides a special metal reflective cavity 2 structure, such as Figure 5 As shown, the reflective cavity is made of copper-plated gold, and the external shape is an equilateral triangle. This embodiment is arranged in three groups of modules, and a light inlet is opened at the center of each side of the equilateral triangle. The interior of the reflective cavity is a circular structure, and the inner wall of the cavity is treated with a gold-plated mirror. When the 808nm laser is irradiated into the reflective cavity, the laser is continuously reflected inside the reflective cavity and finally reaches a uniform light field distribution state in the cavity, providing uniform, continuous and stable pump light for the crystal rod 4.

[0035] In summary, the side pump module has high conversion efficiency, uniform pump light distribution, and stable output energy. In addition, the side pump module has good reliability, long service life, and small size and light weight.

[0036] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A side pumping module based on a semiconductor laser, characterized in that: include: A metal reflective cavity (2) having a circular cavity inside; a plurality of groups of light inlets are evenly arranged axially on the outer wall of the metal reflective cavity (2); each group of light inlets comprises at least three light inlets, which are evenly arranged circumferentially along the outer wall of the metal reflective cavity (2); A glass sleeve (3) is embedded in the metal reflection cavity (2) and is coaxial with the cavity; both ends of the glass sleeve (3) are connected to water channels; A crystal rod (4), both ends of which are fixedly mounted in the glass sleeve (3) and are coaxial with the glass sleeve (3); At least three groups of semiconductor modules; each group of semiconductor modules comprises at least three semiconductor lasers (1), which are electrically connected in series in sequence and are evenly arranged in a ring shape at the same group of light inlets of the metal reflection cavity (2), and emit laser light to the glass sleeve (3) through the light inlets.

2. The semiconductor laser-based side pumping module according to claim 1, characterized in that: The cross-section of the outside of the metal reflection cavity (2) is an equilateral triangle structure; each group of light inlets comprises three light inlets, which are respectively located at the centers of three sides of the metal reflection cavity (2).

3. The semiconductor laser-based side pumping module according to claim 1, characterized in that: The semiconductor laser (1) comprises a semiconductor laser chip (5); the semiconductor laser chip (5) is welded to two copper-tungsten heat sinks (6) via gold-tin solder (8).

4. The semiconductor laser-based side pumping module according to claim 3, characterized in that: It also comprises a plurality of water-passing blocks (7); the copper-tungsten heat sinks (6) of the semiconductor laser (1) which are coaxially arranged along the axis direction of the crystal rod (4) are all welded to the water-passing blocks (7) by means of gold-tin solder (8).

5. The semiconductor laser-based side pumping module according to claim 3, characterized in that: A power-on electrode is packaged on the copper-tungsten heat sink (6), and the power-on electrode is electrically connected to the semiconductor laser (1).

6. The semiconductor laser-based side pumping module according to claim 1, characterized in that: The cavity body of the metal reflection cavity (2) is a copper-gold-plated reflection cavity.

7. The semiconductor laser-based side pumping module according to claim 1, characterized in that: The cavity body of the metal reflection cavity (2) is a mirror inner wall.

8. The semiconductor laser-based side pumping module according to claim 1, characterized in that: The glass sleeve (3) is a quartz sleeve.

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