CN117748278A - High-power cascading type LD side pumping laser module and assembly method - Google Patents

Abstract

The invention discloses a high-power cascade type LD side pumping laser module and an assembly method, and belongs to the technical field of solid laser. The laser module structure mainly comprises four parts, namely a side pumping module base, an LD module, a cylindrical fixing groove and a cooling module, wherein the side pumping module base is used for fixing the LD module and the laser crystal; the LD module is used for providing pumping energy for the gain medium; the cylindrical fixing groove is used for fixing the laser crystal of the module; the cooling module is used for radiating heat of the side pumping module base; the method is different from the common traditional pumping laser module in that the crystal rod assembly adopts a pressing mode, the circular grooves are aligned accurately by using a clamping groove positioning design, and the assembly of one or more cascaded micro-size crystal rods with the diameter of 100-1000 mu m is realized. The invention provides pumping energy for the laser crystal in a horizontal pumping mode and dissipates heat of the LD module and the crystal rod in a heat conduction mode.

Description

High-power cascading type LD side pumping laser module and assembly method

Technical Field

The invention relates to the technical field of lasers, in particular to a high-power cascade type LD side pumping laser module and an assembly method.

Background

The all-solid-state laser is a laser generating device which takes a semiconductor laser as a pumping source and takes a solid laser material as a gain medium, has the advantages of compact structure, high stability, high power, high photoelectric conversion efficiency, high beam quality, long service life and the like, and has important positions in the fields of military, medicine, material processing and the like. In the field of high-power solid-state lasers, a surrounding type side-face multi-directional horizontal pumping or end-face pumping mode is generally adopted, and an LD pumping source and a laser crystal need to be cooled respectively. However, the laser device has a complex structure, limited output power and difficult miniaturization, and cannot be applied to a compact high-power all-solid-state laser.

The invention designs a high-power cascade type LD side pumping laser module and an assembly method, the device has simple and compact structure, and can realize the accurate assembly of the micro-size laser crystal with the diameter of 100-1000 mu m. The pumping source adopts a pulse mode, so that ultra-high gain output can be obtained, and the amplification of the micro-size laser beam is realized. And the number of the laser crystals and the LD modules can be configured according to actual requirements, and the method has the advantage of strong expansibility.

CN113937608A, an integrated semiconductor laser side pumping module, belongs to the technical field of solid laser. The module is composed of a base, a semiconductor laser, a gain medium, fixing glue, a wire, a ceramic insulating heat conducting pad, a metal heat conducting sheet, a locking screw, a T-shaped insulating cap, a positive electrode, a negative electrode and other components. The semiconductor laser is positioned at the upper part of the base, and pump light emitted by the semiconductor laser is absorbed by the gain medium through the slit; the semiconductor lasers are connected through wires, the two semiconductor lasers are used as a group of pumping units, and the lateral staggered pumping is performed by selecting a plurality of groups of pumping units; a ceramic insulation heat conduction pad is arranged between the base and the semiconductor laser for insulation treatment, and metal heat conduction sheets are respectively attached to the surfaces of two sides of the ceramic insulation heat conduction pad; compared with the traditional three-way annular side pump module, the three-way annular side pump module can accommodate more semiconductor lasers, has a more compact structure, and outputs laser with higher output laser power and linear polarization.

1. This patent primarily proposes the assembly of side pump modules and semiconductor lasers.

The invention mainly realizes the accurate assembly of the micro-size laser crystal.

2. The crystal rod assembly method is different: the crystal rod assembly mode of the patent is to insert the crystal rod into the circular groove from the side surface of the pumping module and fix the crystal rod by using PDMS glue, and the crystal rod surface abrasion and the crystal rod fracture can be caused in the transverse insertion process or under the high-power pumping condition, and the assembly mode is not suitable for laser crystals with smaller sizes.

The invention designs an assembling method of a laser crystal, adopts a pressing mode, designs a novel positioning clamping groove on the pressing surface, automatically aligns the edges of a cylindrical groove after the clamping groove is aligned, and attaches a layer of indium foil on the pressing surface to enhance the heat transfer capacity. The diameter size of the laser crystal of the side pumping module can be 100-1000 mu m, and the assembly method can effectively avoid the damage of the crystal rod in the assembly process.

3. The side pumping laser module of this patent adopts the heat dissipation mode of heat conduction, arranges the cooling module in high-power side pumping module below, and at the attached one deck indium foil of contact surface, the inside redundant heat that adopts the hydrologic cycle mode to produce of cooling module eliminates.

4. The method of assembling the side pump module of this patent is only applicable to the assembly of one crystal rod.

The crystal rod of the side pump laser module can be one crystal rod or a plurality of crystal rods which are cascaded, and the same crystal rod assembly groove is utilized to realize automatic alignment.

5. The pump source of this patent works in a continuous pumping mode.

The pumping working mode of the high-power side pumping module can be a continuous or pulse mode, the ultra-high gain output is obtained, and the amplification of the micro-size laser beam is realized.

Disclosure of Invention

The present invention is directed to solving the above problems of the prior art. A high power cascade LD side pumped laser module and an assembly method are provided. The technical scheme of the invention is as follows:

a high power cascade LD side pumped laser module comprising: the Laser Diode cooling device comprises a side pumping module base (1), an LD (Laser Diode) module (2), a cylindrical fixing groove (3) and a cooling module (4), wherein the cylindrical fixing groove (3) is arranged above the side pumping module base (1), the cooling module (4) is arranged below the side pumping module base (1), and a layer of indium foil is attached to the contact surface of the cooling module (4) and the side pumping module base (1) so as to enhance heat conduction capacity, and the side pumping module base (1) is used for fixing the LD module (2) and a Laser crystal; the LD module (2) is used for providing pumping energy for the laser crystal; the cylindrical fixing groove (3) is used for fixing a gain medium of the high-power laser module; the cooling module (4) is used for eliminating redundant heat generated by the LD module (2) and the laser crystal on the side pumping module base (1); the side pumping module base (1) is provided with a plurality of hole sites for fixing the LD module (2); the gain medium is fixed in the cylindrical groove by the cylindrical fixing groove (3), and the gain medium excites fluorescence through energy provided by the pumping source; the cooling module (4) dissipates heat of the side pump laser module in a heat conduction mode.

Further, the side pumping module base (1) fixes the LD module (2) and the cylindrical fixing groove (3) on the laser module.

Furthermore, the LD modules (2) are transversely distributed at one side of the slit of the laser crystal to excite the laser crystal, and one or more LD modules (2) are alternately distributed at two sides of the laser crystal; the laser crystals placed in the cylindrical fixing groove (3) are in one or more cascading modes, and the positioning clamping groove designed by the cylindrical fixing groove (3) fixes a plurality of crystal bars at the same straight line position, so that cascading of a plurality of laser crystals is realized.

Furthermore, the laser module adopts a side pumping mode; the gain medium adopts Nd-YAG crystal, nd-YVO according to the requirement ₄ Various laser crystals including crystal, nd: KGW crystal and Nd: YLF crystal; the pump source operates in a continuous or pulsed mode.

Furthermore, the cylindrical fixing groove (3) adopts a pressing type design, three positioning clamping grooves are designed on the pressing surface, the laser crystal surface at the slit position is wrapped by indium foil during assembly and is placed into the circular groove, the edge of the cylindrical fixing groove (3) is accurately aligned after the limiting clamping grooves on the upper surface and the lower surface are aligned, and a layer of indium foil is attached to the pressing surface and fixed by using a hexagon screw.

Further, the laser crystal has a diameter size of 100 μm to 1000 μm.

Further, an indium foil is attached above the cooling module (4) for enhancing the heat conduction capacity of the contact surface. The laser module is arranged below the LD side pumping laser module, and redundant heat in the laser module is eliminated by continuous circulation of cooling water in the cooling module (4) in a heat conduction mode.

A method of assembling a laser module according to any one of the preceding claims, comprising the steps of:

s1: drawing a fixed hole site and a cylindrical fixed groove (3) of an LD module (2) in a side pumping module base (1), and adopting a pressing design, and designing the fixed hole site and three positioning clamping grooves limiting the transverse and longitudinal directions at the pressing surface to enable the edges of the cylindrical groove to be automatically aligned;

s2: the LD modules (2) are fixed at the hole sites of the side pumping module base by using screws, and are distributed at one side of the slits of the cylindrical fixing grooves (3) in a transverse cascade cross arrangement mode; placing the laser crystal with the surface coated with the indium foil into a cylindrical fixing groove (3), attaching the indium foil on the pressed surface during assembly, aligning the positioning clamping grooves, and fixing the positioning clamping grooves by using a hexagon screw so that the upper contact surface and the lower contact surface are tightly attached;

s3: the pumping light provided by the LD module (3) enters the circular groove through a slit at one side of the cylindrical fixed groove (3), and internally and repeatedly reflects and passes through the gain medium to emit fluorescence;

s4: the cooling module (4) is arranged below the side pumping module base (1), indium foil is attached to the contact surface, and redundant heat generated by the LD module (2) and the laser crystal is eliminated by utilizing a heat conduction mode;

s5: the working mode of the pumping source adopts a continuous pumping or pulse pumping mode, and the ultra-high gain output is obtained through a designed high-power cascade side pumping laser module, so that the amplification of the micro-size laser beam is realized. The invention has the advantages and beneficial effects as follows:

the invention relates to a high-power cascade type LD side pumping laser module and an assembly method, wherein a side pumping module base is designed, LD modules are transversely and crosswise distributed in a cascade mode, pumping energy is provided for a gain medium by adopting side pumping, and the LD modules can work continuously or in a pulse mode. The designed laser module can obtain high-power laser output of the module, and the amplification of the micro-size laser beam is realized. Secondly, a novel cylindrical fixing groove is designed in the module base, the laser crystal is fixed in a pressing mode, the edge positions of the cylindrical groove are precisely aligned by using three positioning clamping grooves, and one or more micro-size laser crystals with the diameter ranging from 100 mu m to 1000 mu m can be assembled in a cascading mode. The module is designed into an independent cooling module, and redundant heat generated by the module is eliminated by adopting a heat conduction mode. The device has compact structure and simple assembly method.

The invention relates to a high-power cascading LD side pumping module and an assembling method, wherein a cylindrical fixing groove is designed on a side module base by adopting a pressing structure, and limit clamping grooves of three chamfer concave-convex grooves are designed at a pressing surface. The device has compact structure, the cooling module is arranged below the module to realize heat dissipation of the module in a heat conduction mode, the pumping working mode of the module can be a continuous or pulse mode, and the device can be used for obtaining high-power laser output and realizing amplification of micro-size laser beams.

Drawings

Fig. 1 is an exploded view of a side pumped laser module in accordance with a preferred embodiment of the present invention. Marked in the figure as: 1. hexagonal screw 2, screw washer 3, press upper surface 4, indium foil 5, positioning clamping groove

Fig. 2 is a positioning slot of a cylindrical fixed slot design for fixing the gain medium of a laser module. And (3) attaching a layer of indium foil to the press fit surface to enhance the heat conduction capacity, aligning the positioning clamping grooves to automatically align the edges of the cylindrical grooves for fixing the laser crystal, and finally fixing the upper part and the lower part by using a hexagon screw.

Fig. 3 is a schematic diagram of the overall structure of a high power cascade LD side pumped laser module. Marked in the figure as: 1. side pumping module base 2.LD module 3. Cylindrical fixed slot 4. Cooling Module

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and specifically described below with reference to the drawings in the embodiments of the present invention. The described embodiments are only a few embodiments of the present invention.

The technical scheme for solving the technical problems is as follows:

the device structure of the high-power cascade type LD side pumped laser module is shown in figure 1, comprising: the laser crystal device comprises a side pumping module base 1, an LD module 2, a cylindrical fixing groove 3 and a cooling module 4, wherein the cylindrical fixing groove 3 adopts a pressing structure, and a positioning clamping groove is designed to fix the laser crystal. The specific implementation method comprises the following steps: s1: the fixing hole position of the LD module 2 and the cylindrical fixing groove 3 are drawn in the side pumping module base 1, and the fixing hole position and three positioning clamping grooves limiting the transverse and longitudinal directions are designed at the pressing surface by adopting a pressing design so that the edges of the cylindrical groove are automatically aligned. S2: on the basis of S1, LD module 2 is fixed on the hole site of the side pumping module base by using screws, and is distributed on one side of the slit of cylindrical fixed slot 3 in a transverse cascade cross arrangement mode. And (3) placing the laser crystal with the surface coated with the indium foil into a cylindrical fixing groove 3, attaching the indium foil on the pressing surface during assembly, aligning the positioning clamping grooves, and fixing the positioning clamping grooves by using a hexagon screw so that the upper contact surface and the lower contact surface are tightly attached. S3: the pumping light provided by the LD module 3 enters the circular groove through the slit at one side of the cylindrical fixed groove 3, and internally and repeatedly reflects and passes through the gain medium to emit fluorescence. S4: the cooling module 4 is arranged below the side pumping module base 1, indium foil is attached to the contact surface, the surface heat transfer capacity is enhanced, and redundant heat generated by the LD module 2 and the laser crystal is eliminated by utilizing a heat conduction mode. S5: the working mode of the pumping source can adopt a continuous pumping or pulse pumping mode, and ultra-high gain output is obtained through a designed high-power cascade side pumping laser module, so that the amplification of the micro-size laser beam is realized.

The side pumping module base 1 is used for fixing an LD module and a laser crystal; a plurality of laterally distributed LD-modules 2 for providing pumping energy for the laser crystal; the cylindrical fixing groove 3 is used for fixing a gain medium of the high-power laser module; the cooling module 4 is used to remove redundant heat generated by the LD module 2 and the laser crystal on the side pumping module base 1.

Preferably, the side pumping module base 1 fixes the LD module 2 and the cylindrical fixing groove 3 on the laser module, and the structure is compact.

Preferably, the laser device transversely distributes the LD modules 2 at one side of the slit of the laser crystal to excite the LD modules, and the arrangement mode can be that one or more LD modules are alternately distributed at two sides of the laser crystal; the laser crystals placed in the cylindrical fixing groove 3 can be one or a plurality of cascaded, and the positioning clamping groove designed by the cylindrical fixing groove 3 can fix a plurality of crystal bars at the same straight line position, so that cascade connection of a plurality of laser crystals is realized.

Preferably, the cylindrical fixing groove 3 of the module adopts a pressing design, three positioning clamping grooves are designed on the pressing surface, the laser crystal surface at the slit position is wrapped by indium foil during assembly and is placed into the circular groove, the edge of the cylindrical fixing groove 3 is accurately aligned after the limiting clamping grooves on the upper surface and the lower surface are aligned, and a layer of indium foil is attached to the pressing surface and fixed by using a hexagon screw. The assembly is simple and convenient, and the damage of the laser crystal in the assembly process can be effectively avoided.

Preferably, the diameter size of the laser crystal of the module can reach 100-1000 μm, and can be any diameter size according to the needs of different situations.

Preferably, the laser module adopts a side pumping mode; the gain medium can adopt Nd-YAG crystal, nd-YVO according to the requirement ₄ Various laser crystals including crystal, nd: KGW crystal and Nd: YLF crystal; the pump source may be operated in a continuous or pulsed manner.

Preferably, an indium foil is attached above the cooling module 4 to enhance the heat conduction capability of the contact surface. The laser module is arranged below the LD side pumping laser module, and redundant heat in the laser module is eliminated by continuous circulation of cooling water in the cooling module 4 in a heat conduction mode.

The following are specific examples: preferred embodiment 1: as a preferred embodiment, the entire side pumping module is composed of high heat conductive material red copper, and is plated with gold film (including slit surface and cylindrical fixing groove 1 surface) on the surface. And tin foil attached ceramic plates are arranged on the front surface and the back surface between the LD module 2 and the side pumping module base 1. An indium foil layer is attached to the pressing surface of the cylindrical fixing groove 3, so that the heat conduction capacity is enhanced. The high-power laser module adopts a cascade horizontal pumping structure, the gain medium is one or more cascade Nd: YAG crystals, the working mode can be continuous or pulse pumping, the cooling module is internally cooled by circulating water, and the laser module is subjected to heat dissipation treatment in a heat conduction mode.

The apparatus embodiments described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separable, and the elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In summary, the invention researches a high-power cascade type LD side pumping laser module and an assembling method thereof, and firstly designs a side pumping module base, including an LD module fixing hole site and a cylindrical fixing groove. The cylindrical fixing groove adopts a pressing type design, and a positioning clamping groove is designed at the pressing surface to realize the accurate alignment of the edges of the cylindrical groove. The laser crystal in the laser module can be single or multi-cascade with the diameter of 100-1000 mu m, the LD module is distributed on one side of the slit of the crystal rod, and the pumping energy is provided for the laser crystal in a side pumping mode. The laser module transfers the redundant heat to the cooling module in a thermally conductive manner, and the operation mode of the LD module may be continuous or pulsed. The invention has simple and compact structure, can obtain ultra-high gain output and realize the amplification of micro-size laser beams.

The system, apparatus, module or unit set forth in the above embodiments may be implemented in particular by a computer chip or entity, or by a product having a certain function. One typical implementation is a computer. In particular, the computer may be, for example, a personal computer, a laptop computer, a cellular telephone, a camera phone, a smart phone, a personal digital assistant, a media player, a navigation device, an email device, a game console, a tablet computer, a wearable device, or a combination of any of these devices.

It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article or apparatus that comprises the element.

The above examples should be understood as illustrative only and not limiting the scope of the invention. Various changes and modifications to the present invention may be made by one skilled in the art after reading the teachings herein, and such equivalent changes and modifications are intended to fall within the scope of the invention as defined in the appended claims.

Claims (8)

1. A high power cascade LD side pumped laser module comprising: the laser diode device comprises a side pumping module base (1), an LD semiconductor laser diode module (2), a cylindrical fixing groove (3) and a cooling module (4), wherein the cylindrical fixing groove (3) is arranged above the side pumping module base (1), the cooling module (4) is arranged below the side pumping module base (1), and a layer of indium foil is attached to the contact surface of the cooling module (4) and the side pumping module base (1) so as to enhance heat conduction capability, and the side pumping module base (1) is used for fixing the LD module (2) and a laser crystal; the LD module (2) is used for providing pumping energy for the laser crystal; the cylindrical fixing groove (3) is used for fixing a gain medium of the high-power laser module; the cooling module (4) is used for eliminating redundant heat generated by the LD module (2) and the laser crystal on the side pumping module base (1); the side pumping module base (1) is provided with a plurality of hole sites for fixing the LD module (2); the gain medium is fixed in the cylindrical groove by the cylindrical fixing groove (3), and the gain medium excites fluorescence through energy provided by the pumping source; the cooling module (4) dissipates heat of the side pump laser module in a heat conduction mode.

2. A high power cascade LD side pumped laser module according to claim 1, characterized in that said side pumped module base (1) secures the LD module (2) and the cylindrical fixation groove (3) to the laser module.

3. The high-power cascade type LD side pumping laser module according to claim 1, wherein said LD modules (2) are laterally distributed at one side of a slit of a laser crystal to excite energy, and one or more LD modules (2) are alternately distributed at both sides of the laser crystal; the laser crystals placed in the cylindrical fixing groove (3) are in one or more cascading modes, and the positioning clamping groove designed by the cylindrical fixing groove (3) fixes a plurality of crystal bars at the same straight line position, so that cascading of a plurality of laser crystals is realized.

4. The high-power cascade LD side-pumped laser module of claim 1, wherein said laser module employs side-pumped pumping; the gain medium adopts Nd-YAG crystal, nd-YVO according to the requirement ₄ Various laser crystals including crystal, nd: KGW crystal and Nd: YLF crystal; the pump source operates in a continuous or pulsed mode.

5. The high-power cascade type LD side pumping laser module of claim 1, wherein the cylindrical fixing groove (3) is designed by pressing, three positioning clamping grooves are designed on the pressing surface, the laser crystal surface except the slit position is wrapped by indium foil and placed in the circular groove during assembly, the edge of the cylindrical fixing groove (3) is aligned precisely after the limiting clamping grooves on the upper surface and the lower surface are aligned, and a layer of indium foil is attached on the pressing surface and fixed by using a hexagonal screw.

6. The high power cascade LD side pumped laser module of claim 1, wherein said laser crystal has a diameter dimension of 100 μm-1000 μm.

7. A high power cascade LD side pumped laser module according to claim 1, characterized in that the cooling module (4) is coated with indium foil above for enhancing the heat conductivity of its contact surface. The laser module is arranged below the LD side pumping laser module, and redundant heat in the laser module is eliminated by continuous circulation of cooling water in the cooling module (4) in a heat conduction mode.

8. A method of assembling a laser module according to any one of claims 1-7, comprising the steps of:

s1: drawing a fixed hole site and a cylindrical fixed groove (3) of an LD module (2) in a side pumping module base (1), and adopting a pressing design, and designing the fixed hole site and three positioning clamping grooves limiting the transverse and longitudinal directions at the pressing surface to enable the edges of the cylindrical groove to be automatically aligned;

s2: the LD modules (2) are fixed at the hole sites of the side pumping module base by using screws, and are distributed at one side of the slits of the cylindrical fixing grooves (3) in a transverse cascade cross arrangement mode; placing the laser crystal with the surface coated with the indium foil into a cylindrical fixing groove (3), attaching the indium foil on the pressed surface during assembly, aligning the positioning clamping grooves, and fixing the positioning clamping grooves by using a hexagon screw so that the upper contact surface and the lower contact surface are tightly attached;

s3: the pumping light provided by the LD module (3) enters the circular groove through a slit at one side of the cylindrical fixed groove (3), and internally and repeatedly reflects and passes through the gain medium to emit fluorescence;

s4: the cooling module (4) is arranged below the side pumping module base (1), indium foil is attached to the contact surface, and redundant heat generated by the LD module (2) and the laser crystal is eliminated by utilizing a heat conduction mode;

s5: the working mode of the pumping source adopts a continuous pumping or pulse pumping mode, and the ultra-high gain output is obtained through a designed high-power cascade side pumping laser module, so that the amplification of the micro-size laser beam is realized.