CN217984057U - High-power laser pumping source and fiber laser - Google Patents

Abstract

The utility model relates to the technical field of laser processing, and discloses a high-power laser pumping source and a fiber laser, which comprises a plurality of light source modules, a first collimating lens and a first reflector which have the same quantity as the light source modules, a polarization beam combiner, a focusing lens and a mode stripping fiber; the first collimating lens, the first reflector, the polarization beam combiner and the focusing lens are sequentially arranged in the light emergent direction of the light source module; after being collimated by the first collimating lens, the pump light emitted by the light source module is reflected to the polarization beam combiner for superposition coupling output through the first reflector, the pump light subjected to superposition coupling is focused by the focusing lens and then input into the mode stripping optical fiber for stripping, and the pump light subjected to mode stripping is output from the transmission optical fiber. The pump light is directly coupled and input into the mode stripping optical fiber through the focusing lens, compared with the mode stripping optical fiber coupling, the mode stripping optical fiber coupling method omits a welding procedure of the transmission optical fiber and the mode stripping optical fiber and the transmission optical fiber used in the welding procedure, and simplifies the connection process of the mode stripping optical fiber and a pump source.

Description

High power laser pump source and fiber laser

【Technical field】

The embodiment of the utility model relates to the technical field of laser processing, in particular to a high-power laser pump source and a fiber laser.

【Background technique】

In recent years, with the continuous development and promotion of laser technology, more and more traditional manufacturing industries use laser technology to improve processing quality and greatly improve processing efficiency. In the past two years, fiber lasers have continuously expanded their application in high-end manufacturing industries, such as energy-saving automobiles, aerospace, ships, high-speed rail, and high-power cleaning and cutting industries, by improving laser power and beam quality. Greatly solve the technical problems of traditional processing, while improving processing production efficiency. As the core device of the fiber laser, the pump source is constantly exploring and breaking through in the design of higher power and high brightness. The output power of a single pump source of some enterprises reaches the KW (kilowatt) level.

In the existing fiber laser, the mode-stripping fiber and the laser pumping source are set separately and independently, and the transmission fiber between the mode-stripping fiber and the pumping source is fused and welded, which increases the connection process and welding points between the mode-stripping fiber and the pumping source, and The transmission of the point-to-pump light is lossy, which is not conducive to the transmission of the pump light. And it is necessary to set a separate area on the fiber laser to install the stripped fiber, which increases the volume of the fiber laser.

【Content of utility model】

The embodiment of the utility model aims to provide a high-power laser pump source and a fiber laser, which directly integrates the mode-stripped optical fiber into the pump source, reducing the research and development and manufacturing costs of the laser pump source.

The utility model embodiment solves its technical problem and adopts the following technical solutions:

A high-power laser pumping source, including a plurality of light source modules, a first collimating lens and a first reflector with the same number as the light source modules, a polarization beam combiner, a focusing lens, and a mode-stripped optical fiber; wherein, the The first collimating lens, the first reflecting mirror, the polarization beam combiner and the focusing lens are sequentially arranged in the light emitting direction of the light source module; the pump light emitted by the light source module is collimated by the first collimating lens, The reflection mirror is reflected to the polarization beam combiner for superimposed coupling output, and the focusing lens focuses the superimposed coupled pump light and then enters the mode stripped fiber for mode stripping, and the mode stripped pump light is output from the transmission fiber.

As a preferred solution, a plurality of the light source modules are distributed in an array, and the light source modules in each column are arranged in a staggered order from high to low, and each light source module is correspondingly provided with a first collimating mirror and a first reflector; the pumping The source also includes a second reflector with the same number as the number of columns of the light source module and facing the first reflector; the polarization beam combiner includes a first light incident surface and a second light incident surface, at least one The pump light emitted by the row of light source modules is reflected by the first reflector to the second reflector, and is reflected by the second reflector to the first light-incident surface; among the remaining light source modules, the pump light emitted by at least one row of light source modules The pumping light is reflected by the first reflector to the second reflector, and then reflected by the second reflector to the second light incident surface.

As a preferred solution, the pumping source is provided with 8 stepped heat sinks, each of which is strip-shaped and arranged side by side with a first heat sink and a second heat sink, and the light source modules are arranged at intervals between the first and second heat sinks. An array distribution is formed on a heat sink, and the first collimating mirror and the first reflector are correspondingly arranged on the second heat sink; the polarization beam combiner is provided with 2, adjacent to every 4 stepped heat sinks Correspondingly, a polarization beam combiner is provided, wherein the pump light emitted by the light source modules on the two adjacent first heat sinks is reflected into the first light incident surface, and the light source modules on the remaining two first heat sinks The emitted pump light is reflected into the second light incident surface.

As a preferred solution, the polarization beam combiner also includes a light exit surface, and the pump source also includes a third mirror, and the third reflection mirror is arranged facing the light exit surface of one of the polarization beam combiners; The pump light emitted from the light-emitting surface of the polarization beam combiner directly enters the focusing lens, and the pump light emitted from the light-emitting surface of another polarization beam combiner is reflected by the third mirror and then enters the focusing lens. .

As a preferred solution, at the rear of the focusing lens, facing the focusing lens, a fourth reflecting mirror is also provided, and the pumping light emitted from the light-emitting surface of the polarization beam combiner and the pumping light reflected from the third reflecting mirror pass through After being reflected by the fourth reflector, it enters the focusing lens.

As a preferred solution, a light receiving cavity is provided inside the pump source, the mode-stripped optical fiber is arranged in the light receiving cavity, and a gold-plated cover plate is detachably installed on the opening of the light receiving cavity.

As a preferred solution, the focusing lens has an integrated structure, so as to realize the fast axis and slow axis focusing of the pump light emitted by the polarization beam combiner at the same time; or, the focusing lens includes sequentially arranged fast axes A focusing lens and a slow-axis focusing lens. The pumping light emitted from the polarization beam combiner passes through the fast-axis focusing lens and the slow-axis focusing lens in turn to perform fast-axis and slow-axis focusing respectively.

As a preferred solution, it also includes an indicating light module, the indicating light module includes an indicating light source module and a collimating lens, and the collimating lens is arranged in the light emitting direction of the indicating light source module; the indicating light source After being collimated by the collimating lens, the indicating light emitted by the module enters the focusing lens for focusing, and then passes through the stripping optical fiber before being stripped and output.

As a preferred solution, it also includes an indicating light input end, the indicating light input end is used to connect an external indicating light source, the indicating light emitted by the indicating light source is reflected by the fifth reflector and enters the focusing lens for focusing, and then passes through the Output after stripping the mode-stripping fiber.

The utility model also discloses a fiber laser, which includes the high-power laser pumping source of any one of the schemes above.

The beneficial effect of the utility model is that: a mode-stripping fiber is arranged in the laser pumping source, and the combined pump light is coupled into the mode-stripping fiber first after being focused by the fast axis and the slow axis of the focusing lens, and then coupled into the pumping light Unnecessary impurities in the light are stripped; since the mode stripped fiber is directly placed in the pump source, compared with the structure in which the mode stripped fiber is placed outside the pump source, the integration and structure of the laser pump source are improved of compactness. And the pump light is directly coupled into the mode-stripped fiber through the focusing lens. Compared with the transmission fiber coupling, the fusion process of the transmission fiber and the mode-stripped fiber, as well as the transmission fiber used in the fusion process, are omitted. The connection process between the stripped mode fiber and the pump source is simplified.

【Description of drawings】

One or more embodiments are exemplified by the corresponding drawings, and these exemplifications are not construed as limiting the embodiments. Elements with the same reference numerals in the drawings represent similar elements, unless otherwise specified Note that the drawings in the drawings are not limited to scale.

Fig. 1 is a schematic diagram of the decomposition structure of a laser pump source according to an embodiment of the present invention;

Fig. 2 is a schematic cross-sectional view of a laser pump source according to an embodiment of the present invention;

Fig. 3 is a schematic diagram of the orthographic projection of the first surface of the base according to an embodiment of the present invention;

Fig. 4 is a schematic diagram of the installation structure of the mode-stripped optical fiber in the optical receiving cavity according to an embodiment of the present invention;

Fig. 5 is a schematic structural view of the second surface of the base according to an embodiment of the present invention;

Fig. 6 is a schematic structural view of a cover plate with a channel in a cold zone according to an embodiment of the present invention;

Fig. 7 is a schematic structural view of another cover plate with a channel in a cold zone according to an embodiment of the present invention.

【detailed description】

In order to facilitate the understanding of the utility model, the utility model will be described in more detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that when an element is expressed as being “fixed on”/“fixed on”/“installed on” another element, it may be directly on the other element, or there may be one or more intervening elements therebetween. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or one or more intervening elements may be present therebetween. The terms "vertical", "horizontal", "left", "right", "inner", "outer" and similar expressions are used in this specification for the purpose of description only.

Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by those skilled in the technical field of the present invention. The terms used in the description of the utility model are only for the purpose of describing specific embodiments, and are not used to limit the utility model. The term "and/or" used in this specification includes any and all combinations of one or more of the associated listed items.

In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

As shown in Figures 1 to 7, the embodiment of the present invention provides a laser pumping source, including a base 1 and a cover plate 2, the base 1 is in the shape of a flat cuboid, so that the two side surfaces of the base 1 are oppositely arranged , has a larger end surface area, here, the two opposite side surfaces of the base 1 are respectively named as the first surface and the second surface of the base 1 .

The first surface of the base 1 is provided with an overall recessed mounting groove 10 , and the mounting groove 10 is provided with a heat sink area 101 and a light emitting area 102 , and the light emitting area 102 is located on one side of the heat sink area 101 . The heat sink area 101 is packaged with a plurality of light source modules 100 for emitting pump light, and the plurality of light source modules 100 are arranged in a staggered manner so that the light source modules 100 do not interfere with each other and prevent the light emitted by the light source modules 100 from being captured by other light source modules. 100 shield or interfere with each other, and an optical lens is also provided on the heat sink area 101. The optical lens includes the same number as the number of light source modules 100, and is arranged sequentially along the light output direction of each light source module 100. 200 and the first mirror 300.

In the embodiment of the present invention, the light source module 100 can be a single laser chip or a single laser diode, or can be a bar (bar or diode bar) that integrates multiple laser chips or laser diodes on a substrate to form an independent package. Compared with a single laser chip or laser diode, a single bar has a higher output power, which is conducive to improving the integration of the pump source and increasing the output power of the pump source.

Specifically, as shown in FIG. 3, at least one stepped heat sink is provided in the heat sink area 101, and each stepped heat sink includes a strip-shaped first heat sink 12 and the number is the same as that of the first heat sink 12. 1. A second heat sink 13 in the shape of a strip, the first heat sink 12 and the second heat sink 13 are arranged side by side. A plurality of light source modules 100 are arranged at intervals on the first heat sink 12. Similarly, an optical lens unit composed of a first collimating mirror 200 and a first reflector 300 corresponding to one light source module 100 is placed on the second heat sink. 13 are arranged at intervals. In this way, more light source modules 100 can be packaged in the base of the pump source with a smaller volume, the integration of the light source modules in the pump source is improved, and the high integration of the pump source structure and the pump source are achieved. High power output of power.

The heat sink area 101 is provided with a plurality of step heat sinks, and each step heat sink is provided with a first heat sink 12 and a second heat sink 13, and the first heat sink 12 includes a plurality of second heat sinks arranged along its length direction. A heat sink unit (not shown), so that the light source modules 100 form an array distribution on the stepped heat sink, and a plurality of first heat sink units are formed from the outer end of the first heat sink 12 to the inner end of the first heat sink 12. to a low step-like distribution. The second heat sink 13 includes a plurality of second heat sink units (not marked) arranged along its length direction, and the plurality of second heat sink units are formed from the outer end of the second heat sink 13 to the inner end of the second heat sink 13 Ladder distribution from high to low.

Wherein each first heat sink unit is provided with a package plane, the light source module 100 is correspondingly fixed on the package plane, each second heat sink unit is provided with an optical lens positioning device (not marked), the first collimator Both the mirror 200 and the first reflection mirror 300 are positioned on the second heat sink unit through the optical lens positioning device, and are bonded and fixed to the second heat sink unit through heat-conducting glue.

Each stepped heat sink is provided with a first heat sink 12 and a second heat sink 13 , so that the corresponding first heat sink unit and the second heat sink unit are arranged on the same step. A light source module 100 can be installed on each first heat sink unit, and a first collimating mirror 200 and a first reflector 300 can be installed on each second heat sink unit.

Since the first heat sink unit and the second heat sink unit are arranged in steps from high to low, it is possible to make the first reflector 300 on two adjacent second heat sink units of the same second heat sink 13 The reflection centers of the reflectors will not coincide with each other, so that the reflection center of the first reflector 300 arranged on the high step surface is higher than the top of the first reflector 300 arranged on the low step surface, thereby realizing the reflection of any first reflector 300 The light beam is not blocked by other first reflectors 300, so that the effective propagation of the light beam is realized.

Multiple stepped heat sinks are divided into high-step heat sinks and low-step heat sinks. The high-step heat sinks and low-step heat sinks are arranged alternately. The lowest high step of the high-step heat sink is one step higher than the highest low step of the low-step heat sink. high. The light source modules 100 do not interfere with each other, and the light emitted by the light source modules 100 is prevented from being blocked by other light source modules 100 or interfering with each other.

For example, there are 8 stepped heat sinks in the heat sink area 101, 4 of which are high-step heat sinks, and the remaining 4 are low-step heat sinks. The arrangement of heat sinks and low-step heat sinks is from the two opposite sides of the base 1 to the centerline A of the base 1 in the form of high-step heat sinks-low-step heat sinks-high-step heat sinks-low-step heat sinks arrangement.

Correspondingly, eight first heat sinks 12 and eight second heat sinks 13 are also arranged in the heat sink area 101, and one first heat sink 12 and one second heat sink are correspondingly arranged on each high-level heat sink 13. Each first heat sink 12 is provided with 10 to 50 light source modules. Taking the light source module 100 as a single laser chip as an example, the power of a single laser chip can reach 15-35W. Each second heat sink 13 is provided with 10 to 50 light source modules. 50 first collimating mirrors 200 and first reflecting mirrors 300 . In this way, the total output power of a single pump source can reach the range of 1.5-6KW (kilowatts) through the superposition of multiple light source modules 100, and the pump light integrated and output by the laser chip has the characteristics of high brightness and high power density, which can realize the use of A small-diameter transmission fiber is used for pumping light output, for example, a 135-micron transmission fiber can be used for pumping light output to achieve high-power, high-brightness laser output.

An optical lens is provided on the light exit area 102 to combine and output the pump light emitted by the plurality of light source modules 100 . Specifically, at least one polarization beam combiner 400 for outputting combined pump light is provided on the light exit area 102 , and the polarization beam combiner 400 is arranged in the light exit direction of the light source module 100 . The pump light emitted by the light source module 100 first passes through the first collimating mirror 200 for fast/slow axis compression collimation, and then is reflected by the first mirror 300 to the polarization beam combiner 400. After the pump light passes through the polarization beam combiner 400 , to form a combined beam of pump light.

In order to realize that the pump light emitted by the light source modules 100 provided on the plurality of first heat sinks 12 can all be reflected to the polarization beam combiner 400 to form a combined pump light, the light output area 102 is also provided with the number and the first A heat sink 12 has the same number of second reflectors 500 , and the second reflectors 500 are arranged in the light emitting direction of the light source module 100 . The second reflector 500 can change the transmission direction of the pumping light, so as to make reasonable use of the space of the installation groove 10 of the base 1 . The second reflector 500 can make the pumping light emitted by the light source module 100 arranged on the first heat sink 12, after being collimated by the corresponding first collimating mirror 200 and reflected by the first reflector 300, be reflected to the Each first heat sink 12 is correspondingly arranged on the second reflector 500, and then reflected by the second reflector 500 to the polarization beam combiner 400, after the pump light passes through the polarization beam combiner 400, the beams are combined to form a combined pump Light.

For example, in this embodiment, eight first heat sinks 12 and eight second heat sinks 13 are set, and correspondingly, eight second reflectors 500 are also set on the light exit area 102. The eight second reflectors 500 Corresponding to the light emitting directions of the light source modules 100 disposed on the eight first heat sinks 12 respectively. The light source modules 100 provided with eight first heat sinks 12 and the first collimating mirrors 200 and first reflectors 300 provided with eight second heat sinks 13 can be divided into two pump light output units correspondingly, named as the first The pump light output unit 1000 and the second pump light output unit 2000 .

Wherein, the first pumping light output unit 1000 includes a light source module 100 , a first collimating mirror 200 and a first reflecting mirror 300 corresponding to four stepped heat sinks on one side of the center line A of the base 1 . The second pump light output unit 2000 includes a light source module 100 , a first collimating mirror 200 and a first reflecting mirror 300 corresponding to the four stepped heat sinks on the other side of the center line of the base 1 . That is, each pump light output unit corresponds to include light source modules 100 disposed on four adjacent first heat sinks 12 and first collimator mirrors 200 and first collimating mirrors 200 disposed on four adjacent second heat sinks 13 . Mirror 300. Two polarization beam combiners 400 are provided, and each polarization beam combiner 400 corresponds to a pump light output unit, which combines the pump light output by the corresponding light source module 100 to form a combined pump light.

The polarization beam combiner 400 is provided with two light incident surfaces and a light exit surface 403, the two light incident surfaces are the first light incident surface 401 and the second light incident surface 402, and the polarization beam combiner 400 also includes a half-wave plate 405 , the half-wave plate 405 is disposed on the first light-incident surface 401 , specifically, the half-wave plate 405 is attached to the first light-incident surface 401 .

The polarization beam combiner 400 is arranged in front of the two stepped heat sinks close to the center line A of the base 1, and the pump light emitted by the light source module 100 provided on the high-step heat sink near the side wall of the base 1 of the first pump light output unit 1000 After the pump light is collimated by the corresponding first collimating mirror 200 and reflected by the first reflector 300, it is reflected to the second reflector 500 corresponding to the high-level heat sink, and then reflected by the second reflector 500 to the The first incident surface 401 of the polarization beam combiner 400 . Similarly, after the pumping light emitted by the light source module 100 provided by the low-level heat sink corresponding to the high-level heat sink is collimated by the corresponding first collimator mirror 200 and reflected by the first reflector 300, it is reflected to the The second reflection mirror 500 corresponding to the high-level heat sink is then reflected by the second reflection mirror 500 to the first light incident surface 401 of the polarization beam combiner 400 . Here, since the lowest high step of the high-step heat sink is higher than the highest low step of the low-step heat sink by one step height, the light from the second reflector 500 corresponding to the high-step heat sink can directly pass through the first step corresponding to the low-step heat sink. The top of the two reflectors 500 prevents light from being blocked or interfered.

The pump light emitted by the light source module 100 provided on the high-level heat sink near the centerline A of the base 1 of the first pump light output unit 1000 is collimated by the corresponding first collimating mirror 200 and reflected by the first reflecting mirror 300 Afterwards, it directly crosses the top of the corresponding second reflector 500 and reflects to the second incident surface 402 of the polarization beam combiner 400 . Similarly, after the pumping light emitted by the light source module 100 provided by the low-level heat sink corresponding to the high-level heat sink is collimated by the corresponding first collimator mirror 200 and reflected by the first reflector 300, it is reflected to the The second reflection mirror 500 corresponding to the high-level heat sink is reflected to the second light incident surface 402 of the polarization beam combiner 400 by the second reflection mirror 500 corresponding to the low-level heat sink.

Since the first incident surface 401 is provided with a half-wave plate 405, the pump light incident from the first incident surface 401 first enters the half-wave plate 405 before entering the first incident surface 401, so that the incident pump light Both the P light and the S light in the pumping light are rotated by 90°, and the S light rotated by 90° is converted into P light, and passes through the polarization splitting surface 404 in the polarization beam combiner 400 and enters the extinction channel (not shown in the figure). ) and is eliminated by the extinction channel, and after being rotated by 90°, the P light is transformed into S light, which is reflected by the polarization beam splitter 404 in the polarization beam combiner 400 and emitted from the light exit surface 403 to the half-wave plate 405. The P light in the pump light incident from the second light incident surface 402 passes through the polarization splitting surface 404 and is emitted from the light exit surface 403 to the half-wave plate 405, and the S light is reflected into the extinction channel (not shown) and is The matting channel is eliminated. The pump light emitted by the light source module 100 implementing the four first heat sinks 12 of the first pump light output unit 1000 is combined and emitted to the focusing lens 600 after passing through the polarization beam combiner 400 .

Since the second pump light output unit 2000 and the first pump light output unit 1000 are mirror images, the pump light emitted by the light source modules 100 of the four first heat sinks 12 of the second pump light output unit 2000 passes through the other After the polarization beam combiner 400 combines the beams, its transmission direction is perpendicular to the transmission direction of the combined pump light from the light source module 100 of the first pump light output unit 1000 . Therefore, it is necessary to install a third reflector 700 in the light emitting direction of the combined pump light from the light source module 100 of the second pump light output unit 2000, so that the light source module 100 of the second pump light output unit 2000 The combined pump light is rotated by 90° and sent to the focusing lens 600 .

In principle, in order to further increase the output power of the pump source, the first pump light output unit 1000 and the second pump light output unit 2000 can be infinitely expanded on one side or both sides of the center line A of the base 1, and only Ensure that the first pump light output unit 1000 or the second pump light output unit 2000 located on the same side of the center line A of the base 1 is arranged symmetrically along the center line A.

So far, the pump light emitted from all the light source modules 100 provided on the eight first heat sinks 12 corresponding to the first pump light output unit 1000 and the second pump light output unit 2000 can be combined by the corresponding polarization The beams are combined by the device 400 and emitted to the focusing lens 600. In some embodiments, the pump source may only include an integrated focusing lens 600 , which simultaneously realizes focusing on the fast axis and the slow axis of the pump light emitted by the polarization beam combiner 400 . In order to make the pump light finally output by the pump source have a better light speed quality, preferably, the focusing lens 600 includes a fast axis focusing lens 610 and a slow axis focusing lens 620 . That is, the pump light emitted from the polarization beam combiner 400 passes through the fast-axis focusing lens 610 and the slow-axis focusing lens 620 in sequence, and then is coupled into the transmission fiber 60, and finally the pump light is output from the transmission fiber 60, which can be used as a fiber laser light source.

Preferably, the mode-stripping fiber 800 can be arranged in front of the focusing lens 600 in the light-emitting direction. After the pump light is focused by the fast axis and the slow axis of the focusing lens 600, it is first coupled into the mode-stripping fiber 800, and the mode-stripping fiber 800 couples the incoming Unnecessary impurity light in the pump light is stripped, and then coupled into the transmission fiber 60, and finally the pump light is output from the transmission fiber 60, which can be used as a light source of a fiber laser.

As shown in Figure 4, the mounting groove 10 is provided with a downwardly recessed light receiving cavity 801, the stripping optical fiber 800 is installed in the light receiving cavity 801, and a gold-plated cover plate 802 is detachably installed on the opening of the light receiving cavity 801, The opening of the light receiving cavity 801 is sealed. The impurity light leaked from the stripped optical fiber 800 is collected in the optical receiving cavity 801 and absorbed by the optical receiving cavity 801 . Therefore, the impurity light stripped from the mode stripped optical fiber 800 can be prevented from leaking into the installation groove 10 at will, which will affect the combined output of the pump light.

The opposite ends of the light receiving cavity 801 are respectively provided with a first fixing groove 803 and a second fixing groove 804, and the two ends of the stripping optical fiber 800 are respectively fixed in the first fixing groove 803 and the second fixing groove 804, thereby Securely fix the stripped optical fiber 800 .

The first connecting platform 805 can also be arranged on the corresponding two sides of the first fixing groove 803, and the second connecting platform 806 can be arranged on the corresponding two sides of the second fixing groove 804. The plate 807 and the second fixing plate 808, the first fixing plate 807 can be fastened and connected to the first connection platform 805 by screws, and surround the first fixing groove 803 to form a fixing cavity to fix the end of the stripped optical fiber 800. Similarly, the second fixing plate 808 can be fastened to the second connection platform 806 by screws, and surrounds the second fixing groove 804 to form a fixing cavity to fix the end of the stripped optical fiber 800 .

The side wall of the light receiving cavity 801 is also provided with a heat dissipation structure for absorbing the heat generated in the light receiving cavity 801. The heat dissipation structure includes a plurality of cooling plates or fins arranged at intervals along the side wall of the light receiving cavity, or the heat dissipation structure Includes arrays of thermally conductive posts or pins. The heat dissipation structures of these structural forms can increase the heat dissipation area, and can quickly transfer the heat generated by the light receiving cavity.

Since the light receiving cavity 801 is directly set in the installation groove of the base 10, the stripping optical fiber 800 is directly set in the light receiving cavity 801, and the pumping light is directly passed through the stripped optical fiber after focusing on the fast axis and the slow axis of the focusing lens 600. The mode fiber 800 realizes the mode stripping in the base 1 of the pump source, which improves the integration and compactness of the laser pump source and reduces the weight of the pump source compared with the independent mode stripper , realizing the lightweight design of the pump source. And the pump light is directly coupled into the mode stripped fiber 800 through the focusing lens 600. Compared with the transmission fiber coupling, the welding process of the transmission fiber and the mode stripped fiber 800, and the welding process used The transmission optical fiber simplifies the connection process between the stripped mode optical fiber 800 and the pumping source.

As shown in FIG. 3 , in order to make the structure of the base 1 more compact and make reasonable use of the space of the mounting groove 10 of the base 1, a fourth reflector 900 can be arranged at the rear of the focusing lens 600 toward the focusing lens 600, from the polarization combining The pump light emitted from the light-emitting surface of the beam device 400 and the pump light reflected from the third reflector 700 are both reflected by the fourth reflector 900, the pump light is rotated by 90°, and then emitted to the focusing lens 600, and then from the The mode-stripping fiber 800 is coupled into the transmission fiber 60, and finally the pump light is output from the transmission fiber 60, which can be used as a light source of a fiber laser. In this way, the fast-axis focusing lens 610 , the slow-axis focusing lens 620 and the stripping fiber 800 can be arranged along the side of the base 1 , so that the internal structure of the base 1 is more compact and the space of the installation slot 10 of the base 1 can be reasonably utilized.

In addition, an indicating light module 3000 can also be installed on the installation groove. The indicating light module 3000 includes an indicating light source module (not marked) and a collimating lens (not marked). superior. In this embodiment, the indicating light source module and the collimating lens are packaged together to form a TO package structure, and a mounting hole is provided on the side wall of the base 1, and the indicating light module 3000 is disposed in the mounting hole. The indicator light emitted by the indicator light module 3000 is red light, and the wavelength band of the red light is 620-760nm. In other embodiments, the indicator light module 3000 can also be an indicator light module of other colors.

The collimation indicating light emitted by the indicating light module 3000 can be directly input into the focusing lens 600, after being focused by the fast axis and the slow axis of the focusing lens 600, it is coupled into the stripped optical fiber 800, and then coupled into the transmission optical fiber 60, and finally the indicating light Along with the pump light output from the delivery fiber 60, the indicator light can be used as the indicator light source of the fiber laser.

In order to make the structure of the base 1 more compact and make reasonable use of the space in the mounting groove 10 of the base 1, a fifth reflector 1100 can be installed in the light emitting direction of the indicating light module 3000, and the indicating light can be changed through the fifth reflecting mirror 1100 The transmission direction of the indicator light is reflected to the focusing lens 600 . In this way, the installation position of the indicating optical module 3000 is not limited to a certain fixed position, and the installation position of the indicating optical module 3000 can be adjusted according to the specific design and layout of the base 1 .

As shown in Fig. 3, in other embodiments, an indicating light input end may also be provided on the installation groove 10, the indicating light input end is used to connect an external indicating light source, and a fifth reflector is arranged in front of the indicating light input end, The indicator light output by the external indicator light source is reflected to the focusing lens 600 through the fifth reflector 1100, after being focused by the fast axis and the slow axis of the focusing lens 600, it is coupled into the stripped optical fiber 800, and then coupled into the transmission optical fiber 60, Finally, the indicating light and the pumping light are output from the transmission fiber 60, and the indicating light can be used as an indicating light source of the fiber laser.

In some embodiments, a conductive rail 18 is provided between two adjacent stepped heat sinks at one end close to the light-emitting area. The conductive rail 18 can be a conductive copper sheet or a conductive aluminum sheet, and the conductive rail 18 connects the two adjacent steps. The heat sink is electrically connected, and the end of each stepped heat sink close to the side wall of the base 1 is connected to an electrical pin 19 for connecting the power supply end, so that the two stepped heat sinks, the conductive rail 18 and the two electrical pins 19 are combined A series connection circuit is formed with the power supply end, so that the power supply end supplies power to the light source modules 100 on the two stepped heat sinks, realizing the staged power supply of multiple stepped heat sinks of the pump source. It can avoid the burning of the light source modules 100 due to too many light source modules 100 installed on the ladder heat sink, and the excessive heat generation of the ladder heat sink and the conductive rail 18 due to excessive power supply current. High, which will affect the heat dissipation of the base 1 of the pump source.

The cover plate 2 is detachably mounted on the first surface of the base 1 to seal the opening of the installation groove 10, and the cover plate 2 is locked on the base 1 by screws, and is used to secure the light source module 100, the optical lens and the stripped optical fiber 800 and so on are packaged.

The base 1 is also provided with a bottom plate 3, the second surface of the base 1 is provided with a heat dissipation area, and the position opposite to the heat sink area 101 is provided with a first cooling chamber 20 which is integrally recessed, so that the first cooling chamber 20 is in contact with the heat sink area 101. The sink area 101 is located opposite to each other. The first partition 11 extending outward from the bottom is provided inside the first cooling chamber 20 . The first partition 11 continuously divides the first cooling chamber 20 into cooling grooves for guiding the flow of cooling medium.

As shown in Figure 5, the bottom plate 3 is covered on the second surface, and is connected with the extended side wall of the first cooling cavity 20 and the extension end of the first partition 11 by brazing and sealing, so that the bottom plate 3 and the cooling tank are enclosed and formed For the heat dissipation channel, the side wall of the base 1 is provided with a cooling medium inlet 30 and a cooling medium outlet 40 , one end of the heat dissipation channel communicates with the cooling medium inlet 30 , and the other end of the heat dissipation channel communicates with the cooling medium outlet 40 .

Since the light source module 100 and optical lenses such as the first collimating mirror 200 and the first reflector 300 are installed and fixed in the heat sink area 101, and the position of the heat dissipation channel is opposite to the position of the heat sink area 101, the light source module 100 and the optical lenses produce The heat can be directly transferred to the heat dissipation channel opposite to the heat sink area 101 through the material of the base 1 located in the heat sink area 101, and fully contact with the cooling medium (such as cooling water, refrigerant, cooling gas, etc.) in the heat dissipation channel, Thus being quickly taken away by the flowing cooling medium. Since the heat generated by the light source module 100 and the optical lens can be directly transferred to the heat dissipation channel opposite to the heat sink area 101 through the material of the base 1 located in the heat sink area 101, the heat transfer distance is shorter, the thermal resistance is smaller, and the response speed is faster. , thus improving the heat dissipation efficiency, especially suitable for the cooling and heat dissipation of high-power pump sources assembled by multiple high-power light source modules, for example, the cooling and heat dissipation of laser pump sources with a single output power of KW (kilowatt) level.

Moreover, since the heat dissipation channel is directly arranged on the base 1, the base of the pump source has its own cooling function, and more light source modules 100 can be packaged in the base of the pump source with a smaller volume. Meet the heat dissipation requirements of the light source module 100, simplify the cooling structure layout of the laser pump source, make the structure of the laser pump source more compact, reduce the volume of the laser pump source, and reduce the research and development and manufacturing costs of the laser pump source .

As shown in FIG. 5 , the cooling groove includes at least one first cooling groove 201 corresponding to each first heat sink 12 and extending along the length direction of the first heat sink 12 and at least one first cooling groove 201 corresponding to each second heat sink 13 . At least one second cooling groove 202 corresponding to and extending along the length direction of the second heat sink 13 .

The ends of the first cooling grooves 201 corresponding to the adjacent first heat sinks 12 are laterally connected through the first connecting grooves 203, and the ends of the second cooling grooves 202 corresponding to the adjacent second heat sinks 13 are connected through the second connecting grooves. 204 are transversely connected so that the first cooling groove 201 , the first connecting groove 203 , the second cooling groove 202 and the second connecting groove 204 are surrounded by the bottom plate 3 to form a continuous heat dissipation channel.

The heat generated by the light source module 100 can be directly transferred to the cooling medium flowing in the first cooling tank 201 through the first heat sink 12 , while the heat generated by the first collimating mirror 200 and the first reflector 300 can be transferred through the second heat sink 13 directly transferred to the cooling medium flowing in the second cooling tank 202 .

The first cooling groove 201 extends along the length direction of the first heat sink 12, so that the direction of the first cooling groove 201 is consistent with the first heat sink 12, so that the cooling medium in the first cooling groove 201 can flow through the first heat sink 12 as much as possible. In the area where the heat sink 12 is located, the cooling medium in the first cooling tank 201 can fully contact the area where the first heat sink 12 is located, so as to improve cooling efficiency.

Similarly, the second cooling groove 202 extends along the length direction of the second heat sink 13, so that the direction of the second cooling groove 202 is consistent with the second heat sink 13, so that the cooling medium in the second cooling groove 202 can flow as much as possible. Through the area where the second heat sink 13 is located, the cooling medium in the second cooling groove 202 can fully contact the area where the second heat sink 13 is located, so as to improve cooling efficiency.

As shown in FIG. 3 , preferably, when the number of the first heat sink 12 and the second heat sink 13 is set to be multiple, the first heat sink 12 and the second heat sink 13 are arranged side by side, correspondingly, with each When there are multiple first cooling grooves 201 corresponding to one heat sink 12, the plurality of first cooling grooves 201 are arranged side by side along the width direction of the first heat sink 12; similarly, the first cooling grooves 201 corresponding to each second heat sink 13 When multiple second cooling grooves 202 are provided, the multiple second cooling grooves 202 are arranged side by side along the width direction of the second heat sink 13 .

As shown in Figure 2, the width and depth of the first cooling groove 201 are greater than the width and depth of the second cooling groove 202, so that the cross-sectional area of the first cooling groove 201 can be greater than the cross-sectional area of the second cooling groove 202, so , the flow distribution of the cooling medium in the first cooling groove 201 and the second cooling groove 202 can be changed, and more cooling medium can be introduced into the first cooling groove 201 for taking away the light source module 100 through the first heat sink 12 to transfer heat to the first cooling slot 201 to meet the normal heat dissipation requirements of the light source module 100 .

For example, the spacing between the two first partitions 11 forming the first cooling tank 201 is greater than the spacing between the two first partitions 11 forming the second cooling tank 202; The height of the first partition 11 is greater than the height of the two first partitions 11 forming the second cooling tank 202 .

A heat conduction structure 14 extending from the bottom to the outside can also be provided in the first cooling groove 201 at the installation position facing the light source module 100. The heat conduction structure 14 helps to quickly transfer the heat generated on the first heat sink 12, and at the same time can increase the The heat dissipation area enables the cooling medium to fully absorb the heat transferred by the first heat sink 12 and improves the cooling efficiency of the cooling medium in the first cooling tank 201 .

For example, the heat conduction structure 14 can be an integral heat conduction plate extending outward from the bottom of the first cooling groove 201; The bottom of the cooling groove 201 extends outwards, and the heat conduction fins are distributed at intervals. The heat conduction structures of these structural forms can increase the heat dissipation area, can quickly conduct the heat generated by the light source module 100, enable the cooling medium to fully absorb the heat transmitted by the first heat sink 12, and improve the cooling efficiency of the cooling medium in the first cooling tank 201 .

Preferably, a plurality of notches 110 are provided at intervals on the first partition 11, so that when the base 1 is integrally formed by a forging process, it is convenient to set reinforcing ribs on the forging die, and improve the structural strength and service life of the forging die. In order to prevent the notch 110 on the first partition 11 from affecting the cooling and heat dissipation of the light source module 100, the position of the notch 110 on the first partition 11 is set at the position corresponding to the interval between two adjacent light source modules 100, Because the gaps between two adjacent light source modules 100 generate less heat and have the least impact on the heat dissipation of the light source modules 100 as a whole, opening the notch 110 at these positions can avoid the weakening effect of the notch 110 on cooling and heat dissipation.

The vertical distance from each first heat sink unit to the bottom of the first cooling groove 201 is equal, so that the vertical distance from the light source module 100 arranged on the first heat sink unit to the bottom of the first cooling groove 201 is equal, which can ensure that the light source module 100 produces The distance traveled by the heat from each first heat sink unit to the first cooling groove 201 is consistent, so that each light source module 100 can be uniformly cooled. Similarly, the vertical distances from each second heat sink unit to the bottom of the second cooling groove 202 are equal, so that the vertical distances from the optical lenses arranged on the second heat sink unit to the bottom of the second cooling groove 202 are equal, which can ensure that the heat from The distance traveled by each second heat sink unit to the second cooling groove 202 is consistent, so that each optical lens can be uniformly cooled.

Theoretically speaking, the smaller the vertical distance from the light source module 100 of the first heat sink unit to the bottom of the first cooling tank 201, and the smaller the vertical distance from the optical lens of the second heat sink unit to the bottom of the second cooling tank 202, the more This is beneficial to the heat dissipation of optical lenses such as the light source module 100 and the first collimating mirror 200 and the first reflecting mirror 300 . However, affected by the process of encapsulating the base 1 and the bottom plate 3 by brazing, the smaller the distance, the more likely the base 1 will be deformed when heated. The vertical distance from the light source module 100 of the sink unit to the bottom of the first cooling tank 201 and the vertical distance from the optical lens of the second heat sink unit to the bottom of the second cooling tank 202 should not be less than 5 mm.

As shown in Figure 5, a flow distribution device is also provided near the cooling medium inlet 30 in the first cooling cavity 20, and the flow distribution device includes a flow distribution chamber communicating with the cooling medium inlet 30, the first cooling groove 201 and the second cooling groove 202 150 and the splitter plate 15 arranged in the splitter chamber 150, the splitter plate 15 divides the splitter chamber 150 into a first splitter tank (not marked) communicated with the first cooling tank 201 and a second splitter tank communicated with the second cooling tank 202 slot (not shown).

The distribution device helps to better distribute the cooling medium flowing into the cooling medium inlet 30 to the first cooling tank 201 and the second cooling tank 202 through the first distribution tank and the second distribution tank, so as to facilitate the cooling medium according to the cooling and heat dissipation requirements. It is more reasonable to distribute flow in the first cooling tank 201 and the second cooling tank 202 .

As shown in FIG. 3 and FIG. 5 , on the heat dissipation area on the second surface of the base 1 , a second cooling chamber 50 that is recessed as a whole is provided at a position opposite to the light emitting area 102 , and a second cooling chamber 50 extending from the bottom to the outside is provided in the second cooling chamber 50 . The second partition 16, the second partition 16 continuously separates the second cooling chamber 50 into a third cooling groove 501 that guides the flow of cooling medium, and a partition wall 17 is provided between the first cooling chamber 20 and the second cooling chamber 50 The first cooling chamber 20 is separated from the second cooling chamber 50 , leaving only the first cooling groove 201 and the second cooling groove 202 communicating with the third cooling groove 501 , and the third cooling groove 501 communicating with the cooling medium outlet 40 .

The heat generated by the optical lenses on the light exit area 102 and the stripped optical fiber 800 is transferred to the third cooling tank 501, and is absorbed by the cooling medium flowing in the third cooling tank 501, thereby realizing the cooling of the optical lenses and the stripped optical fiber on the light output area 102. 800 for cooling and heat dissipation.

In other embodiments, the heat dissipating channel can also be arranged in such a way that an overall inwardly recessed cavity is integrally forged and formed on the second surface of the base 1, and at least one metal tube (not shown), such as copper tube, is arranged in the cavity. tube or aluminum tube, so that the metal tube forms the heat dissipation channel. Alternatively, the metal pipe is directly welded to the second surface of the base 1 through a brazing process.

The metal tube can be bent and deformed arbitrarily, for example, the metal tube can be bent into the shape of the first, second, and third cooling grooves mentioned in the above embodiment, and the area where the metal tube is set and the stepped heat sink, optical lens and The position of the stripped mode fiber corresponds to that. Make the heat dissipation effect of the metal tube as close as possible to the heat dissipation effect of the cooling groove in the above embodiment.

In order to improve the thermal conductivity of the base 1 and the bottom plate 3 and the adhesion of the surface of the base 1 to the coating, the material of the base 1 and the bottom plate 3 can be materials with good thermal conductivity such as brass or aluminum.

The outer surface of the base 1 is provided with a gold-plated layer, a silver-plated layer, a tin-plated layer or a nickel-plated layer. The gold-plated layer, silver-plated layer, tin-plated layer or nickel-plated layer all have excellent electrical conductivity and thermal conductivity, and have good shaping properties for the light source emitted by the light source module, which can prevent the light source from astigmatizing. In particular, a silver-plated layer is provided on the surface of the stepped heat sink for encapsulating the light source module 100. The welding of the silver-plated layer to the light source module 100 will strengthen the adhesion and flowability, so that the light source module 100 and the silver-plated layer are completely bonded. No solder voids. In addition, silver, tin or nickel plating is less costly than gold plating, making the cost of the laser pump source more competitive.

As shown in FIG. 6 and FIG. 7, in order to further improve the overall heat dissipation capability of the laser pump source and optimize the heat dissipation environment of the laser pump source, a cooling channel 21 is also provided on the cover plate 2 for passing in a cooling medium to the cover. Plate 2 is cooled. In this way, the light source module 100 and the optical lens set in the heat sink area 101 of the installation groove 10, as well as the indicator light module 3000 set in the light output area 102 and the stripped optical fiber 800 in the light receiving cavity 801, can be installed on the base 1 In addition to heat dissipation and cooling through the heat dissipation channels, cooling channels 21 can also be provided on the cover plate 2 for heat dissipation and cooling, so that the heat dissipation efficiency of the laser pump source can be further improved.

In addition, other heat-generating components of the laser pump source can also be arranged on the outer surface of the cover plate 2, for example, the active optical fiber can be directly coiled on the outer surface of the cover plate 2, and a cooling channel can be provided on the cover plate 2 21 for cooling the active optical fiber. Specifically, the optical fiber tray can be directly fixed on the outer surface of the cover plate 2, or an optical fiber groove for coiling the active optical fiber can be directly processed on the outer surface of the cover plate.

As shown in FIG. 6 , in some embodiments, the cover plate 2 is a one-piece structure cover plate, and the cooling channel 21 is directly processed in the cover plate 2 , for example, the straight-through cooling channel 21 is directly processed by drilling. A cooling source inlet 23 and a cooling source outlet 24 communicating with the cooling channel 21 are provided on the side wall of the cover plate 2 .

As shown in FIG. 7, in some embodiments, the cover plate 2 is a split structure, and the cover plate 2 includes a first cover plate 21 and a second cover plate 22, wherein the first cover plate 21 is attached to the second cover plate There is an integral recessed area on one side, and a plurality of spaced apart flanges 212 extend from the bottom to the outside of the recessed area, and the plurality of spaced apart flanges 212 continuously separate the recessed area into a channel for guiding the flow of cooling medium. groove 211 . The second cover plate 22 and the first cover plate 21 are hermetically connected by brazing to seal the opening of the recessed area, so that the groove 211 and the second cover plate 21 are hermetically fitted to form a cooling channel. A cooling source inlet 23 and a cooling source outlet 24 communicating with the cooling channel are provided on the side wall of the cover plate 2 .

In some embodiments, the cover plate 2 is a one-piece structure cover plate, and at least one metal tube (not shown), such as a copper tube or an aluminum tube, is welded on the outer surface of the cover plate 2 so that the metal tube forms a cooling channel.

The packaging process of the above laser pump source is as follows:

S1. A base blank is provided, and a base having a first surface and a second surface is directly processed on the base blank to obtain a semi-finished product of the base.

including processing a plurality of first partitions extending outward from the bottom in the heat dissipation area and keeping in line with the length direction of the stepped heat sink, and arranging the plurality of first partitions at intervals along the width direction of the stepped heat sink, The first partition continuously separates the cooling groove in the heat dissipation area.

Processing a strip-shaped first heat sink for mounting the light source module on each of the stepped heat sinks, and processing a strip-shaped second heat sink for mounting the optical lens, And the first heat sink and the second heat sink are arranged side by side.

Specifically, a forging process is adopted, and the base material is integrally forged and formed by a forging die to form a base having a first surface and a second surface.

It includes integrally forming a downwardly recessed installation groove on the first surface of the base, a plurality of stepped heat sinks arranged in the installation groove, and a light receiving cavity for stripping the mold.

And on the second surface of the base, a downwardly recessed heat dissipation area is integrally formed, including the first cooling cavity and the second cooling cavity, and the cooling grooves arranged in the heat dissipation area, including the first cooling groove, the second cooling groove and the second cooling groove. Three cooling tanks.

The forging process has many advantages such as high production efficiency, simple process, saving a lot of machining processes and machining equipment, saving raw materials, etc., can reduce the manufacturing cost of the pump source, is suitable for mass production, and improves the production of the pump source. efficiency.

In addition, machining such as milling may also be used to directly process the base having the first surface and the second surface on the base blank.

It includes milling a downwardly recessed installation groove on the first surface of the base, a plurality of stepped heat sinks arranged in the installation groove, and a light receiving cavity for mold stripping.

And on the second surface of the base, a downwardly recessed cooling area is milled, including the first cooling cavity and the second cooling cavity, and the cooling slots located in the cooling area, including the first cooling slot, the second cooling slot and the third cooling slot. cooling tank.

S2. Carry out CNC finishing on the semi-finished product of the base made in step S1, and process a packaging plane for packaging the light source module and an optical lens positioning device for positioning the optical lens on the stepped heat sink by CNC.

S3. The base plate and the second surface of the base are sealed and connected by a brazing process, so that the base and the base plate are welded to form an integrated pump source base, so as to encapsulate the heat dissipation area as a whole, so that the base plate is connected with the first cooling tank and the second cooling tank. and the third cooling groove to form a heat dissipation channel.

Specifically, a layer of liquid solder is first applied on the extension end surface of the heat dissipation area of the base and the end surface of the extension end of the first partition forming the cooling groove, or on the extension end surface of the heat dissipation area of the base and the first partition forming the cooling groove Place an appropriate amount of solder piece on the end face of the extension end. Next, the base plate is placed over the base, covered with liquid solder or solder flakes, and placed in a shaping mold. Heat the shaping mold, control the heating temperature, melt the liquid solder or solder sheet, weld the base and the bottom plate to form a pump source base with an integrated structure.

S4. In step S3, the outer surface of the pump source base is welded to form an electrochemical surface treatment, so that an electroplating layer is formed on the outer surface of the pump source base;

For example, electroplating silver or electroplating gold is performed on the outer surface of the pump source base, so that the outer surface of the pump source base is covered with a layer of silver plating or gold plating.

Wherein, the process of electroplating silver comprises the following steps:

S401. Carry out the first degreasing cleaning on the base of the pump source, dry and then perform sandblasting, then perform the second degreasing cleaning, dry and set aside, the first degreasing cleaning and the second degreasing cleaning All are carried out in an ultrasonic cleaning machine, the frequency is set at 40-60 Hz, and the temperature is controlled at 50°C-60°C. This is the pre-step of the silver plating stage;

S402. Perform the following process on the base of the pump source to complete the silver plating process: pickling→cleaning→copper plating→cleaning→activation→cleaning→nickel plating→cleaning→activation→cleaning→pre-silver plating→silver plating→cleaning→silver Protective agent → cleaning → dehydration → drying; the specific requirements are as follows:

Pickling: Dilute hydrochloric acid Pickling: Hydrochloric acid concentration: 5-10%;

Cleaning: Use clean and clean circulating water in the pool for cleaning;

Copper plating: copper plating on the surface of the base material, the parameters of the copper plating liquid tank are: copper oxide concentration: 20-40g/L, sodium oxide concentration: 10-15g/L, temperature control 55-65°C, time 5min;

Activation: dilute hydrochloric acid activation: hydrochloric acid concentration: 5-10%, activation time: 5-10s;

Nickel plating: nickel plating on the surface of the substrate, the parameters of the nickel plating liquid tank are: nickel sulfate content: 200-300g/L, nickel chloride content: 40-60g/L, boric acid content: 40-60g/L; coating thickness: Nickel 3 ~ 5μm; and conduct the Harley test;

Pre-plating silver: The parameters of the silver-plating liquid tank are: metal silver content: 1-3g/L, potassium chloride content: 90-120g/L;

Silver plating: The parameters of the silver plating liquid tank are: metal silver content: 10-20g/L, potassium chloride content: 100-150g/L, and the total thickness of the silver plating layer is 0.0025-0.006mm through pre-silver plating and silver plating processes ;

Coating silver protective agent: coating silver protective agent on the surface of the silver plating layer;

S403. Reliability testing to obtain a finished product. Among them, the reliability test includes the following items: coating thickness, tape stripping, pendulum test, dyne pen test, ultrasonic cleaning, high temperature baking and neutral salt spray. Specific requirements are as follows:

Coating thickness: detected by X-ray fluorescence instrument, nickel 3-5μm, silver 3-6μm;

Adhesive tape peeling: 3M 600 adhesive tape 180°press flat peeling test three times;

Grid test: cut 1*1mm small grid with a 100-grid knife, press 3M adhesive tape vertically three times, and the shedding area is less than 10%;

Dyne pen test: draw a 100mm long ink strip, and observe whether more than 90% of the ink strip edges shrink and form ink droplets within 2 seconds;

Ultrasonic cleaning: Ultrasonic cleaning with deionized water for 15 minutes without liquid residue in the threaded hole;

High temperature baking: 240 degrees high temperature baking for 30 minutes, natural cooling in the oven to see if there are skin bulges;

Neutral salt spray: 24h neutral salt spray, whether there are bubbles, black, yellow and spots on the surface;

S5. Packaging the light source module and optical lens, welding and fixing the light source module on the packaging plane processed by CNC in step S2, positioning the optical lens through the optical lens positioning device, and bonding and fixing the optical lens with heat-conducting glue On the second heat sink unit of the stepped heat sink.

S6. Encapsulation of the stripping optical fiber, install and fix the stripping optical fiber in the optical receiving cavity, and then lock the gold-plated cover plate on the optical receiving cavity to seal the opening of the optical receiving cavity to complete the packaging of the stripping optical fiber .

S7. Encapsulating the cover plate, fastening the cover plate on the first surface of the base with screws, sealing the opening of the installation groove of the base, so as to package the light source module and the optical lens in the installation groove as a whole.

Specifically, a circle of threaded holes is provided at intervals on the extension end surface of the mounting groove of the base, and the cover plate is fastened to the base by screws passing through the cover plate and mated with the threaded holes.

To sum up: the pump source implemented in the utility model, since the heat dissipation channel is directly arranged on the base 1, the base of the pump source has its own cooling function, and by setting a plurality of modules on the base 1 for packaging the light source 100 and the stepped heat sink of the optical lens can realize the centralized packaging of more light source modules 100 in the base 1 of the smaller pump source, realizing highly integrated packaging of the light source module 100 and high power output of the pump source . At the same time, the heat dissipation requirements of the light source module 100 can be met, and the cooling structure layout of the laser pump source is simplified.

In addition, the stepped heat sink, the light receiving cavity for mold stripping and the cooling groove for guiding the flow of cooling medium are all directly processed on the base 1 by forging or milling, which can make the structure of the laser pump source more compact and reduce the The volume of the laser pump source is reduced, the weight of the laser pump source is reduced, the lightweight design of the pump source is realized, and the research and development and manufacturing costs of the laser pump source are reduced.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present utility model, rather than to limit them; Combinations, steps can be implemented in any order, and there are many other variations of the different aspects of the utility model as described above, which are not provided in detail for the sake of brevity; although the utility model has been described in detail with reference to the foregoing embodiments, Those skilled in the art should understand that: it is still possible to modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not deviate from the essence of the corresponding technical solutions The scope of the technical solutions of each embodiment of the utility model.

Claims (10)

1. A high-power laser pumping source, characterized in that, comprises a plurality of light source modules, the first collimating lens and the first reflector, polarization beam combiner, focusing lens and stripping mold identical to the number of said light source modules optical fiber; among them, The first collimating lens, the first reflecting mirror, the polarization beam combiner and the focusing lens are sequentially arranged in the light emitting direction of the light source module; After the pump light emitted by the light source module is collimated by the first collimator lens, it is reflected by the first mirror to the polarization beam combiner for superimposed coupling output, and the focusing lens focuses the superimposed coupled pump light and then inputs The mode-stripping fiber is stripped, and the pump light after the mode-stripping is output from the transmission fiber. 2. The high-power laser pumping source according to claim 1, characterized in that, a plurality of said light source modules are arranged in an array, and the light source modules in each row are arranged in a staggered order from high to low, and each light source module is set correspondingly A first collimating mirror and a first reflecting mirror; the pumping source also includes a second reflecting mirror having the same number as the number of columns of the light source module and facing the first reflecting mirror; The polarization beam combiner includes a first light-incident surface and a second light-incident surface, and the pumping light emitted by at least one row of light source modules is reflected to the second reflector by the first reflector, and is reflected by the second reflector to the second reflector. The first light incident surface; the pumping light emitted by at least one row of light source modules in the remaining light source modules is reflected by the first reflector to the second reflector, and is reflected by the second reflector to the second incident light noodle. 3. The high-power laser pumping source according to claim 2, characterized in that, the pumping source is provided with 8 stepped heat sinks, and each stepped heat sink includes a strip-shaped first heat sink arranged side by side and a second heat sink, the light source modules are arranged at intervals on the first heat sink to form an array distribution, and the first collimating mirror and the first reflector are correspondingly arranged on the second heat sink; the polarizing There are two beam combiners, and a polarization beam combiner is provided for every four adjacent heat sinks, wherein the pump light emitted by the light source modules on the two adjacent first heat sinks is reflected into the first heat sink. On the first light incident surface, the pump light emitted by the light source modules on the remaining two first heat sinks is reflected into the second light incident surface. 4. The high-power laser pumping source according to claim 3, wherein the polarization beam combiner also includes a light exit surface, and the pumping source also includes a third reflector, and the third reflector The mirror is set toward the light exit surface of one of the polarization beam combiners; the pump light emitted from the light exit surface of one of the polarization beam combiners directly enters the focusing lens, and the pump light exits from the light exit surface of the other polarization beam combiner The light enters the focusing lens after being reflected by the third mirror. 5. according to the described high-power laser pumping source of claim 4, it is characterized in that, the rear of described focusing lens, facing described focusing lens is also provided with a fourth reflective mirror, the pump that emerges from the light exit surface of polarization beam combiner Both the pump light and the pump light reflected from the third reflector enter the focusing lens after being reflected by the fourth reflector. 6. The high-power laser pumping source according to claim 1, wherein a light receiving cavity is arranged inside the pumping source, the stripped mode fiber is arranged in the light receiving cavity, and the light receiving cavity The cavity opening is detachably fitted with a gold-plated cover. 7. The high-power laser pumping source according to claim 1, characterized in that, the focusing lens has an integrated structure, so as to realize the fast-axis and slow-axis of the pump light emitted by the polarization beam combiner at the same time. Axis focusing; Alternatively, the focusing lens includes a fast-axis focusing lens and a slow-axis focusing lens arranged in sequence, and the pumping light emitted from the polarization beam combiner sequentially passes through the fast-axis focusing lens and the slow-axis focusing lens respectively for fast-axis and slow-axis focusing. axis focus. 8. The high-power laser pumping source according to claim 1, further comprising an indicating light module, the indicating light module comprising an indicating light source module and a collimating lens, the collimating lens is set In the light output direction of the indicating light source module; after the indicating light emitted by the indicating light source module is collimated by the collimating lens, it enters the focusing lens for focusing, and then passes through the stripping optical fiber after stripping output. 9. The high-power laser pumping source according to claim 1, further comprising an indicating light input end, the indicating light input end is used for connecting an external indicating light source, and the indicating light emitted by the indicating light source passes through The fifth reflection mirror enters the focusing lens for focusing, and then passes through the stripped optical fiber to output the mode after stripping. 10. A fiber laser, characterized in that it comprises the high-power laser pumping source according to any one of claims 1 to 9.

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