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 pumping source and fiber laser

[ technical field ] A method for producing a semiconductor device

The embodiment of the utility model provides a relate to laser processing technology field, especially relate to a high power laser pumping source and fiber laser.

[ background of the invention ]

In recent years, with the continuous development and popularization of laser technology, more and more traditional manufacturing industries adopt the laser technology to improve the processing quality and simultaneously greatly improve the processing efficiency. In recent two years, the fiber laser continuously expands the application of the fiber laser in high-end manufacturing industries such as energy-saving automobiles, aerospace, steamships, high-speed rails, high-power cleaning and cutting and the like by improving the laser power and the beam quality. The technical problem of traditional processing is greatly solved, and processing production efficiency is improved simultaneously. As the most core device of the optical fiber laser, the pump source is continuously explored and broken through in the aspects of higher power and higher brightness in design, and the output power of a single pump source of part of enterprises reaches KW (kilowatt) level.

According to the existing optical fiber laser, the mode stripping optical fiber and the laser pump source are separately and independently arranged, the mode stripping optical fiber is welded with the transmission optical fiber of the pump source in a welding manner, the connection process and the welding point of the mode stripping optical fiber and the pump source are increased, and the welding point is harmful to the transmission of pump light and is not beneficial to the transmission of the pump light. And a region is required to be separately arranged on the fiber laser to install the mode stripping fiber, so that the volume of the fiber laser is increased.

[ Utility model ] content

The embodiment of the utility model provides a aim at providing a high power laser pumping source and fiber laser, will shell in the direct integrated pumping source of mould optic fibre, reduced laser pumping source research and development and manufacturing cost.

The embodiment of the utility model provides a solve its technical problem and adopt following technical scheme:

a high-power laser pumping source comprises a plurality of light source modules, first collimating lenses and first reflectors, polarization beam combiners, focusing lenses and mode stripping optical fibers, wherein the number of the first collimating lenses and the first reflectors is the same as that of the light source modules; 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 superposed and coupled pump light is focused by the focusing lens and then is input into the mode stripping optical fiber for stripping, and the pump light after stripping is output from the transmission optical fiber.

As a preferred scheme, the plurality of light source modules are distributed in an array, the light source modules in each row are staggered from high to low in sequence, and each light source module is correspondingly provided with a first collimating mirror and a first reflecting mirror; the pumping source also comprises second reflectors, the number of the second reflectors is the same as that of the rows of the light source modules, and the second reflectors face the first reflectors; the polarization beam combiner comprises a first light incident surface and a second light incident surface, and pump light emitted by at least one row of light source modules is reflected to the second reflector through the first reflector and is reflected to the first light incident surface through the second reflector; and pump light emitted by at least one row of the rest light source modules is reflected to the second reflector through the first reflector and is reflected to the second light incident surface through the second reflector.

As a preferred scheme, the pumping source is provided with 8 stepped heat sinks, each stepped heat sink comprises a long strip shape and is provided with a first heat sink and a second heat sink side by side, the light source modules are arranged on the first heat sink at intervals to form array distribution, and the first collimating mirror and the first reflecting mirror are correspondingly arranged on the second heat sink; the number of the polarization beam combiners is 2, and every 4 adjacent stepped heat sinks are correspondingly provided with one polarization beam combiner, wherein the pump light emitted by the light source modules on the two adjacent first heat sinks is reflected to enter the first light inlet surface, and the pump light emitted by the light source modules on the remaining two first heat sinks is reflected to enter the second light inlet surface.

As a preferred scheme, the polarization beam combiner further includes a light emitting surface, the pump source further includes a third reflector, and the third reflector is disposed facing the light emitting surface of one of the polarization beam combiners; the pump light emitted from the light emitting surface of one polarization beam combiner directly enters the focusing lens, and the pump light emitted from the light emitting surface of the other polarization beam combiner enters the focusing lens after being reflected by the third reflector.

Preferably, a fourth reflector is further disposed behind the focusing lens and facing the focusing lens, and the pump light emitted from the light emitting surface of the polarization beam combiner and the pump light reflected from the third reflector are reflected by the fourth reflector and then enter the focusing lens.

Preferably, a light receiving cavity is arranged in the pumping source, the mold stripping optical fiber is arranged in the light receiving cavity, and a gold-plated cover plate is detachably mounted on an opening of the light receiving cavity.

As a preferred scheme, the focusing lens is of an integrated structure so as to simultaneously realize the focusing of a fast axis and a slow axis on the pump light emitted by the polarization beam combiner; or the focusing lens comprises a fast axis focusing lens and a slow axis focusing lens which are arranged in sequence, and the pump light emitted from the polarization beam combiner passes through the fast axis focusing lens and the slow axis focusing lens in sequence to be focused on the fast axis and the slow axis respectively.

As a preferred scheme, the device further comprises an indicating light module, wherein the indicating light module comprises an indicating light source module and a collimating lens, and the collimating lens is arranged in the light outgoing direction of the indicating light source module; and the indicating light emitted by the indicating light source module is collimated by the collimating lens, then enters the focusing lens for focusing, and is output after being stripped by the stripping optical fiber.

Preferably, the optical fiber stripping device further comprises an indicating light input end, the indicating light input end is used for being connected with an external indicating light source, indicating light emitted by the indicating light source enters the focusing lens through reflection of a fifth reflector for focusing, and is output after being stripped through the stripping optical fiber.

The utility model also discloses a fiber laser, including the high power laser pumping source of above-mentioned arbitrary scheme.

The utility model has the advantages that: a mode stripping optical fiber is arranged in a laser pumping source, the combined pumping light is focused by a fast axis and a slow axis of a focusing lens and then is coupled into the mode stripping optical fiber, and unnecessary impurity light in the coupled pumping light is stripped; because the mode stripping optical fiber is directly arranged in the pumping source, compared with the structure that the mode stripping optical fiber is arranged outside the pumping source, the integration level and the structure compactness of the laser pumping source are improved. And 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 welding process of the transmission optical fiber and the mode stripping optical fiber and the transmission optical fiber used in the welding process are omitted, and the connecting process of the mode stripping optical fiber and the pump source is simplified.

[ description of the drawings ]

One or more embodiments are illustrated in drawings corresponding to, and not limiting to, the embodiments, in which elements having the same reference number designation may be represented as similar elements, unless specifically noted, the drawings in the figures are not to scale.

Fig. 1 is an exploded view of a laser pumping source according to an embodiment of the present invention;

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

fig. 3 is a schematic front projection view of a first surface of a base according to an embodiment of the present invention;

fig. 4 is a schematic view of an installation structure of a mode stripping optical fiber in a light receiving cavity according to an embodiment of the present invention;

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

fig. 6 is a schematic structural diagram of a cover plate with a cold area passage according to an embodiment of the present invention;

fig. 7 is a schematic structural diagram of another cover plate with a cold area channel according to an embodiment of the present invention.

[ detailed description ] embodiments

In order to facilitate understanding of the present invention, the present invention will be described in more detail with reference to the accompanying drawings and specific embodiments. It should be noted that when an element is referred to as being "fixed to"/"mounted to" another element, it can be directly on the other element or one or more intervening elements may be present therebetween. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may be present. The terms "vertical," "horizontal," "left," "right," "inner," "outer," and the like as used herein are for descriptive purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

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

Referring to fig. 1 to 7, an embodiment of the present invention provides a laser pumping source, which includes a base 1 and a cover plate 2, wherein the base 1 is a flat cuboid, and two side surfaces of the base 1 are opposite to each other, and have a larger end surface area, and here, the two side surfaces of the base 1 are named as a first surface and a second surface of the base 1, respectively.

The first surface of base 1 is equipped with whole sunken mounting groove 10, is equipped with heat sink area 101 and goes out light zone 102 in this mounting groove 10, goes out light zone 102 and is located one side of heat sink area 101. The heat sink region 101 is packaged with a plurality of light source modules 100 for emitting pump light, the light source modules 100 are arranged in a staggered manner, so that the light source modules 100 do not interfere with each other, light rays emitted by the light source modules 100 are prevented from being shielded by other light source modules 100 or interfering with each other, optical lenses are further arranged on the heat sink region 101, the optical lenses comprise the same number as that of the light source modules 100, and the first collimating lenses 200 and the first reflecting mirrors 300 are sequentially arranged in the light emitting direction of each light source module 100.

In the embodiment of the present invention, the light source module 100 may be a single laser chip or a single laser diode, and may also be a bar (bar or diode bar) formed by integrating a plurality of laser chips or laser diodes on a substrate to form an independent package. Compared with a single laser chip or a laser diode, the single bar has higher output power, and is beneficial to improving the integration level of the pump source and improving the output power of the pump source.

Specifically, as shown in fig. 3, at least one stepped heat sink is disposed in the heat sink area 101, each stepped heat sink includes a first heat sink 12 having a long strip shape and second heat sinks 13 having the same number as the first heat sinks 12 and having long strip shapes, and the first heat sinks 12 and the second heat sinks 13 are disposed side by side. A plurality of light source modules 100 are arranged at intervals on the first heat sink 12, and similarly, an optical lens unit composed of one first collimating mirror 200 and one first reflecting mirror 300 corresponding to one light source module 100 is arranged at intervals on the second heat sink 13. Therefore, more light source modules 100 are packaged in the base of the pumping source with smaller volume in a centralized manner, the integration level of the light source modules in the pumping source is improved, and the high integration level of the pumping source structure and the high-power output of the power of the pumping source are realized.

The heat sink area 101 is provided with a plurality of stepped heat sinks, each stepped heat sink is provided with a first heat sink 12 and a second heat sink 13, the first heat sink 12 comprises a plurality of first heat sink units (not marked) arranged along the length direction of the first heat sink, so that the light source modules 100 form array distribution on the stepped heat sinks, and the plurality of first heat sink units are distributed in a stepped manner from high to low from the outer end of the first heat sink 12 to the inner end of the first heat sink 12. The second heat sink 13 includes a plurality of second heat sink units (not labeled) arranged along the length direction thereof, and the plurality of second heat sink units are distributed from the outer end of the second heat sink 13 to the inner end of the second heat sink 13 in a step shape from high to low.

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), and the first collimating mirror 200 and the first reflector 300 are positioned on the second heat sink unit through the optical lens positioning device and are bonded and fixed with the second heat sink unit through the heat-conducting glue.

Each stepped heat sink is provided with a first heat sink 12 and a second heat sink 13, and the first heat sink unit and the second heat sink unit which are corresponding in position are arranged on the same step. Each first heat sink unit may be correspondingly mounted with one light source module 100, and each second heat sink unit may be correspondingly mounted with one first collimating mirror 200 and one first reflecting mirror 300.

Because the first heat sink unit and the second heat sink unit are arranged in a stepped shape from high to low, the reflection centers of the first reflectors 300 on two adjacent second heat sink units of the same second heat sink 13 cannot coincide with each other, and the reflection center of the first reflector 300 arranged on a high step surface is higher than the top of the first reflector 300 arranged on a low step surface, so that the reflected light beam of any first reflector 300 is not shielded by other first reflectors 300, and the effective transmission of the light beam is realized.

The plurality of ladder heat sinks are divided into high ladder heat sinks and low-order ladder heat sinks, the high ladder heat sinks and the low-order ladder heat sinks are arranged alternately, the high step at the lowest position of the high ladder heat sinks is higher than the step height of the low step at the highest position of the low ladder heat sinks. The light source modules 100 do not interfere with each other, so as to prevent the light emitted by the light source modules 100 from being blocked by other light source modules 100 or interfering with each other.

For example, 8 stepped heat sinks are disposed in the heat sink region 101, wherein 4 stepped heat sinks are high-step heat sinks, and the remaining 4 stepped heat sinks are low-step heat sinks, and the 8 stepped heat sinks are disposed in a mirror image manner with respect to the centerline of the base 1, i.e., the high-step heat sinks and the low-step heat sinks are disposed in an alternating manner of high-step heat sinks-low-step heat sinks-high-step heat sinks-low-step heat sinks from two opposite sides of the base 1 toward the centerline a of the base 1.

Correspondingly, 8 first heat sinks 12 and 8 second heat sinks 13 are also arranged in the heat sink area 101, and 1 first heat sink 12 and 1 second heat sink 13 are correspondingly arranged on each high-step heat sink. 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 the single laser chip can reach 15 to 35W, and each second heat sink 13 is provided with 10 to 50 first collimating mirrors 200 and first reflecting mirrors 300. Thus, the total output power of a single pumping source can reach the range of 1.5-6KW (kilowatt) by overlapping a plurality of light source modules 100, and the pumping light which is output by integrating the laser chip has the characteristics of high brightness, high power density and the like, so that the pumping light output by adopting the transmission optical fiber with small core diameter can be realized, for example, the pumping light output by adopting the transmission optical fiber with 135 micrometers can be realized, and the high-power and high-brightness laser output can be realized.

The light exit area 102 is provided with an optical lens for combining and outputting the pump light emitted from the plurality of light source modules 100. Specifically, at least one polarization beam combiner 400 for outputting the combined pump light is disposed on the light exit region 102, and the polarization beam combiner 400 is disposed in the light exit direction of the light source module 100. The pump light emitted by the light source module 100 is firstly compressed and collimated in the fast/slow axis by the first collimating mirror 200, and then reflected to the polarization beam combiner 400 by the first reflecting mirror 300, and the pump light is combined into the combined pump light after passing through the polarization beam combiner 400.

In order to realize that the pump light emitted by the light source modules 100 arranged on the plurality of first heat sinks 12 can be reflected to the polarization beam combiner 400 to be combined into combined pump light, the light emergent area 102 is also provided with second reflecting mirrors 500 with the same number as that of the first heat sinks 12, and the second reflecting mirrors 500 are arranged in the light emergent direction of the light source modules 100. The second reflecting mirror 500 may change the transmission direction of the pumping light to make reasonable use of the space of the mounting groove 10 of the base 1. The second reflector 500 can make the pump light emitted by the light source module 100 disposed 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 second reflector 500 disposed corresponding to each first heat sink 12, and then be reflected to the polarization beam combiner 400 by the second reflector 500, and the pump light is combined into the combined pump light after passing through the polarization beam combiner 400.

For example, in the present embodiment, 8 first heat sinks 12 and 8 second heat sinks 13 are provided, and correspondingly, 8 second mirrors 500 are also provided on the light emergent area 102. The 8 second reflectors 500 are respectively disposed in the light emitting direction of the light source module 100 on the 8 first heat sinks 12. The light source module 100 provided with 8 first heat sinks 12 and the first collimating mirror 200 and the first reflecting mirror 300 provided with 8 second heat sinks 13 can be correspondingly divided into two pump light output units, which are named as a first pump light output unit 1000 and a second pump light output unit 2000.

The first pump light output unit 1000 includes a light source module 100, a first collimating mirror 200, and a first reflecting mirror 300, which are correspondingly disposed by 4 stepped heat sinks on one side of the centerline 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, which are correspondingly disposed by 4 stepped heat sinks on the other side of the centerline of the base 1. That is, each pump light output unit correspondingly includes a light source module 100 disposed on 4 adjacent first heat sinks 12, and a first collimating mirror 200 and a first reflecting mirror 300 disposed on 4 adjacent second heat sinks 13. The number of the polarization beam combiners 400 is 2, each polarization beam combiner 400 corresponds to one pump light output unit, and combines the pump light output by the corresponding light source module 100 to form combined pump light.

The polarization beam combiner 400 further includes a half-wave plate 405, the half-wave plate 405 is disposed on the first light incident surface 401, and specifically, the half-wave plate 405 is attached to the first light incident surface 401.

The polarization beam combiner 400 is disposed in front of two stepped heat sinks near the midline a of the base 1, and pump light emitted by the light source module 100 disposed on the high-step heat sink near the side wall of the base 1 of the first pump light output unit 1000 is reflected to the second reflecting mirror 500 corresponding to the high-step heat sink after being collimated by the corresponding first collimating mirror 200 and reflected by the first reflecting mirror 300, and then reflected to the first light incident surface 401 of the polarization beam combiner 400 by the second reflecting mirror 500. Similarly, the pump light emitted by the light source module 100 disposed on the low-step heat sink corresponding to the high-step heat sink is collimated by the corresponding first collimating mirror 200 and reflected by the first reflecting mirror 300, and then is reflected to the second reflecting mirror 500 corresponding to the high-step heat sink, and then is reflected to the first light incident surface 401 of the polarization beam combiner 400 by the second reflecting mirror 500. Here, since the lowest high step of the high step heat sink is one step height higher than the highest low step of the low step heat sink, the light of the second reflector 500 corresponding to the high step heat sink can directly cross the top of the second reflector 500 corresponding to the low step heat sink, thereby avoiding the light from being blocked or interfered.

The pump light emitted by the light source module 100 disposed on the high-order stepped heat sink close to the centerline a of the base 1 of the first pump light output unit 1000 passes through the collimation of the corresponding first collimating mirror 200 and the reflection of the first reflecting mirror 300, and then directly crosses the top of the corresponding second reflecting mirror 500 to be reflected to the second light incident surface 402 of the polarization beam combiner 400. Similarly, the pump light emitted by the light source module 100 disposed on the low-step heat sink corresponding to the high-step heat sink is collimated by the corresponding first collimating mirror 200 and reflected by the first reflecting mirror 300, and then reflected to the second reflecting mirror 500 corresponding to the high-step heat sink, and then reflected to the second light incident surface 402 of the polarization beam combiner 400 by the second reflecting mirror 500 corresponding to the low-step heat sink.

Since the half-wave plate 405 is disposed on the first light incident surface 401, the pump light incident from the first light incident surface 401 first enters the half-wave plate 405 before entering the first light incident surface 401, so that both the P light and the S light in the incident pump light are rotated by 90 °, the S light rotated by 90 ° is converted into the P light, and the P light passes through the polarization splitting surface 404 of the polarization beam combiner 400 and enters the extinction pore channel (not shown) to be eliminated by the extinction pore channel, and the P light converted into the S light after being rotated by 90 ° is reflected by the polarization splitting surface 404 of the polarization beam combiner 400 and is emitted from the light emitting surface 403 to the half-wave plate 405. P light of the pump light incident from the second light incident surface 402 is transmitted through the polarization splitting surface 404, emitted from the light emitting surface 403 to the half-wave plate 405, and s light is reflected to and eliminated by the extinction channels (not shown). The light source module 100 implementing the 4 first heat sinks 12 of the first pump light output unit 1000 emits pump light which is combined 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 arranged in a mirror image manner, after the pump light emitted by the light source modules 100 of the 4 first heat sinks 12 of the second pump light output unit 2000 is combined by the other polarization beam combiner 400, the transmission direction of the pump light is perpendicular to the transmission direction of the pump light after the light source modules 100 of the first pump light output unit 1000 are combined. Therefore, it is necessary to further provide a third reflecting mirror 700 in the light emitting direction of the pump light combined by the light source modules 100 of the second pump light output unit 2000, so that the pump light combined by the light source modules 100 of the second pump light output unit 2000 is rotated by 90 ° and then emitted to the focusing lens 600.

In principle, in order to further improve the output power of the pump source, the first pump light output unit 1000 and the second pump light output unit 2000 may be infinitely expanded on one side or both sides of the centerline a of the base 1, and it is only necessary to ensure that the first pump light output unit 1000 or the second pump light output unit 2000 are located on the same side of the centerline a of the base 1 and are symmetrically disposed along the centerline a.

To this end, the pump light emitted from all the light source modules 100 disposed on the 8 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 beam combiner 400 and then emitted onto the focusing lens 600. In some embodiments, the pump source may include only one integrated focusing lens 600, and the fast axis and the slow axis of the pump light emitted from the polarization beam combiner 400 are focused at the same time. In order to obtain a better light speed quality of the pump light finally output by the pump source, it is preferable that 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, and can be used as a light source of a fiber laser.

Preferably, the mode-stripping fiber 800 may be disposed in front of the light-emitting direction of the focusing lens 600, the pump light is focused by the fast axis and the slow axis of the focusing lens 600 and then coupled into the mode-stripping fiber 800, the mode-stripping fiber 800 strips unwanted impurity light in the coupled pump light, and then coupled into the transmission fiber 60, and finally the pump light is output from the transmission fiber 60 and may be used as a light source of a fiber laser.

As shown in fig. 4, a light-receiving cavity 801 recessed downward is provided on the mounting groove 10, the mold stripping optical fiber 800 is mounted in the light-receiving cavity 801, and a gold-plated cover plate 802 is detachably mounted on an opening of the light-receiving cavity 801 to seal the opening of the light-receiving cavity 801. The stray light leaking from the inside of the mode-stripping optical fiber 800 is collected in the light receiving cavity 801 and absorbed in the light receiving cavity 801. Therefore, the impurity light generated during stripping the mould of the mould stripping optical fiber 800 can be prevented from leaking into the mounting groove 10 at will to influence the combined beam output of the pump light.

The two opposite ends of the light-collecting cavity 801 are respectively provided with a first fixing groove 803 and a second fixing groove 804, and the two ends of the mode-stripping optical fiber 800 are respectively and correspondingly fixed in the first fixing groove 803 and the second fixing groove 804, so that the mode-stripping optical fiber 800 is reliably fixed.

The first connecting table 805 may be further disposed on two corresponding sides of the first fixing groove 803, the second connecting table 806 may be disposed on two corresponding sides of the second fixing groove 804, a first fixing plate 807 and a second fixing plate 808 are further disposed in the light receiving cavity 801, the first fixing plate 807 may be fastened to the first connecting table 805 by screws, and form a fixing cavity with the first fixing groove 803, so as to fix the end of the mode-stripping optical fiber 800. Similarly, the second fixing plate 808 may be fastened to the second connecting block 806 by screws, and forms a fixing cavity with the second fixing groove 804, so as to fix the end of the mode-stripping optical fiber 800.

The side wall of the light receiving cavity 801 is further provided with a heat dissipation structure for absorbing heat generated in the light receiving cavity 801, the heat dissipation structure comprises a plurality of heat dissipation plates or heat dissipation fins arranged at intervals along the side wall of the light receiving cavity, or the heat dissipation structure comprises heat conduction columns or heat conduction needles distributed in an array. The heat dissipation structures in the structural forms can increase the heat dissipation area and can quickly conduct the heat generated by the light receiving cavity.

Because the light receiving cavity 801 is directly arranged in the mounting groove of the base 10, and the mode stripping optical fiber 800 is directly arranged in the light receiving cavity 801, the mode stripping of the pump light in the base 1 of the pump source is directly realized through the mode stripping optical fiber 800 after the pump light is directly focused by the fast axis and the slow axis of the focusing lens 600, compared with the mode stripper which is independently arranged, the integration level and the structural compactness of the pump source of the laser are improved, the weight of the pump source is reduced, and the light-weighted design of the pump source is realized. And the pumping light is directly coupled and input into the mode-stripping optical fiber 800 through the focusing lens 600, compared with the transmission optical fiber coupling, the welding process of the transmission optical fiber and the mode-stripping optical fiber 800 and the transmission optical fiber used in the welding process are omitted, and the connection process of the mode-stripping optical fiber 800 and the pumping source is simplified.

As shown in fig. 3, in order to make the structure of the base 1 more compact and reasonably utilize the space of the mounting groove 10 of the base 1, a fourth reflector 900 may be further disposed behind the focusing lens 600 toward the focusing lens 600, and after the pump light emitted from the light-emitting surface of the polarization beam combiner 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 coupled into the transmission fiber 60 from the mode-stripping fiber 800, and finally the pump light is output from the transmission fiber 60 and can be used as a light source of a fiber laser. Therefore, the fast axis focusing lens 610, the slow axis focusing lens 620 and the mode stripping optical fiber 800 can be arranged along the side direction of the base 1, so that the internal structure of the base 1 is more compact, and the space of the installation groove 10 of the base 1 is reasonably utilized.

In addition, still can set up instruction optical module 3000 on the mounting groove, instruction optical module 3000 includes instruction light source module (not marking) and collimating lens (not marking), and collimating lens sets up in the light-emitting direction of instructing light source module. In this embodiment, the indication light source module and the collimating lens are packaged TO form a TO package structure, a mounting hole is formed in a sidewall of the base 1, and the indication light module 3000 is disposed in the mounting hole. The indicating light module 3000 emits an indicating light of red light with a wavelength band of 620-760nm, and in other embodiments, the indicating light module 3000 may also be an indicating light module of other colors.

The collimated indicating light emitted by the indicating light module 3000 can be directly input into the focusing lens 600, and after being focused by the fast axis and the slow axis of the focusing lens 600, the collimated indicating light is coupled into the mode stripping optical fiber 800 and then coupled into the transmission optical fiber 60, and finally the indicating light and the pumping light are output from the transmission optical fiber 60, and the indicating light can be used as an indicating light source of the optical fiber laser.

In order to make the structure of the base 1 more compact and reasonably utilize the space of the mounting groove 10 of the base 1, a fifth reflector 1100 may be further disposed in the light emitting direction of the indication light module 3000, and the transmission direction of the indication light is changed by the fifth reflector 1100 to reflect the indication light to the focusing lens 600. Thus, the position where the indicator light module 3000 is installed is not limited to a fixed position, and the installation position of the indicator light module 3000 can be adjusted depending on the specific design layout of the base 1.

As shown in fig. 3, in another embodiment, an indication light input end may be further disposed on the mounting groove 10, the indication light input end is used for connecting an external indication light source, a fifth reflector is disposed in front of the indication light input end, the indication light output by the external indication light source is reflected to the focusing lens 600 through the fifth reflector 1100, and is coupled into the mode stripping fiber 800 after being focused by the focusing lens 600 on the fast axis and the slow axis, and then is coupled into the transmission fiber 60, and finally the indication light and the pump light are output from the transmission fiber 60, and the indication light may be used as an indication light source of the fiber laser.

In some embodiments, a conductive rail 18 is arranged at one end, close to the light emitting area, between two adjacent stepped heat sinks, the conductive rail 18 may be a conductive copper sheet or a conductive aluminum sheet, the conductive rail 18 electrically connects the two adjacent stepped heat sinks, and one end, close to the side wall of the base 1, of each stepped heat sink is connected with an electrical pin 19 for connecting a power supply end, so that a series circuit is formed by the combination of the two stepped heat sinks, the conductive rail 18 and the two electrical pins 19 and the power supply end, so that the power supply end supplies power to the light source modules 100 on the two stepped heat sinks, and the segmented power supply of the multiple stepped heat sinks of the pumping source is realized. The light source module 100 can be prevented from being burnt due to overlarge current of the serial loop caused by the overlarge number of the light source modules 100 arranged on the stepped heat sink, and the influence on the heat dissipation of the base 1 of the pumping source due to the overhigh heat productivity of the stepped heat sink and the conductive rail 18 caused by the overlarge power supply current can be avoided.

The cover plate 2 is detachably covered on the first surface of the base 1 to seal the opening of the mounting groove 10, and the cover plate 2 is locked on the base 1 through screws to encapsulate the light source module 100, the optical lens, the optical fiber 800, and the like.

The base 1 is further provided with a bottom plate 3, a heat dissipation area is arranged on the second surface of the base 1, a first cooling cavity 20 which is integrally sunken is arranged at a position of the heat dissipation area opposite to the heat sink area 101, the first cooling cavity 20 is arranged opposite to the heat sink area 101, a first partition plate 11 which extends outwards from the bottom is arranged in the first cooling cavity 20, and the first cooling cavity 20 is continuously divided into cooling grooves for guiding cooling media to flow by the first partition plate 11.

As shown in fig. 5, the bottom plate 3 covers the second surface, and is hermetically connected to the extending side wall of the first cooling cavity 20 and the extending end of the first partition 11 by soldering, so that the bottom plate 3 and the cooling groove enclose to form a heat dissipation channel, a cooling medium inlet 30 and a cooling medium outlet 40 are arranged on the side wall of the base 1, one end of the heat dissipation channel is communicated with the cooling medium inlet 30, and the other end of the heat dissipation channel is communicated with the cooling medium outlet 40.

Because the light source module 100, the first collimating mirror 200, the first reflecting mirror 300 and other optical lenses are all installed and fixed in the heat sink region 101, and the position of the heat dissipation channel is opposite to the position of the heat sink region 101, heat generated by the light source module 100 and the optical lenses can be directly transferred to the heat dissipation channel opposite to the position of the heat sink region 101 through the material of the base 1 located in the heat sink region 101, and fully contacted with the cooling medium (such as cooling water, refrigerant, cooling gas and the like) in the heat dissipation channel, so that the heat can be quickly taken away by the flowing cooling medium. Because 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 region 101 through the material of the base 1 in the heat sink region 101, the heat transfer distance is shorter, the thermal resistance is smaller, and the response speed is faster, so that the heat dissipation efficiency is improved.

Moreover, because the heat dissipation channel is directly arranged on the base 1, the base of the pump source has a cooling function, more light source modules 100 can be packaged in the base of the pump source with a smaller volume, the heat dissipation requirement of the light source modules 100 can be met, the cooling structure layout of the laser pump source is simplified, the structure of the laser pump source is more compact, the volume of the laser pump source is reduced, and the research, development and manufacturing cost of the laser pump source is reduced.

As shown in fig. 5, the cooling grooves include at least one first cooling groove 201 corresponding to each first heat sink 12 and extending in a length direction of the first heat sink 12 and at least one second cooling groove 202 corresponding to each second heat sink 13 and extending in a 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 transversely connected through a first connecting groove 203, and the ends of the second cooling grooves 202 corresponding to the adjacent second heat sinks 13 are transversely connected through a second connecting groove 204, so that the first cooling grooves 201, the first connecting groove 203, the second cooling grooves 202 and the second connecting groove 204 and the bottom plate 3 enclose to form a continuous heat dissipation channel.

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

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 that of the first heat sink 12, the cooling medium in the first cooling groove 201 can flow through the area where the first heat sink 12 is located as much as possible, and the cooling medium in the first cooling groove 201 can be in full contact with the area where the first heat sink 12 is located, so that the cooling efficiency is improved.

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 that of the second heat sink 13, the cooling medium in the second cooling groove 202 can flow through the area where the second heat sink 13 is located as much as possible, and the cooling medium in the second cooling groove 202 can be in full contact with the area where the second heat sink 13 is located, so as to improve the cooling efficiency.

As shown in fig. 3, preferably, when the number of the first heat sinks 12 and the second heat sinks 13 is set to be plural, the first heat sinks 12 are arranged side by side with the second heat sinks 13, and accordingly, when the number of the first cooling grooves 201 corresponding to each of the first heat sinks 12 is set to be plural, the plural first cooling grooves 201 are arranged side by side along the width direction of the first heat sinks 12; likewise, when the second cooling groove 202 corresponding to each second heat sink 13 is provided in plurality, the plurality of second cooling grooves 202 are provided side by side in the width direction of the second heat sink 13.

As shown in fig. 2, the width and the depth of the first cooling groove 201 are both greater than the width and the depth of the second cooling groove 202, so that the cross-sectional area of the first cooling groove 201 is greater than the cross-sectional area of the second cooling groove 202, and thus 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 to take away the heat transferred from the light source module 100 to the first cooling groove 201 through the first heat sink 12, so as to meet the normal heat dissipation requirement of the light source module 100.

For example, the interval between the two first partition plates 11 constituting the first cooling groove 201 is larger than the interval between the two first partition plates 11 constituting the second cooling groove 202; the height of the two first partitions 11 constituting the first cooling tank 201 is greater than the height of the two first partitions 11 constituting the second cooling tank 202.

The heat conducting structure 14 extending from the bottom to the outside may be further disposed in the first cooling groove 201 at a position facing the light source module 100, and the heat conducting structure 14 facilitates rapid heat transfer generated on the first heat sink 12, and at the same time, may increase a heat dissipation area, so that the cooling medium can fully absorb the heat transferred by the first heat sink 12, and the cooling efficiency of the cooling medium in the first cooling groove 201 is improved.

For example, the heat conducting structure 14 may be an integral heat conducting plate extending outwardly from the bottom of the first cooling tank 201; or heat conducting columns or heat conducting needles which extend outwards from the bottom of the first cooling tank 201 and are distributed in an array; or the heat conducting fins are extended outwards from the bottom of the first cooling groove 201 and distributed at intervals. The heat conducting structures with these structural forms can increase the heat dissipation area, and can quickly conduct the heat generated by the light source module 100, so that the cooling medium can fully absorb the heat transferred by the first heat sink 12, and the cooling efficiency of the cooling medium in the first cooling groove 201 is improved.

Preferably, a plurality of gaps 110 are arranged on the first partition plate 11 at intervals, so that when the base 1 is integrally formed by adopting a forging process, reinforcing ribs can be conveniently arranged on a forging die, the structural strength of the forging die is improved, and the service life of the forging die is prolonged. In order to avoid the effect of the notch 110 on the first partition 11 on 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 heat generated at the interval between two adjacent light source modules 100 is less, the influence on the heat dissipation of the light source module 100 is minimal overall, and the notch 110 is set at these positions, which can avoid the weakening effect of the notch 110 on the cooling and heat dissipation as much as possible.

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, the distance that the heat generated by the light source module 100 is transferred from each first heat sink unit to the first cooling groove 201 can be ensured to be consistent, and each light source module 100 can be uniformly cooled. Similarly, the vertical distance from each second heat sink unit to the bottom of the second cooling groove 202 is equal, so that the vertical distance from the optical lens disposed on the second heat sink unit to the bottom of the second cooling groove 202 is equal, and the distance that the heat is transferred from each second heat sink unit to the second cooling groove 202 is kept consistent, so that each optical lens can be uniformly cooled.

In theory, the smaller the vertical distance from the light source module 100 of the first heat sink unit to the bottom of the first cooling groove 201 is, and the smaller the vertical distance from the optical lens of the second heat sink unit to the bottom of the second cooling groove 202 is, the more favorable the heat dissipation of the optical lens such as the light source module 100, the first collimating mirror 200, and the first reflecting mirror 300 is. However, the distance is smaller due to the process influence of the base 1 and the bottom plate 3 which are packaged by brazing, the base 1 is more easily deformed when being heated, and in order to ensure that the heat dissipation efficiency is improved as much as possible on the premise that the base 1 does not deform, the vertical distance from the light source module 100 of the first heat sink unit to the bottom of the first cooling groove 201 and the vertical distance from the optical lens of the second heat sink unit to the bottom of the second cooling groove 202 are both not less than 5mm.

As shown in fig. 5, a flow dividing device is further disposed in the first cooling cavity 20 near the cooling medium inlet 30, the flow dividing device includes a flow dividing chamber 150 communicated with the cooling medium inlet 30, the first cooling tank 201 and the second cooling tank 202, and a flow dividing plate 15 disposed in the flow dividing chamber 150, and the flow dividing plate 15 divides the flow dividing chamber 150 into a first flow dividing groove (not shown) communicated with the first cooling tank 201 and a second flow dividing groove (not shown) communicated with the second cooling tank 202.

The flow dividing device helps to better distribute the cooling medium flowing from the cooling medium inlet 30 to the first cooling tank 201 and the second cooling tank 202 through the first flow dividing groove and the second flow dividing groove, so that the cooling medium can be more reasonably distributed and flow in the first cooling tank 201 and the second cooling tank 202 according to the cooling and heat dissipation requirements.

Referring to fig. 3 and 5, a second cooling cavity 50 that is recessed integrally is disposed on a heat dissipation region of the second surface of the base 1 at a position opposite to the light exit region 102, a second partition 16 extending outward from the bottom is disposed in the second cooling cavity 50, the second partition 16 continuously partitions the second cooling cavity 50 into a third cooling groove 501 guiding a cooling medium to flow, a partition wall 17 is disposed between the first cooling cavity 20 and the second cooling cavity 50 to partition the first cooling cavity 20 from the second cooling cavity 50, only the first cooling groove 201 and the second cooling groove 202 are communicated with the third cooling groove 501, and the third cooling groove 501 is communicated with the cooling medium outlet 40.

The heat generated by the optical lens on the light emergent area 102 and the mode stripping fiber 800 is transferred to the third cooling groove 501, and is absorbed by the cooling medium flowing in the third cooling groove 501, so that the optical lens on the light emergent area 102 and the mode stripping fiber 800 are cooled and radiated.

In other embodiments, the heat dissipation channel may be formed by integrally forging and forming a cavity with an inward recess on the second surface of the base 1, and disposing at least one metal tube (not shown), such as a copper tube or an aluminum tube, in the cavity, so that the metal tube forms the heat dissipation channel. Or a metal tube is directly welded on the second surface of the base 1 through a brazing process.

The metal tube may be bent to any shape, for example, the metal tube may be bent to the shape of the first, second and third cooling grooves as mentioned in the above embodiments, and the area where the metal tube is disposed is ensured to correspond to the positions of the stepped heat sink, the optical lens and the stripped optical fiber. The heat dissipation effect of the metal pipe is as close as possible to that of the cooling groove in the above embodiment.

In order to improve the heat conductivity of the base 1 and the bottom plate 3 and the adhesion of the surface of the base 1 to the plating layer, the base 1 and the bottom plate 3 may be made of brass or aluminum material with good heat conductivity.

The outer surface of the base 1 is provided with a gold plating layer, a silver plating layer, a tin plating layer or a nickel plating layer. The gold-plated layer, the silver-plated layer, the tin-plated layer or the nickel-plated layer have excellent electrical conductivity and thermal conductivity, and have good formability for a light source emitted by the light source module, so that the light source does not scatter light. Particularly, the surface of the stepped heat sink for encapsulating the light source module 100 is provided with a silver coating, and the silver coating can strengthen adhesion and circulation when being welded to the light source module 100, so that the light source module 100 and the silver coating are completely attached without welding holes. In addition, compared with a gold plating layer, the silver plating layer, the tin plating layer or the nickel plating layer has lower cost, so that the cost of the laser pumping source has more competitive advantage.

As shown in fig. 6 and 7, in order to further improve the overall heat dissipation capability of the laser pumping source and optimize the heat dissipation environment of the laser pumping source, a cooling channel 21 is further disposed on the cover plate 2 for introducing a cooling medium to cool the cover plate 2. In this way, the light source module 100 and the optical lens disposed in the heat sink region 101 of the mounting groove 10, the indication light module 3000 disposed in the light emitting region 102, and the optical fiber 800 for stripping in the light receiving cavity 801 can perform heat dissipation and cooling through the heat dissipation channel disposed on the base 1, and can perform heat dissipation and cooling through the cooling channel 21 disposed on the cover plate 2, so as to further improve the heat dissipation efficiency of the laser pumping source.

In addition, other heat generating components of the laser pumping source may be disposed on the outer surface of the cover plate 2, for example, the active optical fiber may be directly wound on the outer surface of the cover plate 2, and the active optical fiber may be cooled by heat dissipation through the cooling channel 21 disposed on the cover plate 2. Specifically, the optical fiber reel may be directly fixed on the outer surface of the cover plate 2, or the optical fiber grooves for winding the active optical fibers may 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 cover plate, and the cooling channels 21 are directly machined into the cover plate 2, for example, by drilling to directly machine the through-type cooling channels 21. The side wall of the cover plate 2 is provided with a cooling source inlet 23 and a cooling source outlet 24 which are communicated with the cooling channel 21.

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 a surface of the first cover plate 21, which is attached to the second cover plate, is provided with an integral recessed area, a plurality of spaced flanges 212 extend from a bottom of the recessed area, and the recessed area is continuously divided into grooves 211 for guiding a cooling medium to flow by the plurality of spaced flanges 212. The second cover plate 22 is connected with the first cover plate 21 in a sealing manner through brazing, the opening of the concave area is sealed, and the groove 211 and the second cover plate 21 are matched in a sealing manner to form a cooling channel. The side wall of the cover plate 2 is provided with a cooling source inlet 23 and a cooling source outlet 24 which are communicated with the cooling channel.

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

The packaging process of the laser pumping source comprises the following steps:

s1, providing a base blank, and directly processing a base with a first surface and a second surface on the base blank to obtain a semi-finished product of the base.

The method comprises the steps of processing a plurality of first clapboards which extend outwards from the bottom and keep consistent with the length direction of the stepped heat sink in a heat dissipation area, and arranging the first clapboards at intervals along the width direction of the stepped heat sink to continuously separate the cooling grooves from the first clapboards in the heat dissipation area.

Processing a first heat sink in a long strip shape for installing the light source module and a second heat sink in a long strip shape for installing the optical lens on each stepped heat sink, and enabling the first heat sink and the second heat sink to be arranged side by side.

Specifically, a forging process is adopted, and the base with the first surface and the second surface is integrally formed by forging and pressing the blank through a forging and pressing die.

The light-receiving cavity comprises a mounting groove which is formed on the first surface of the base in an integrated mode and is sunken downwards, a plurality of step heat sinks arranged in the mounting groove and a light-receiving cavity used for stripping.

And a heat dissipation area which is sunken downwards is integrally formed on the second surface of the base, and the heat dissipation area comprises a first cooling cavity, a second cooling cavity, a cooling groove arranged in the heat dissipation area and a first cooling groove, a second cooling groove and a third cooling groove.

The forging and pressing process has the advantages of high production efficiency, simple process, capability of saving a large number of machining processes and machining equipment, raw material saving and the like, can reduce the manufacturing cost of the pump source, is suitable for mass production, and improves the production efficiency of the pump source.

In addition, the base with the first surface and the second surface can also be directly processed on the base blank by adopting a machining mode, such as milling and the like.

Comprises a mounting groove which is recessed downwards and is milled on the first surface of a base, a plurality of step heat sinks which are arranged in the mounting groove and a light receiving cavity which is used for stripping.

And milling a heat dissipation area which is concave downwards on the second surface of the base, wherein the heat dissipation area comprises a first cooling cavity, a second cooling cavity, and a cooling groove which is arranged in the heat dissipation area and comprises a first cooling groove, a second cooling groove and a third cooling groove.

And S2, carrying out CNC finish machining on the semi-finished product of the base manufactured in the step S1, and machining 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 through CNC.

And S3, hermetically connecting the base plate with the second surface of the base by adopting a brazing process, welding the base and the base plate to form an integrated pump source base, integrally packaging the heat dissipation area, and enclosing the base plate, the first cooling groove, the second cooling groove and the third cooling groove to form a heat dissipation channel.

Specifically, a layer of liquid solder is coated on the extension end face of the heat dissipation area of the base and the end face of the extension end of the first partition plate forming the cooling tank, or a proper amount of solder pieces are placed on the extension end face of the heat dissipation area of the base and the end face of the extension end of the first partition plate forming the cooling tank. Next, the base plate is covered on the base, the liquid solder or solder sheet is covered, and placed in a shaping mold. And heating the shaping mold, controlling the heating temperature, and melting the liquid solder or the solder sheet to weld the base and the bottom plate to form the pumping source base of an integrated structure.

S4, welding to form the outer surface of the pumping source base in the step S3, and carrying out electrochemical surface treatment to form an electroplated layer on the outer surface of the pumping source base;

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

The silver electroplating process comprises the following steps:

s401, performing first oil removal cleaning on a pumping source base, performing sand blasting after drying, performing second oil removal cleaning, and performing standby after drying, wherein the first oil removal cleaning and the second oil removal cleaning are performed in an ultrasonic cleaning machine, the frequency is set to be 40-60 Hz, the temperature is controlled to be 50-60 ℃, and the method is a preposed step in an electrosilvering stage;

s402, the following process flows are executed on the pumping source base to complete the silver plating process: acid washing → cleaning → copper plating → cleaning → activation → cleaning → nickel plating → cleaning → activation → cleaning → pre-silver plating → cleaning → silver protectant → cleaning → dehydration → drying; the concrete requirements are as follows:

acid washing: acid washing with dilute hydrochloric acid: hydrochloric acid concentration: 5 to 10 percent;

cleaning: cleaning the water in a water tank by using clean circulating water;

copper plating: plating copper on the surface of the base material, wherein the parameters of a copper plating liquid tank are as follows: concentration of copper oxide: 20-40 g/L, sodium oxide concentration: 10-15 g/L, controlling the temperature to be 55-65 ℃ and the time to be 5min;

and (3) activation: activation with dilute hydrochloric acid: hydrochloric acid concentration: 5-10%, activation time: 5-10 s;

nickel plating: plating nickel on the surface of the base material, wherein the parameters of the nickel plating liquid tank are as follows: nickel sulfate content: 200-300 g/L, nickel chloride content: 40-60 g/L, boric acid content: 40-60 g/L; coating thickness: nickel 3-5 μm; carrying out a Ha-type test;

pre-silver plating: the parameters of the silver plating liquid tank are as follows: content of metallic silver: 1-3 g/L, potassium chloride content: 90-120 g/L;

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

coating a silver protective agent: coating a silver protective agent on the surface of the silver coating;

and S403, testing reliability to obtain a finished product. Wherein, the reliability test comprises the following items: coating thickness, gummed paper stripping, grid test, dyne test, ultrasonic cleaning, high-temperature baking and neutral salt spray. The specific requirements are as follows:

coating thickness: detecting by using an X-ray fluorescence instrument, wherein the nickel is 3-5 mu m, and the silver is 3-6 mu m;

stripping adhesive tape: pressing and leveling the 3M 600 gummed paper at 180 degrees, and peeling for three times;

and (3) carrying out a grid test: cutting 1 × 1mm small grids by a hundred-grid knife, vertically pressing 3M gummed paper for three times, and enabling the falling area to be less than 10%;

testing a dyne pen: drawing 100mm long ink bars, and observing whether more than 90% of the ink bars shrink within 2 seconds to form ink drops;

ultrasonic cleaning: deionized water is ultrasonically cleaned for 15 minutes, and no liquid residue is left in the threaded hole;

and (3) high-temperature baking: baking at the high temperature of 240 ℃ for 30Min, and naturally cooling in the oven to determine whether the peeling bulge exists;

neutral salt spray: neutral salt spray for 24h, and whether the surface has bubbles, blackness, yellowing and spots;

s5, packaging the light source module and the optical lens, welding and fixing the light source module on the packaging plane which is processed through CNC (computerized numerical control) in the step S2, positioning the optical lens through an optical lens positioning device, and bonding and fixing the optical lens on a second heat sink unit of the stepped heat sink through heat-conducting glue.

S6, packaging the stripped optical fiber, namely installing and fixing the stripped optical fiber in a light receiving cavity, locking a gold-plated cover plate on the light receiving cavity, and sealing an opening of the light receiving cavity to finish packaging the stripped optical fiber.

S7, cover plate packaging, namely, fixedly connecting the cover plate to the first surface of the base through screws, and sealing the opening of the mounting groove of the base so as to integrally package the light source module and the optical lens in the mounting groove.

Specifically, the epitaxial terminal surface interval in the mounting groove of base sets up the round screw hole, passes the apron through the screw and is connected with the screw hole cooperation, will lap fastening connection on the base.

In summary, the following steps: the utility model discloses the pumping source of implementation owing to directly set up heat dissipation channel on base 1, makes the base of pumping source from taking cooling function to through set up a plurality of ladder heat sinks that are used for encapsulating light source module 100 and optical lens on base 1, can realize concentrating more light source module 100 and encapsulate in base 1 of the pumping source that the volume is littleer, realize the encapsulation of the high integration level of light source module 100, and the high power output of pumping source. Meanwhile, the heat dissipation requirement of the light source module 100 can be met, and the cooling structure layout of the laser pumping source is simplified.

And the stepped heat sink, the light receiving cavity for stripping the die and the cooling groove for guiding the flow of the cooling medium are directly processed on the base 1 in forging or milling modes, so that the structure of the laser pumping source is more compact, the volume of the laser pumping source is reduced, the weight of the laser pumping source is reduced, the light-weight design of the pumping source is realized, and the research and development and manufacturing cost of the laser pumping source are reduced.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; within the idea of the invention, also technical features in the above embodiments or in different embodiments can be combined, steps can be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims (10)

1. A high-power laser pumping source is characterized by comprising a plurality of light source modules, first collimating lenses and first reflectors, polarization beam combiners, focusing lenses and mode stripping optical fibers, wherein the number of the first collimating lenses and the first reflectors is the same as that of the light source modules; wherein,

the first collimating lens, the first reflector, the polarization beam combiner and the focusing lens are sequentially arranged in the light-emitting 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.

2. The high power laser pumping source of claim 1, wherein the plurality of light source modules are distributed in an array, the light source modules in each row are staggered from high to low, and each light source module is correspondingly provided with a first collimating mirror and a first reflecting mirror; the pumping source also comprises second reflectors which have the same number as the rows of the light source modules and are arranged facing the first reflectors;

the polarization beam combiner comprises a first light incident surface and a second light incident surface, and pump light emitted by at least one row of light source modules is reflected to the second reflector through the first reflector and is reflected to the first light incident surface through the second reflector; the pumping light emitted by at least one row of the rest light source modules is reflected to the second reflecting mirror through the first reflecting mirror and is reflected to the second light incident surface through the second reflecting mirror.

3. The high power laser pumping source of claim 2, wherein the pumping source is provided with 8 stepped heat sinks, each stepped heat sink comprises an elongated shape and is provided with a first heat sink and a second heat sink side by side, the light source modules are arranged on the first heat sink at intervals to form an array distribution, and the first collimating mirror and the first reflecting mirror are correspondingly arranged on the second heat sink; the number of the polarization beam combiners is 2, and every 4 adjacent stepped heat sinks are correspondingly provided with one polarization beam combiner, wherein the pump light emitted by the light source modules on the two adjacent first heat sinks is reflected to enter the first light inlet surface, and the pump light emitted by the light source modules on the remaining two first heat sinks is reflected to enter the second light inlet surface.

4. The high power laser pump source in claim 3, wherein the polarization beam combiner further includes a light emitting surface, the pump source further includes a third reflector, and the third reflector is disposed facing the light emitting surface of one of the polarization beam combiners; the pump light emitted from the light emitting surface of one polarization beam combiner directly enters the focusing lens, and the pump light emitted from the light emitting surface of the other polarization beam combiner enters the focusing lens after being reflected by the third reflector.

5. The high power laser pumping source as claimed in claim 4, wherein a fourth mirror is disposed behind the focusing lens and facing the focusing lens, and the pump light emitted from the light emitting surface of the polarization beam combiner and the pump light reflected from the third mirror are both reflected by the fourth mirror and then enter the focusing lens.

6. The high power laser pumping source of claim 1, wherein the pumping source has a light receiving cavity therein, the mode stripping fiber is disposed in the light receiving cavity, and a gold-plated cover plate is detachably mounted on an opening of the light receiving cavity.

7. The high power laser pump source of claim 1, wherein the focusing lens is an integrated structure to simultaneously focus the pump light emitted from the polarization beam combiner on the fast axis and the slow axis;

or the focusing lens comprises a fast axis focusing lens and a slow axis focusing lens which are arranged in sequence, and the pump light emitted from the polarization beam combiner passes through the fast axis focusing lens and the slow axis focusing lens in sequence to carry out fast axis focusing and slow axis focusing respectively.

8. The high power laser pump source of claim 1, further comprising an indication light module, wherein the indication light module comprises an indication light source module and a collimating lens, and the collimating lens is disposed in a light emitting direction of the indication light source module; and the indicating light emitted by the indicating light source module is collimated by the collimating lens, then enters the focusing lens for focusing, and is output after being stripped by the stripping optical fiber.

9. The high power laser pumping source according to claim 1, further comprising an indication light input end, wherein the indication light input end is used for connecting an external indication light source, and indication light emitted by the indication light source is reflected by a fifth reflector to enter the focusing lens for focusing, and then output after being stripped by the mode stripping optical fiber.

10. A fibre laser comprising a high power laser pump source as claimed in any one of claims 1 to 9.

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