CN216850732U - All-fiber laser - Google Patents

Abstract

The utility model discloses an all-fiber laser, include: the pumping module, resonance module and output module, the pumping module includes two at least pumping units, be provided with first gain optic fibre between the adjacent pumping unit, resonance module is connected with pumping module's input, resonance module is including the high anti-grating that connects gradually, second gain optic fibre and low anti-grating, low anti-grating is connected with pumping module's input, output module is connected with pumping module's output, first gain optic fibre and the crooked setting of second gain optic fibre, the scope of the radius of first gain optic fibre and second gain optic fibre is 10-20cm, through to the specific bending radius of first gain optic fibre and second gain optic fibre, realize reverse return light increase divergence angle, realize that reverse light strips step by step.

Description

All-fiber laser

Technical Field

The utility model relates to a fiber laser technical field, in particular to all fiber laser.

Background

At present, a continuous 2KW optical fiber laser realizes high-reflection stripping at output QBH, and a high-reflection material is cut for a long time, so that a quartz end face can inevitably form a burning point, and the laser is burnt; or the high reflection resistance of the device is improved, but the device is damaged after long-term use, and the high-power (more than 1500W) return light is not really stripped in the optical path.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to solve one of the technical problem that exists among the prior art at least, provide a full fiber laser.

According to an embodiment of the first aspect of the present invention, there is provided an all-fiber laser, including: the pumping module comprises at least two pumping units, the pumping units are adjacent to each other, a first gain optical fiber is arranged between the pumping units, the resonance module is connected with the input end of the pumping module, the resonance module comprises a high-reflection grating, a second gain optical fiber and a low-reflection grating which are sequentially connected, the low-reflection grating is connected with the input end of the pumping module, the output module is connected with the output end of the pumping module, the first gain optical fiber and the second gain optical fiber are arranged in a bending mode, and the radius range of the first gain optical fiber and the radius range of the second gain optical fiber are 10-20 cm.

Has the advantages that: the all-fiber laser comprises: the pumping module, resonance module and output module, the pumping module includes two at least pumping units, be provided with first gain optic fibre between the adjacent pumping unit, resonance module is connected with pumping module's input, resonance module is including the high anti-grating that connects gradually, second gain optic fibre and low anti-grating, low anti-grating is connected with pumping module's input, output module is connected with pumping module's output, first gain optic fibre and the crooked setting of second gain optic fibre, the scope of the radius of first gain optic fibre and second gain optic fibre is 10-20cm, through to the specific bending radius of first gain optic fibre and second gain optic fibre, realize reverse return light increase divergence angle, realize that reverse light strips step by step.

According to the utility model discloses full fiber laser, full fiber laser still includes back optical treatment module, back optical treatment module input with the high reflecting grating is connected.

According to the utility model discloses full fiber laser of first aspect embodiment, go back to light processing module and include the reverse mould ware of shelling of a plurality of series connection settings, be located the reverse mould ware of shelling of head end with high reflecting grating connects.

According to the utility model discloses full fiber laser of first aspect embodiment, go back optical processing module and still include a plurality of bent fiber, each bent fiber sets up reverse stripper input.

According to an embodiment of the first aspect of the present invention, the radius of the bent optical fiber is in the range of 10-20 cm.

According to the utility model discloses full fiber laser, go back light processing module and still glue the structure including gluing, glue the structure setting and be in reverse output of shelling the mould ware.

According to the utility model discloses full fiber laser, each the pumping unit includes N pumping source and reverse beam combiner, reverse beam combiner includes N input fiber and a signal fiber, each the tail fiber of pumping source with input fiber links to each other.

According to the utility model discloses full fiber laser of first aspect embodiment, the quantity of pumping unit is two, reverse beam combiner is 6+1 × 1 type beam combiner, the quantity of pumping source is 6.

According to the embodiment of the first aspect of the present invention, each of the pumping units further includes a first stripper, and the first stripper is connected to the signal fiber.

According to the utility model discloses full fiber laser of first aspect embodiment, output module includes second stripper and output end cap, the second stripper with the pumping module output is connected.

Drawings

The present invention will be further described with reference to the accompanying drawings and examples;

fig. 1 is a schematic view of an optical structure of an all-fiber laser according to an embodiment of the present invention.

A pumping module 100, a pumping unit 110, a first gain fiber 120;

a pump source 111, a reverse beam combiner 112, a first stripper 113;

a resonance module 200, a high reflection grating 210, a second gain fiber 220, and a low reflection grating 230;

an output module 300, a second stripper 310, an output end cap 320;

the optical fiber module comprises a light return processing module 400, a first reverse mode stripper 410, a second reverse mode stripper 420, a first bent optical fiber 430, a second bent optical fiber 440, a first glue 450 and a second glue 460.

Detailed Description

This section will describe in detail the embodiments of the present invention, preferred embodiments of the present invention are shown in the attached drawings, which are used to supplement the description of the text part of the specification with figures, so that one can intuitively and vividly understand each technical feature and the whole technical solution of the present invention, but they cannot be understood as the limitation of the protection scope of the present invention.

In the description of the present invention, it should be understood that the orientation or positional relationship indicated with respect to the orientation description, such as up, down, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, a plurality of means are one or more, a plurality of means are two or more, and the terms greater than, less than, exceeding, etc. are understood as not including the number, and the terms greater than, less than, within, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present invention, unless there is an explicit limitation, the terms such as setting, installing, connecting, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meaning of the terms in the present invention by combining the specific contents of the technical solution.

Fig. 1 is a schematic diagram of an optical path structure of an all-fiber laser, please refer to fig. 1, an all-fiber laser includes: the pump module 100, the resonance module 200 and the output module 300, the pump module 100 includes at least two pump units 110, a first gain fiber 120 is disposed between adjacent pump units 110, the resonance module 200 is connected to an input end of the pump module 100, the resonance module 200 includes a high anti-grating 210, a second gain fiber 220 and a low anti-grating 230, which are connected in sequence, the low anti-grating 230 is connected to an input end of the pump module 100, the output module 300 is connected to an output end of the pump module 100, wherein the first gain fiber 120 and the second gain fiber 230 are arranged in a bending manner, and a radius range of the first gain fiber 120 and the second gain fiber is 10-20 cm.

The all-fiber laser adopts a specific light path design, the first gain fiber 120 and the second gain fiber 220 are arranged in a bending mode, and the radius of the first gain fiber 120 and the radius of the second gain fiber 220 are set within 10-20cm, so that the divergence angle of reverse light is increased, and finally the internal high-power retroreflective stripping is realized.

In some embodiments, each pump unit 110 includes N pump sources 111 and an inverse combiner 112, where the inverse combiner 112 includes N input fibers and one signal fiber, and a pigtail of each pump source 111 is connected to the input fiber. It is easy to understand that the pump laser of the pump source 111 is coupled into the gain fiber through the inverse beam combiner 112, and the gain fiber is excited to generate the spontaneous emission amplified laser for bidirectional transmission. The inverse beam combiner 112 is configured to combine outputs of the multiple pump sources 111 into a single output beam.

The pumping source 111 can adopt semiconductor laser, and semiconductor laser adopts direct current power supply, can carry out pulse drive through laser drive modulation power, outputs corresponding pulsed light, and during resonant module 200 was injected into through first reverse beam combiner to the pulsed light, each semiconductor laser's model parameter was unanimous, and inside can set up to the single tube coupling, takes the tail fiber output.

In some of these embodiments, the inverse combiner 112 includes N input fibers and one signal fiber. The number of the pump sources 111 is equal to the number of the inverse beam combiners 112, and the number of the input fibers is matched with the number of the pump sources 111, so that one ends of the plurality of input fibers are respectively fused with the output signal fibers of the plurality of pump sources 111. The signal fiber serves as an output fiber.

Specifically, the reverse beam combiner 112 may be a 6+1 × 1 type beam combiner, and the input fiber parameters of the reverse beam combiner are consistent with the parameters of the tail fiber of the semiconductor laser, and the signal fiber has the same fiber diameters as the high reflective grating 210 and the low reflective grating 230.

The high reflecting grating 210 and the low reflecting grating 230 are all optical fiber devices, and the core and numerical aperture parameters of the two devices can be selected to be consistent. The high reflectivity grating 210 has a refractive index of not less than 99.5% and the low reflectivity grating 230 has a reflectivity of about 10% at the laser wavelength.

Referring to fig. 1, in some embodiments, each pump unit 110 includes N pump sources 111, an inverse beam combiner 112, and a first stripper 113. The first mode stripper 113 is connected to the signal fiber, and the first mode stripper 113 strips the reverse return light.

Referring to fig. 1, in some embodiments, the output module 300 includes a second stripper 310 and an output end cap 320, the second stripper 310 is connected to the output end of the pumping module 100, and the second stripper 310 performs a conventional stripping process to strip the large divergence angle portion of the backward returning light in the application. The output end cap 320 is a QBH end cap, and the output end cap 320 and the second stripper 310 are welded together, so that the high-power fiber laser transmission and output are realized, the compatibility is good, the transmission loss is low, the bearing power is high, the temperature control protection can be realized, and the water-cooling or air-cooling heat dissipation function is provided.

Referring to fig. 1, in some embodiments, the all-fiber laser includes a pump module 100, a resonance module 200, an output module 300, and a return light processing module 400. Wherein, the input end of the light returning processing module 400 is connected with the high reflective grating 210. The light return processing module 400 is arranged at the input end of the light path and is used for stripping the reverse return light,

specifically, in order to strip the reverse return light, the return light processing module 400 includes a plurality of reverse strippers arranged in series, and the reverse return light is gradually stripped by adopting a graded stripping manner.

Referring to fig. 1, in some embodiments, the light returning processing module 400 includes two reverse strippers connected in series, namely a first reverse stripper 410 and a second reverse stripper 420. Two first reverse stripper 410 and second reverse stripper 420 which are arranged in series are adopted, and reverse return light is stripped on the premise of not influencing the output performance. The first reverse stripper 410 is connected with the input end of the high-light-reflecting grating 210, the types of the first reverse stripper 410 and the second reverse stripper 420 can be selected to be consistent, the first reverse stripper 410 and the second reverse stripper 420 strip reverse return light, and the bearable power reaches 800W.

Specifically, the light returning processing module 400 includes a plurality of reverse mode strippers and a plurality of bent optical fibers, each of which is disposed at an input end of the reverse mode stripper. Wherein the radius of the bent optical fiber is in the range of 10-20 cm. The divergence angle of the backward return light is increased by arranging a bent optical fiber at the input end of the backward stripper, the bent optical fiber is arranged in a small loop shape, and by arranging a specific bending radius.

Referring to fig. 1, in some embodiments, the return light processing module 400 includes two bent optical fibers, namely a first bent optical fiber 430 and a second bent optical fiber 440, and the radius of the first bent optical fiber 430 and the radius of the second bent optical fiber 440 are in a range of 10-20 cm. A first bent optical fiber 430 is disposed at the input end of the first reverse stripper 410 and a second bent optical fiber 440 is disposed at the input end of the second reverse stripper 420. The first reverse stripper 410 and the second reverse stripper 420 may be used to remove the cladding residual pump light. The first bent optical fiber 430 arranged at the input end of the first reverse mode stripper 410 and the second bent optical fiber 440 arranged at the input end of the second reverse mode stripper 410 realize that the divergence angle of the reverse light is increased, thereby realizing that the reverse light is stripped step by step.

It is understood that the radius of the first bent optical fiber 430 is 15cm, and the radius of the second bent optical fiber 440 is also set to 15cm, which is effective for enlarging the divergence angle of the backward returning light.

Certainly, the number of the reverse mode strippers can be set according to actual needs, the number of the reverse mode strippers is not limited by the scheme, the scheme is within a protection range, and the number of the bent optical fibers is equal to that of the reverse mode strippers.

In some embodiments, the light returning processing module 400 includes a plurality of reverse stripper, a plurality of bent optical fibers, and a plurality of dispensing structures, the dispensing structures are disposed at an output end of the reverse stripper, and the dispensing structures are used for verifying reverse light returning stripping of the reverse stripper. The dispensing structure is equivalent to a mold stripping device, if the reverse mold stripping device at the front end does not process reverse return light, the dispensing structure is abnormal, and the dispensing structure can improve the safety of the whole system, so that the reliability of the return light processing module 400 is improved.

Referring to fig. 1, in some embodiments, the light-returning processing module 400 includes two dispensing structures, i.e., a first dispensing 450 and a second dispensing 460, respectively, the first dispensing 450 is disposed at an output end of the first reverse stripper 410, and the second dispensing 460 is disposed at an output end of the second reverse stripper 420. The first glue 450 verifies the reverse light-back stripping of the first reverse stripper 410, and the second glue 460 verifies the reverse light-back stripping of the overall output.

Of course, it will be readily appreciated that the output of the return light processing module 400 may be provided at a chamfer angle. In this embodiment, the output end of the return light processing module 400 is 10/125 bare fiber chamfer angle, so that the reverse return light power can be tested.

Referring to fig. 1, in some embodiments, an all-fiber laser includes a pump module 100, a resonance module 200, an output module 300, and a return light processing module 400. The number of the pump units 110 is two, the inverse beam combiner 112 is a 6+1 × 1 type beam combiner, and the number of the pump sources 111 is 6. Specifically, the pumping unit 110 is divided into a first pumping unit and a second pumping unit, the reverse combiner 112 is divided into a first reverse combiner and a second reverse combiner, and the first stripper 113 includes a first stripper and a second stripper. Specifically, the first pump unit includes 6 first pump sources, each of the first pump sources may employ a pump semiconductor laser, and a pigtail of the first pump source is connected to an input fiber of the first reverse beam combiner. The second pumping unit comprises 6 second pumping sources, the second pumping sources also adopt pumping semiconductor lasers, and tail fibers of the second pumping sources are connected with input fibers of the second reverse beam combiner.

Specifically, the first pumping unit serves as a seed source, a reverse 6+1 × 1 type beam combiner is adopted, the input optical fiber and the output optical fiber are 20/400, reverse return light is normally transmitted forwards, accumulation is not carried out in the first reverse beam combiner, and the service life of the first reverse beam combiner is not influenced. The second pumping unit is used as an amplification stage, a reverse 6+1 × 1 type beam combiner is adopted, an input optical fiber is 20/400, an output signal optical fiber is 20/250, normal forward transmission of reverse light is realized, normal work of a pumping source is not influenced by the reverse light, and meanwhile, a return light processing module 400 is added at the input end of an input secondary signal to realize primary stripping of return light of the amplification stage. The first reverse beam combiner of the primary optical path of the seed source can adopt a special reverse beam combiner, the input optical fiber and the output optical fiber both adopt 20/400 optical fibers, reverse light can be transmitted towards the primary optical path to be stripped deeper, the input end of the primary optical path adopts two series reverse mode stripping devices, the bearing power of a single reverse mode stripping device reaches 800W, and the single reverse mode stripping device is not damaged after long-term operation. The second mode stripper at the input end of the amplification stage can adopt a low-depth reverse mode stripper, the divergence angle NA in stripping reverse return light is larger than 0.35, and the first-stage reverse beam combiner is protected.

The retro-reflection is obtained by connecting the laser to the input end, so that whether the light path structure meets the requirement of anti-retro-reflection is tested, and the test result is as follows:

the output power of 72h is tested under the conventional condition, the 100 percent output power exceeds 2100W, the laser power is stable, the fluctuation is less than or equal to 2 percent, the temperature of the second stripper 310 and the first stripper is less than 30 ℃, the temperature of the second stripper is 38.8 ℃, the temperature of the first reverse stripper 410 is 40.1 ℃, and the temperature of the second reverse stripper 420 is 39.2 ℃.

The connection point between the first mould stripping device and the second mould stripping device 310 is disconnected, the 1800W laser is inserted into the output end, the power is gradually increased, when the input power of the 1800W laser reaches 1500W, the optical path of the laser is not burnt, wherein the temperature of the first mould stripping device is 30 ℃, the temperature of the second mould stripping device is 65 ℃, the temperature of the first reverse mould stripping device 410 is 70 ℃, the temperature of the second reverse mould stripping device 420 is 69.2 ℃, the output power is less than 1W, and after 72h of test, the temperature is stable, and the optical path is not abnormal.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.

Claims (10)

1. An all-fiber laser comprising:

the pumping module comprises at least two pumping units, and a first gain fiber is arranged between every two adjacent pumping units;

the resonance module is connected with the input end of the pumping module and comprises a high-reflection grating, a second gain fiber and a low-reflection grating which are sequentially connected, and the low-reflection grating is connected with the input end of the pumping module;

the output module is connected with the output end of the pumping module;

the first gain fiber and the second gain fiber are arranged in a bent mode, and the radius range of the first gain fiber and the radius range of the second gain fiber is 10-20 cm.

2. The all-fiber laser according to claim 1, characterized in that: the all-fiber laser further comprises a light returning processing module, and the input end of the light returning processing module is connected with the high-reflection grating.

3. The all-fiber laser according to claim 2, characterized in that: the light return processing module comprises a plurality of reverse mold stripping devices which are connected in series, and the reverse mold stripping devices positioned at the head end are connected with the high-reflection grating.

4. The all-fiber laser according to claim 3, characterized in that: the light return processing module further comprises a plurality of bent optical fibers, and each bent optical fiber is arranged at the input end of the reverse stripper.

5. The all-fiber laser according to claim 4, characterized in that: the radius of the bent optical fiber ranges from 10 cm to 20 cm.

6. The all-fiber laser according to claim 4, characterized in that: the light return processing module further comprises a plurality of dispensing structures, and the dispensing structures are arranged at the output end of the reverse mold stripping device.

7. The all-fiber laser according to claim 1, characterized in that: each pumping unit comprises N pumping sources and a reverse beam combiner, the reverse beam combiner comprises N input optical fibers and a signal optical fiber, and a tail fiber of each pumping source is connected with the input optical fiber.

8. The all-fiber laser according to claim 7, characterized in that: the number of the pumping units is two, the reverse beam combiner is a 6+1 × 1 type beam combiner, and the number of the pumping sources is 6.

9. The all-fiber laser according to claim 7, characterized in that: each pumping unit further comprises a first mode stripper, and the first mode stripper is connected with the signal optical fiber.

10. The all-fiber laser according to claim 1, characterized in that: the output module comprises a second mould stripper and an output end cap, and the second mould stripper is connected with the output end of the pumping module.

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