CN112234416A - Bidirectional pumping fiber laser and spare input branch return light processing method - Google Patents
Bidirectional pumping fiber laser and spare input branch return light processing method Download PDFInfo
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- CN112234416A CN112234416A CN202011057405.0A CN202011057405A CN112234416A CN 112234416 A CN112234416 A CN 112234416A CN 202011057405 A CN202011057405 A CN 202011057405A CN 112234416 A CN112234416 A CN 112234416A
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- beam combiner
- fiber laser
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- input branch
- fiber
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- 239000000835 fiber Substances 0.000 title claims abstract description 76
- 230000002457 bidirectional effect Effects 0.000 title claims abstract description 27
- 238000005086 pumping Methods 0.000 title claims abstract description 21
- 238000003672 processing method Methods 0.000 title claims abstract description 6
- 238000003466 welding Methods 0.000 claims abstract description 49
- 239000013307 optical fiber Substances 0.000 claims description 19
- 238000001816 cooling Methods 0.000 claims description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- 230000004927 fusion Effects 0.000 claims description 14
- 239000003292 glue Substances 0.000 claims description 13
- 230000003287 optical effect Effects 0.000 abstract description 6
- 238000000034 method Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 239000000306 component Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000007526 fusion splicing Methods 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/02—Constructional details
- H01S3/04—Arrangements for thermal management
- H01S3/0407—Liquid cooling, e.g. by water
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/02—Constructional details
- H01S3/04—Arrangements for thermal management
- H01S3/042—Arrangements for thermal management for solid state lasers
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- Physics & Mathematics (AREA)
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- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Optics & Photonics (AREA)
- Lasers (AREA)
- Laser Beam Processing (AREA)
Abstract
The invention relates to the field of fiber lasers, in particular to a bidirectional pumping fiber laser which comprises a plurality of forward pumping sources, a forward beam combiner, a fiber grating, a gain fiber, a reverse beam combiner, a plurality of reverse pumping sources, a stripper and a fiber output head; the spare input branch of the forward beam combiner and the spare input branch of the reverse beam combiner are sequentially welded together to form a welding point, so that the spare input branch of the forward beam combiner and the spare input branch of the reverse beam combiner form a closed loop, the influence of return light of the spare input branches of the forward beam combiner and the reverse beam combiner on an optical path system is avoided, the laser in the spare input branches of the forward beam combiner and the reverse beam combiner can be promoted to circularly flow in the system, and the laser utilization rate is improved. The invention also provides a spare input branch return light processing method.
Description
Technical Field
The invention relates to the field of fiber lasers, in particular to a bidirectional pumping fiber laser and a spare input branch return light processing method.
Background
The optical fiber laser is a laser using rare earth element doped glass fiber as a gain medium, and can be developed on the basis of an optical fiber amplifier: under the action of pump light, high power density is easily formed in the optical fiber, so that the population inversion of the laser energy level of the laser working substance is caused, and when a positive feedback loop (forming a resonant cavity) is properly added, laser oscillation output can be formed. At present, a pump beam combiner has been applied to various fiber laser systems as a main means of pump coupling, and plays a role in combining pump light of multiple pump sources into one optical fiber for output. In order to improve the light-light conversion efficiency of the laser, a bidirectional pumping mode has become a conventional choice in the field. However, when a bidirectional pumping mode is adopted, a pump beam combiner often has an empty input branch, and particularly when a fiber laser is used for processing high-return metal materials, a large amount of return light can appear in the empty input branch of the pump beam combiner, and if the return light is not processed, the temperature of optical components or optical fibers in an optical path system can sharply rise, so that the risk of burnout is caused at any time. If the pump beam combiner serving as a core component of a high-power single-mode fiber laser system is damaged, the stability and reliability of the fiber laser system are greatly influenced.
Disclosure of Invention
The present invention provides a bidirectional pump fiber laser and a method for processing returned light of an idle input branch, aiming at solving the problem of returned light of an idle input branch of an existing fiber laser.
The technical scheme adopted by the invention for solving the technical problems is as follows: the bidirectional pumping fiber laser comprises a plurality of forward pumping sources, a forward beam combiner, a fiber grating, a gain fiber, a reverse beam combiner and a plurality of reverse pumping sources; the spare input branch of the forward beam combiner and the spare input branch of the reverse beam combiner are sequentially welded together to form a welding point, so that the spare input branch of the forward beam combiner and the spare input branch of the reverse beam combiner form a closed loop.
Furthermore, the welding points of the spare input branch of each forward combiner and the spare input branch of each reverse combiner are arranged side by side.
Further, the fiber end faces of the vacant input branches of the forward beam combiners and the vacant input branches of the reverse beam combiners are subjected to angle flattening treatment.
Further, the angle of the fiber end face is less than 0.5 °.
Further, the welding device further comprises a water cooling device, and the welding points are placed in the water cooling device.
Furthermore, a welding point placing area is preset in the water cooling device, and the welding point placing area and the periphery are cleaned before the welding point is placed into the water cooling device.
Further, the end of the vacant input branch of each forward combiner and the end of the vacant input branch of each reverse combiner are provided with optical fiber welding stripping openings, ultraviolet glue is coated on the surfaces of the welding point placement area, the welding point and the optical fiber welding stripping openings, and the ultraviolet glue is irradiated by a UV light source until the ultraviolet glue is completely cured.
Further, a temperature sensor is provided corresponding to the welding point placement area for detecting the temperature of the welding point placement area.
The bidirectional pump fiber laser device further comprises a fiber laser control module, wherein the fiber laser control module compares a preset temperature threshold value with the temperature detected by the temperature sensor, and controls to cut off the power supply of the bidirectional pump fiber laser when the temperature detected by the temperature sensor exceeds the preset temperature threshold value of the fiber laser control module.
The invention also provides a spare input branch return light processing method, which comprises the following steps:
s1: providing a bidirectional pumping fiber laser;
s2: sequentially welding the spare input branches of the forward beam combiner and the reverse beam combiner together to form a welding point;
s3: and placing the welding points in the welding point placing area, and radiating the welding points.
The invention has the advantages that the heat distribution in the resonant cavity of the fiber laser can be effectively balanced by adopting a bidirectional pumping mode, and the light-light conversion efficiency of the laser is improved; and the spare input branches of the forward beam combiner and the reverse beam combiner are welded, so that the influence of return light of the spare input branches of the forward beam combiner and the reverse beam combiner on a light path system is avoided, the laser in the spare input branches of the forward beam combiner and the reverse beam combiner can be promoted to circularly flow in the system, and the laser utilization rate is improved.
Drawings
Embodiments of the invention will be described in further detail below with reference to the following figures and examples, wherein:
FIG. 1 is a schematic structural diagram of a bidirectional pump fiber laser provided by the present invention;
FIG. 2 is a flow chart of a method for processing return light of a spare input branch according to the present invention;
FIG. 3 is a detailed flowchart of step S2 provided by the present invention;
fig. 4 is a detailed flowchart of step S3 provided by the present invention.
Wherein the drawings are described as follows:
10 bidirectional pumping fiber laser;
1 forward pump source 2 forward beam combiner 3 fiber grating 31 high reflecting grating 32 low reflecting grating 4 gain fiber 5 reverse beam combiner 6 reverse pump source 7 stripper 8 fiber output head 9 fusion point placement area 91 fusion point 92 temperature sensor.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Exemplary embodiments according to the present application will now be described in more detail with reference to the accompanying drawings. These exemplary embodiments may, however, be embodied in many different forms and should not be construed as limited to only the embodiments set forth herein. It should be understood that these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of these exemplary embodiments to those skilled in the art.
As shown in fig. 1, the present invention provides a bidirectional pump fiber laser 10, which includes a plurality of forward pump sources 1, a forward beam combiner 2, a fiber grating 3, a gain fiber 4, a backward beam combiner 5, a plurality of backward pump sources 6, a stripper 7, and a fiber output head 8. One end of the stripper 7 is connected with the reverse beam combiner 5, and the other end is connected with an optical fiber output head 8. The fiber grating 3 includes a high reflective grating 31 and a low reflective grating 32 respectively disposed at two ends of the gain fiber 4, the high reflective grating 31 is disposed between the forward beam combiner 2 and the gain fiber 4, and the low reflective grating 32 is disposed between the backward beam combiner 5 and the gain fiber 4.
The free input branch of the forward combiner 2 and the free input branch of the reverse combiner 5 are sequentially welded together to form a welding point 91, so that the free input branch of the forward combiner 2 and the free input branch of the reverse combiner 5 form a closed loop via the fiber grating 3 and the gain fiber 4. The bidirectional pumping mode can effectively balance the heat distribution in the resonant cavity of the fiber laser, improve the light-light conversion efficiency of the laser, and is more favorable for improving the stability and reliability of an optical system. The spare input branches of the forward beam combiner 2 and the reverse beam combiner 5 are welded, so that the influence of return light of the spare input branches of the forward beam combiner 2 and the reverse beam combiner 5 on a light path system is avoided, and the stability of the fiber laser system is ensured; and the laser in the spare input branches of the forward beam combiner 2 and the reverse beam combiner 5 can be promoted to circularly flow in the system, so that the laser utilization rate is improved.
The present invention further includes a water cooling device (not shown in the figure), and different welding points 91 are placed side by side and are placed in the water cooling device, so as to conveniently perform heat dissipation and cooling on the welding points 91, and prevent the optical components or optical fibers in the optical path system from being burnt due to the rapid temperature rise. In general, the forward combiner 2 and the reverse combiner 5 have a plurality of vacant input branches, and the arrangement of the welding points 91 is directed to a treatment method in which two or more welding points 91 are present, but the presence of one welding point 9 is not excluded.
Preferably, the water cooling device is preset with a welding point placing area 9, and before the welding point 91 is placed in the water cooling device, the welding point placing area 9 and the periphery are cleaned by using alcohol, so as to prevent dust and pollutants from causing adverse effects on the welding point 91 on the spare input branch of both the forward beam combiner 2 and the reverse beam combiner 5. The welding point placement region is a region that collectively covers the plurality of welding points 91, and the region falls within the water cooling range of the water cooling device.
As a specific embodiment, in order to ensure a good fusion splicing effect, the end of the vacant input branch of each forward combiner 2 and the end of the vacant input branch of each reverse combiner 5 are stripped to form an optical fiber fusion splicing stripping opening, and the optical fiber end surfaces of the vacant input branch of each forward combiner 2 and the vacant input branch of each reverse combiner 5 are subjected to flat angle processing, so that the angle of the optical fiber end surface is smaller than 0.5 °.
Specifically, the ultraviolet glue is applied to the fusion splice placement area 9, the fusion splice 91, and the fiber fusion splice peel surface, and the ultraviolet glue is irradiated with a UV light source until completely cured. Ultraviolet glues and peels off a mouthful surface coating ultraviolet glue as a heat dissipation through placing region 9 and splice point 91 and fiber fusion at the splice point, helps leading-in to water cooling plant with the laser in the vacant input branch road of forward beam combiner 2 and reverse beam combiner 5, improves the radiating rate of splice point 91 position, avoids the heat gathering, influences fiber laser system's stability.
The present invention further includes a fiber laser control module (not shown) and a temperature sensor 92, the temperature sensor 92 being provided in the weld-spot placing region 9 for detecting the temperature of the weld-spot placing region 9. The temperature sensor 92 sends the detected temperature signal to the fiber laser control module, and the fiber laser control module compares a preset temperature threshold value with the received temperature signal to judge whether the temperature of the welding point placing area 9 exceeds the temperature threshold value; when the temperature of the welding point placing region 9 exceeds the temperature threshold value, the fiber laser control module cuts off the power supply of the bidirectional pumping fiber laser 10 so as to ensure the use safety of the laser.
As shown in fig. 1 to 4, the present invention further provides a method for processing return light of an empty input branch based on the bidirectional pump fiber laser 10, which includes:
s1: providing a bidirectional pump fiber laser 10;
s2: sequentially welding the spare input branches of the forward beam combiner 2 and the reverse beam combiner 5 together to form a welding point 91;
s3: the welding points 91 are placed in the welding point placement area 9, and the welding points 91 are radiated.
Specifically, step S2 includes:
s21: and stripping the tail ends of the spare input branch optical fibers of the forward combiner 2 and the reverse combiner 5 to form an optical fiber fusion splice stripping opening, and carrying out flat angle treatment on the end faces of the optical fibers.
S22: the free input branch optical fiber ends of the forward beam combiner 2 and the reverse beam combiner 5 are welded;
s23: coating ultraviolet glue on the welding point placing area 9, the welding point 91 and the surface of the optical fiber welding stripping;
s24: and irradiating the ultraviolet glue by using a UV light source until the ultraviolet glue is completely cured.
Specifically, step S3 includes:
s31: putting the welding points 91 in a water cooling device in parallel;
s32: a temperature sensor 92 is provided in the weld placement area 9;
s33: the temperature sensor 92 sends the detected temperature signal to the fiber laser control module, and the fiber laser control module compares a preset temperature threshold value with the received temperature signal to judge whether the temperature of the welding point placing area 9 exceeds the temperature threshold value; when the temperature of the fusion point placing region 9 exceeds the temperature threshold, the fiber laser control module cuts off the power supply of the bidirectional pumping fiber laser 10.
It should be understood that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same, and those skilled in the art can modify the technical solutions described in the above embodiments, or make equivalent substitutions for some technical features; and all such modifications and alterations are intended to fall within the scope of the appended claims.
Claims (10)
1. A bidirectional pumping fiber laser is characterized by comprising a plurality of forward pumping sources, a forward beam combiner, a fiber grating, a gain fiber, a reverse beam combiner and a plurality of reverse pumping sources; the spare input branch of the forward beam combiner and the spare input branch of the reverse beam combiner are sequentially welded together to form a welding point, so that the spare input branch of the forward beam combiner and the spare input branch of the reverse beam combiner form a closed loop.
2. A bi-directional pump fiber laser according to claim 1, wherein the fusion points of the free input legs of the forward combiners and the free input legs of the reverse combiners are located side-by-side.
3. A bidirectional pump fiber laser as claimed in any of claims 1 or 2, wherein the fiber end faces of the free input branches of the forward combiners and the free input branches of the reverse combiners are subjected to a flat angle treatment.
4. A bi-directional pump fiber laser according to claim 3, wherein the angle of the fiber end face is less than 0.5 °.
5. A bi-directionally pumped fiber laser as claimed in either of claims 1 or 2, further comprising water cooling means, wherein said fusion point is placed in the water cooling means.
6. The bidirectional pump fiber laser of claim 5, wherein a weld placement region is preset in the water cooling device, and the weld placement region and the periphery are cleaned before the weld is placed in the water cooling device.
7. The bidirectional pump fiber laser of claim 5, wherein the free input branch end of each forward combiner and the free input branch end of each reverse combiner are formed with an optical fiber fusion stripping opening, and the surfaces of the fusion point placement region, the fusion point and the optical fiber fusion stripping opening are coated with an ultraviolet glue, and the ultraviolet glue is irradiated by a UV light source until the ultraviolet glue is completely cured.
8. A bi-directional pump fiber laser according to claim 7, wherein a temperature sensor is provided corresponding to the fusion-site placement region for detecting the temperature of the fusion-site placement region.
9. The bidirectional pump fiber laser of claim 8, further comprising a fiber laser control module that compares a predetermined temperature threshold with a temperature detected by the temperature sensor, the fiber laser control module controlling the bidirectional pump fiber laser to be powered off when the temperature detected by the temperature sensor exceeds the predetermined temperature threshold of the fiber laser control module.
10. A spare input branch return light processing method is characterized by comprising the following steps:
s1: providing a bidirectional pumping fiber laser;
s2: sequentially welding the spare input branches of the forward beam combiner and the reverse beam combiner together to form a welding point;
s3: and placing the welding points in the welding point placing area, and radiating the welding points.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011057405.0A CN112234416A (en) | 2020-09-29 | 2020-09-29 | Bidirectional pumping fiber laser and spare input branch return light processing method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011057405.0A CN112234416A (en) | 2020-09-29 | 2020-09-29 | Bidirectional pumping fiber laser and spare input branch return light processing method |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040196537A1 (en) * | 2003-02-11 | 2004-10-07 | Andrei Starodoumov | Optical fiber coupling arrangement |
| CN107516811A (en) * | 2017-09-30 | 2017-12-26 | 清华大学 | Fiber amplifier and multi-stage fiber amplifier system |
| CN107732641A (en) * | 2017-11-10 | 2018-02-23 | 山东大学 | High-capacity optical fiber laser |
| CN108390246A (en) * | 2018-04-28 | 2018-08-10 | 无锡源清瑞光激光科技有限公司 | A kind of quasi-continuous optical fiber laser of module chemical combination beam |
| CN212935127U (en) * | 2020-06-10 | 2021-04-09 | 苏州创鑫激光科技有限公司 | Laser device |
-
2020
- 2020-09-29 CN CN202011057405.0A patent/CN112234416A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040196537A1 (en) * | 2003-02-11 | 2004-10-07 | Andrei Starodoumov | Optical fiber coupling arrangement |
| CN107516811A (en) * | 2017-09-30 | 2017-12-26 | 清华大学 | Fiber amplifier and multi-stage fiber amplifier system |
| CN107732641A (en) * | 2017-11-10 | 2018-02-23 | 山东大学 | High-capacity optical fiber laser |
| CN108390246A (en) * | 2018-04-28 | 2018-08-10 | 无锡源清瑞光激光科技有限公司 | A kind of quasi-continuous optical fiber laser of module chemical combination beam |
| CN212935127U (en) * | 2020-06-10 | 2021-04-09 | 苏州创鑫激光科技有限公司 | Laser device |
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