CN113708199A - Non-water-cooling multimode selective fiber laser system - Google Patents
Non-water-cooling multimode selective fiber laser system Download PDFInfo
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- CN113708199A CN113708199A CN202110920474.8A CN202110920474A CN113708199A CN 113708199 A CN113708199 A CN 113708199A CN 202110920474 A CN202110920474 A CN 202110920474A CN 113708199 A CN113708199 A CN 113708199A
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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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- 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
- H01S3/0014—Monitoring arrangements not otherwise provided for
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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
- H01S3/08—Construction or shape of optical resonators or components thereof
- H01S3/08086—Multiple-wavelength emission
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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
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/101—Lasers provided with means to change the location from which, or the direction in which, laser radiation is emitted
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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
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/102—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling the active medium, e.g. by controlling the processes or apparatus for excitation
- H01S3/1028—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling the active medium, e.g. by controlling the processes or apparatus for excitation by controlling the temperature
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- Optics & Photonics (AREA)
- Lasers (AREA)
Abstract
A non-water-cooling multimode selective fiber laser system comprises a cooling platform and a control system, wherein the cooling platform is provided with a plurality of semiconductor lasers, an N +1 optical fiber beam combiner and an optical fiber gain cavity, and the output end of the optical fiber gain cavity is connected with an optical fiber output optical cable; the control system comprises a control circuit and control system software, the control system software comprises a semiconductor laser power supply control system, a cooling control system and a temperature monitoring system, the cooling control system is connected with the phase-change type variable-frequency compression cooling system, and a refrigerant flow channel of the phase-change type variable-frequency compression cooling system is connected with the cooling platform. The invention overcomes the defects of the prior art, can realize that one laser outputs various different beam shapes, can respectively realize the functions of a fiber laser, a composite laser system and a semiconductor laser through a single laser, and realizes the composite laser vortex light output of high-energy-density small-spot laser and low-energy-density large-spot laser.
Description
Technical Field
The invention relates to the technical field of fiber lasers, in particular to a non-water-cooling multi-mode selection fiber laser system.
Background
In the optical fiber laser, the light beam and light spot mode output by the traditional laser is generally single; the traditional industrial laser depends on huge water-cooling equipment except the laser, the adjustable interval of water-cooling is small, the reaction is slow, and the factors greatly restrict various applications and applicable scenes of the laser; at present, a fiber laser with a plurality of light spot output modes basically depends on increasing a semiconductor laser capable of outputting a fixed wavelength (non-absorption range), or a mode of changing the output wavelength of the semiconductor laser by using a mode of changing current, and a mode of generating pumping light which is not absorbed by a gain cavity system of the fiber laser by using the above mode. The composite laser of the high-energy-density small-spot laser and the low-energy-density large-spot laser has various applications, such as welding, tapering and the like, and it can be predicted that if the vortex output of the composite laser of the high-energy-density small-spot laser and the low-energy-density large-spot laser can be realized, the welding of materials with special materials and shapes and the uniform tapering of special optical fibers can be greatly improved, the composite laser can also be used for complex optical manipulation, and an effective mode for realizing the vortex output of the composite laser of the high-energy-density small-spot laser and the low-energy-density large-spot laser does not exist at present.
The existing fiber laser with multiple output modes is basically realized by adding a semiconductor laser capable of generating fixed wavelength (non-absorption range), and is partially realized by adjusting current; but has the disadvantages that: 1. the principle of current regulation is that the absorption rate of a gain cavity of a semiconductor laser is changed by utilizing the characteristic that the semiconductor laser outputs different wavelengths at different currents, so that a composite light spot form is generated; in the method, the electro-optical efficiency of the laser is low at low current, and the stability of the laser is poor at high current; 2. by adding a semiconductor laser with fixed wavelength (non-absorption range), the cost is high due to the additional semiconductor laser, and a special beam combiner needs to be matched, so that the limitation of an optical device is large; 3. conventional fiber lasers basically require an external water cooling system.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a non-water-cooling multi-mode selection optical fiber laser system, which overcomes the defects of the prior art, has reasonable design, can realize the output of various different beam shapes by one laser, can respectively realize the functions of the optical fiber laser, a composite laser system and a semiconductor laser and the output of composite laser vortex light of high-energy-density small-spot laser and low-energy-density large-spot laser by a single laser, and applies a photonic crystal array to improve the topological charge number of the composite vortex rotation.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a non-water-cooling multimode selective optical fiber laser system comprises a cooling platform and a control system, wherein the cooling platform is provided with a plurality of semiconductor lasers, an N +1 optical fiber beam combiner and an optical fiber gain cavity, the laser output ends of the semiconductor lasers are matched with the input end of the N +1 optical fiber beam combiner, the output end of the N +1 optical fiber beam combiner is connected with the input end of the optical fiber gain cavity, and the output end of the optical fiber gain cavity is connected with an optical fiber output optical cable;
the control system comprises a control circuit and control system software, the control system software comprises a semiconductor laser power supply control system, a cooling control system and a temperature monitoring system, the semiconductor laser power supply control system is electrically connected with the semiconductor laser, the monitoring end of the temperature monitoring system is positioned on the cooling platform and used for monitoring the temperature of the cooling platform in real time, the signal output end of the temperature monitoring system is connected with the signal input end of the cooling control system, the output end of the cooling control system is connected with the control end of the phase-change type variable-frequency compression cooling system, and the refrigerant flow channel of the phase-change type variable-frequency compression cooling system is connected with the cooling platform.
Preferably, the optical fiber gain cavity comprises a ytterbium-doped gain optical fiber, and a first grating and a second grating which are positioned at two ends of the ytterbium-doped gain optical fiber, the output end of the N +1 optical fiber combiner is connected with the first grating, and the output end of the second grating is connected with the optical fiber output optical cable.
Preferably, the optical fiber output optical cable is a water-cooling-free QBH output optical cable, and comprises QBH, QCS, QD +, and the like.
The invention provides a non-water-cooling multimode selective fiber laser system. The method has the following beneficial effects: the power of the phase-change type variable-frequency compression cooling system is controlled through the cooling control system, so that the temperature of the water cooling platform can be subjected to variable-frequency adjustment in real time, and the temperature control is more accurate; and controlling the output wavelength of the semiconductor laser by changing the temperature; the semiconductor can be ensured to work under a stable current condition all the time; and the laser can output various different beam shapes, the functions of the fiber laser, the composite laser system and the semiconductor laser can be realized through a single laser, the composite laser vortex light output of high-energy-density small-spot laser and low-energy-density large-spot laser can be realized, and the topological charge number of the composite vortex optical rotation is improved by applying the photonic crystal array.
Drawings
In order to more clearly illustrate the present invention or the prior art solutions, the drawings that are needed in the description of the prior art will be briefly described below.
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic block diagram of the control system of the present invention;
the reference numbers in the figures illustrate:
1. a cooling platform; 2. a control system; 3. a semiconductor laser; 4. an N +1 optical fiber combiner; 5. a fiber gain cavity; 6. an optical fiber output cable; 7. a phase-change variable frequency compression cooling system; 21. a semiconductor laser power supply control system; 22. a cooling control system; 23. a temperature monitoring system; 51. an ytterbium-doped gain fiber; 52. a first grating; 53. a second grating.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings.
As shown in fig. 1-2, a non-water-cooling multimode selective fiber laser system includes a cooling platform 1 and a control system 2, wherein the cooling platform 1 is provided with a plurality of semiconductor lasers 3, N +1 optical fiber beam combiners 4 and an optical fiber gain cavity 5, laser output ends of the semiconductor lasers 3 are all matched with an input end of the N +1 optical fiber beam combiner 4, an output end of the N +1 optical fiber beam combiner 4 is connected with an input end of the optical fiber gain cavity 5, and an output end of the optical fiber gain cavity 5 is connected with an optical fiber output cable 6;
the control system 2 comprises a control circuit and control system software, the control system software comprises a semiconductor laser power supply control system 21, a cooling control system 22 and a temperature monitoring system 23, the semiconductor laser power supply control system 21 is connected with the semiconductor laser 3 and is used for performing power supply regulation control on the semiconductor laser 3 and controlling the output power of a semiconductor; the monitoring end of the temperature monitoring system 23 is positioned on the cooling platform 1 and is used for monitoring the temperature of the cooling platform 1 in real time, the signal output end of the temperature monitoring system 23 is connected with the signal input end of the cooling control system 22, the output end of the cooling control system 22 is connected with the control end of the phase-change type variable-frequency compression cooling system 7, and the refrigerant flow channel of the phase-change type variable-frequency compression cooling system 7 is connected with the cooling platform 1; the cooling control system 22 is used for sending different working instructions to the phase-change type variable-frequency compression cooling system 7 so as to cool the cooling platform 1 at different temperatures; and the real-time temperature of the cooling platform 1 is adjusted by combining the temperature monitoring system 23, so that the cooling temperature of the cooling platform 1 is not obviously changed in one working mode.
In this embodiment, the semiconductor laser 3 is used to provide 976nm pump laser light that is absorbed by the gain cavity at a certain temperature point; 6 semiconductor lasers 3 are adopted, and any semiconductor laser 3 can be combined with the forward N +1 optical fiber beam combiner 4 if special application requirements exist; the semiconductor laser 3 with different wavelengths can also be matched according to different types of gain optical fibers, such as 915nm and the like; the semiconductor laser modules with various arbitrary wavelengths can be selected according to the characteristics of the gain medium, and are matched through different light spots under different cooling temperature settings;
in this embodiment, the N +1 optical fiber combiner 4 is configured to combine the N semiconductor lasers 3 into one transmission optical fiber;
in this embodiment, the optical fiber gain cavity 5 includes a ytterbium-doped gain optical fiber 51, and a first grating 52 and a second grating 53 located at two ends of the ytterbium-doped gain optical fiber 51, an output end of the N +1 optical fiber combiner 4 is connected to the first grating 52, and an output end of the second grating 53 is connected to the optical fiber output cable 6. When the semiconductor laser 3 emits 976nm pump laser, the gain cavity absorbs the pump laser and performs gain amplification to generate gain laser (1070nm) transmitted by the fiber core, when the semiconductor laser 3 emits laser of other wave bands (such as above 986 nm), the gain cavity only absorbs a very small amount of pump laser, and the rest pump laser continues to be transmitted forwards along the gain cavity fiber; in the present application, the ytterbium-doped gain fiber 51 may design gain fibers with different lengths according to the absorption rate of the gain fiber to change the absorption saturation threshold, so that the laser outputs light spot beams of multiple modes;
in the present embodiment, the optical fiber output cable 6 is a no-water-cooling QBH output cable, such as QBH, QCS, QD, Q +, and the like, and is used for transmitting the laser beam generated or transmitted from the optical fiber gain cavity 5 to the surface of the workpiece;
in this embodiment, a spatial light modulator controlled by a vortex light controller is coupled behind the optical fiber output optical cable 6, the spatial light modulator is a photonic crystal fiber, the optical fiber has a microstructure array arranged perpendicular to the direction of the optical fiber at a specific cross section, and vortex light of the composite light of the high-energy-density small-spot laser beam and the low-energy-density large-spot laser beam is output.
In this embodiment, the phase-change type variable-frequency compression cooling system 7 is composed of a variable-frequency compressor, a condenser, an evaporator, a refrigerant storage tank, an expansion valve, and a blower, and is a typical phase-change type variable-frequency compression cooling system for providing temperature cooling with a large temperature difference for the semiconductor laser. Adopt single phase transition formula inverter compressor system to cool off all semiconductor laser in this embodiment, also can adopt multiunit phase transition formula inverter compressor system, carry out the cooling of different temperatures respectively to multiple semiconductor laser, realize more various gain collocation.
The working principle is as follows:
when the cooling platform is used, the control system 2 sends corresponding instructions to the phase-change type variable-frequency compression cooling system 7 through the cooling control system 22 according to the working mode required by a user, the phase-change type variable-frequency compression cooling system 7 can run at different powers according to the instructions, the cooling platform 1 is connected through a refrigerant flow channel, the cooling platform 1 is cooled at different temperatures, a temperature signal of the cooling platform 1 is transmitted to the cooling control system 22 through the temperature monitoring system 23 in real time, and the cooling control system 22 can carry out variable-frequency regulation on the phase-change type variable-frequency compression cooling system 7 according to the feedback of the real-time temperature so as to ensure that the temperature of the cooling platform 1 does not change obviously; the semiconductor laser 3 arranged on the cooling platform 1 can be influenced by different cooling temperatures, and the semiconductor laser 3 can emit pump laser with different wavelengths after power supply;
working condition 1: when the temperature of the cooling platform 1 is 20 ℃, the semiconductor laser 3 can emit 976nm pump laser, the pump laser is combined by the N +1 optical fiber combiner 4 and is conducted to the optical fiber gain cavity 5, the optical fiber gain cavity 5 can absorb and amplify the 976nm pump laser to 1070nm laser, and the laser is transmitted and output by the optical fiber output optical cable 6 to form a high-energy-density small-spot laser beam for application of plate cutting and the like;
working condition 2: when the temperature of the cooling platform 1 is 40 ℃, the pumping laser wavelength emitted by the semiconductor laser 3 can be increased to above 986nm, the pumping laser can be combined by the N +1 optical fiber combiner 4 and is conducted to the optical fiber gain cavity 5, the optical fiber gain cavity 5 only can absorb a very small amount of pumping laser, most of the unabsorbed pumping laser can continue to be transmitted forwards along the optical fiber cladding of the gain cavity and is transmitted and output by the optical fiber output optical cable 6, so that a large light spot laser beam with low energy density is formed, and the large light spot laser beam can be used for cladding and other applications;
working mode 3: when the temperature of the cooling platform 1 is 30 ℃, the pumping laser wavelength emitted by the semiconductor laser 3 is raised to 980nm, the pumping laser is combined by the N +1 optical fiber combiner 4 and is conducted into the optical fiber gain cavity 5, the optical fiber gain cavity 5 is in a semi-absorption state, namely only a part of the pumping laser is absorbed and amplified to 1070nm laser, the other part of the unabsorbed pumping laser is not absorbed by the optical fiber gain cavity 5, the laser amplified to 1070nm by gain and the unabsorbed pumping light are respectively transmitted forward along the fiber core and the cladding of the gain cavity fiber, and finally the laser is transmitted and output by the optical fiber output cable 6 to form a composite light spot beam with high central energy density and low peripheral energy density, which can be used for welding and other applications;
the system can enable the laser system to normally work without any water cooling system assistance, and can generate various laser matching output modes to adapt to different laser processing process requirements.
The system can carry out frequency conversion adjustment on the temperature of the water cooling platform in real time in a frequency conversion mode in a refrigeration mode of the phase-change type frequency conversion compressor, so that the temperature control is more accurate; and controlling the output wavelength of the semiconductor laser by changing the temperature; the semiconductor can be ensured to work under a stable current condition all the time; and can realize that a laser outputs multiple different beam shapes, can realize the function of fiber laser, compound laser system and semiconductor laser respectively through single laser.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (6)
1. A water-cooling-free multimode selective fiber laser system, characterized by: the cooling system comprises a cooling platform (1) and a control system (2), wherein a plurality of semiconductor lasers (3), an N +1 optical fiber beam combiner (4) and an optical fiber gain cavity (5) are arranged on the cooling platform (1), the laser output ends of the semiconductor lasers (3) are matched with the input end of the N +1 optical fiber beam combiner (4), the output end of the N +1 optical fiber beam combiner (4) is connected with the input end of the optical fiber gain cavity (5), and the output end of the optical fiber gain cavity (5) is connected with an optical fiber output optical cable (6);
control system (2) include semiconductor laser power supply control system (21), cooling control system (22) and temperature monitoring system (23), semiconductor laser power supply control system (21) and semiconductor laser (3) electrode connection, temperature monitoring system (23) are used for carrying out real-time temperature monitoring, the signal output part of temperature monitoring system (23) is connected with the signal input part of cooling control system (22), the output of cooling control system (22) is connected with the control end of cooling system (7).
2. The non-water-cooled multimode selective fiber laser system of claim 1, wherein: the optical fiber gain cavity (5) comprises an ytterbium-doped gain optical fiber (51), a first grating (52) and a second grating (53) which are positioned at two ends of the ytterbium-doped gain optical fiber (51), the output end of the N +1 optical fiber beam combiner (4) is connected with the first grating (52), and the output end of the second grating (53) is connected with an optical fiber output optical cable (6).
3. The non-water-cooled multimode selective fiber laser system of claim 1, wherein: the optical fiber output optical cable (6) is a water-cooling-free QBH output optical cable.
4. The non-water-cooled multimode selective fiber laser system of claim 1, wherein: the monitoring end of the temperature monitoring system (23) is positioned on the cooling platform (1) and used for monitoring the temperature of the cooling platform (1) in real time, and a refrigerant flow channel of the phase-change type variable-frequency compression cooling system (7) is connected with the cooling platform (1).
5. The non-water-cooled multimode selective fiber laser system of claim 1, wherein: the semiconductor laser (3) is 6 beams, wherein the working temperature of the three beams of semiconductor lasers (3) is controlled to be 20 ℃, and the output wavelength of the semiconductor laser (3) is 976 nm; in addition, the working temperature of the three-beam semiconductor laser (3) is 40 ℃, and the output wavelength of the semiconductor laser (3) is more than 986 nm.
6. The non-water-cooled multimode selective fiber laser system of claim 1, wherein: the end part of the optical fiber output optical cable (6) is coupled with a spatial light modulator, and the spatial light modulator is a photonic crystal optical fiber.
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| CN202110920474.8A CN113708199A (en) | 2021-08-11 | 2021-08-11 | Non-water-cooling multimode selective fiber laser system |
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| CN202110920474.8A CN113708199A (en) | 2021-08-11 | 2021-08-11 | Non-water-cooling multimode selective fiber laser system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2023109721A1 (en) * | 2021-12-19 | 2023-06-22 | 光惠（上海）激光科技有限公司 | Compression-refrigeration fiber laser |
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