CN116470376A - Optical fiber laser and light output control method thereof - Google Patents
Optical fiber laser and light output control method thereof Download PDFInfo
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- CN116470376A CN116470376A CN202310388775.XA CN202310388775A CN116470376A CN 116470376 A CN116470376 A CN 116470376A CN 202310388775 A CN202310388775 A CN 202310388775A CN 116470376 A CN116470376 A CN 116470376A
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- 238000000034 method Methods 0.000 title claims abstract description 32
- 239000013307 optical fiber Substances 0.000 title description 58
- 239000000835 fiber Substances 0.000 claims abstract description 129
- 238000010168 coupling process Methods 0.000 claims abstract description 55
- 238000005859 coupling reaction Methods 0.000 claims abstract description 55
- 230000008878 coupling Effects 0.000 claims abstract description 54
- 230000005540 biological transmission Effects 0.000 claims abstract description 18
- 238000012544 monitoring process Methods 0.000 claims description 51
- 230000003287 optical effect Effects 0.000 claims description 37
- 238000005253 cladding Methods 0.000 claims description 32
- 230000008054 signal transmission Effects 0.000 claims description 16
- 239000002699 waste material Substances 0.000 claims description 7
- 238000011084 recovery Methods 0.000 claims description 5
- 238000002310 reflectometry Methods 0.000 claims description 5
- 230000017525 heat dissipation Effects 0.000 abstract description 9
- 238000004519 manufacturing process Methods 0.000 abstract description 9
- 238000010923 batch production Methods 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 230000010354 integration Effects 0.000 abstract description 3
- 230000000903 blocking effect Effects 0.000 description 9
- 229910052775 Thulium Inorganic materials 0.000 description 6
- FRNOGLGSGLTDKL-UHFFFAOYSA-N thulium atom Chemical compound [Tm] FRNOGLGSGLTDKL-UHFFFAOYSA-N 0.000 description 6
- 238000002360 preparation method Methods 0.000 description 5
- 238000010521 absorption reaction Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000002265 prevention Effects 0.000 description 4
- 238000001816 cooling Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 230000010355 oscillation Effects 0.000 description 3
- 238000004064 recycling Methods 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
- 238000003466 welding 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
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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
- H01S3/005—Optical devices external to the laser cavity, specially adapted for lasers, e.g. for homogenisation of the beam or for manipulating laser pulses, e.g. pulse shaping
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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
- H01S3/005—Optical devices external to the laser cavity, specially adapted for lasers, e.g. for homogenisation of the beam or for manipulating laser pulses, e.g. pulse shaping
- H01S3/0071—Beam steering, e.g. whereby a mirror outside the cavity is present to change the beam direction
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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
- H01S3/005—Optical devices external to the laser cavity, specially adapted for lasers, e.g. for homogenisation of the beam or for manipulating laser pulses, e.g. pulse shaping
- H01S3/0085—Modulating the output, i.e. the laser beam is modulated outside the laser cavity
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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
- H01S3/06754—Fibre amplifiers
- H01S3/06758—Tandem amplifiers
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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
- H01S3/06754—Fibre amplifiers
- H01S3/06783—Amplifying coupler
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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
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Abstract
The invention relates to a fiber laser, which is sequentially provided with an oscillator module, a beam splitter module, an amplifier module, a beam combiner module and a coupling module which are connected with each other along the transmission direction of laser signals, wherein the amplifier module comprises at least two amplifiers which are connected in parallel, the input end of each amplifier is connected with the output end of the beam splitter module, and the output end of each amplifier is connected with the input end of the beam combiner module; and the oscillator module, the beam splitter module, the amplifier module, the beam combiner module and the coupling module are all independently packaged. The invention passes through. Compared with the fiber laser with a linear structure in the prior art, the embodiment of the invention improves the average power and the peak power of laser output, avoids heat concentration, is easy to manage in heat dissipation, and improves the stability and the reliability of the system; and each module adopts an independently packaged modularized structure, so that the complexity of laser integration is reduced, and the method is beneficial to batch production and production cost reduction.
Description
Technical Field
The invention relates to the technical field of lasers, in particular to an optical fiber laser and a light emitting control method thereof.
Background
The fiber laser uses rare earth doped fiber as gain medium, and has the advantages of high energy conversion rate, good output beam quality, compact and stable structure, good heat dissipation performance, long service life, etc. compared with other lasers, the fiber laser has fast development and wide application.
In the prior art, the fiber laser mainly adopts a linear structure, and the single resonant cavity is used for oscillating to finish high-power laser output, or the laser oscillating signal is used for amplifying the laser oscillating signal in multiple stages and outputting the laser with high power, and the fiber laser with the linear structure has the following defects: the fiber laser with the linear structure emits laser, so that energy loss is high, the lost energy can directly generate heat, the heat is concentrated, the stability of the laser is relatively low, and the design difficulty of cold and heat management is increased; in order to obtain higher-power laser output, the fiber core size and the cladding size of the optical fiber of the fiber laser with the linear structure are increased, the preparation difficulty of large-size optical fibers and related devices is high, the price is high, the dependence on an international optical fiber supply chain is serious, the influence of macroscopic factors is easy to occur, the batch manufacturing opportunity for the optical fiber laser with high average power and high peak power is difficult to obtain, and the current batch medical instrument manufacturing requirement is difficult to adapt.
Disclosure of Invention
In order to solve the above technical problems, a first aspect of the present invention provides an optical fiber laser, which is used to solve the technical problems of excessive heat concentration, difficulty in increasing average power, difficulty in increasing peak power, high cost and poor system stability of an optical fiber laser adopting a linear structure in the prior art.
The first aspect of the present invention provides an optical fiber laser, which is sequentially provided with an oscillator module, a beam splitter module, an amplifier module, a beam combiner module and a coupling module which are connected with each other along a transmission direction of a laser signal, wherein the amplifier module comprises at least two amplifiers which are connected in parallel, an input end of each of the amplifiers is connected with an output end of the beam splitter module, and an output end of each of the amplifiers is connected with an input end of the beam combiner module; and the oscillator module, the beam splitter module, the amplifier module, the combiner module, and the coupling module are all independently packaged.
The fiber laser provided by the invention improves the average power and peak power of laser output, avoids heat concentration, is easy to manage in heat dissipation, and improves the stability and reliability of a system; and each module adopts an independently packaged modularized structure, so that the complexity of laser integration is reduced, and the method is beneficial to batch production and production cost reduction.
Further, along the transmission direction of the laser signal, the oscillator module includes a first grating, a first gain optical fiber, a first beam combiner assembly and a second grating which are connected in sequence, the first beam combiner assembly includes a first beam combiner and a first pump source, an input end of the first beam combiner is connected to the first gain optical fiber, an output end of the first beam combiner is connected to an input end of the second grating, a pump input end of the first beam combiner is connected to the first pump source, wherein a pump signal direction of the first pump source is opposite to an output direction of the laser signal, and a reflectivity of the first grating is larger than a reflectivity of the second grating.
Further, along the transmission direction of the laser signal, the amplifier includes a second beam combiner assembly, a second gain optical fiber and a cladding light stripper, which are sequentially connected with each other, the second beam combiner assembly includes a second beam combiner and at least two second pump sources, each of the second pump sources is respectively connected to a pump input end of the second beam combiner, an input end of the second beam combiner is connected to an output end of the beam splitter module, an output end of the second beam combiner is connected to the second gain optical fiber, and an output end of the cladding light stripper is connected to an input end of the beam combiner module, wherein a pump signal direction of the second pump source is the same as an output direction of the laser signal.
In the optical fiber laser provided by the embodiment of the invention, each amplifier adopts the same second pumping source, the beam combination correlation is good, and the high power output of the optical fiber laser is realized through beam combination.
Further, the core diameter of the first gain fiber is between 6 μm and 10 μm, the cladding diameter of the first gain fiber is between 80 μm and 130 μm, and the length of the first gain fiber is between 4 μm and 6 μm.
The oscillator module in the fiber laser provided by the invention adopts the small-sized optical fiber, on one hand, the preparation difficulty of the optical fiber and related devices such as a beam combiner and a beam splitter is reduced, the international supply chain dependence degree on the optical fiber is reduced, and the cost of the optical fiber and related devices is saved compared with the fiber laser with a linear structure adopted in the prior art under the condition of meeting the requirement of certain output power; the size of the first gain fiber is in a certain range, so that the absorption of the oscillator module to the pump is ensured.
Further, the second gain fiber has a core diameter of between 10 μm and 30 μm, a cladding diameter of between 80 μm and 130 μm, and a length of between 4 μm and 6 μm.
The amplifier module in the optical fiber laser provided by the invention adopts the small-sized optical fiber, on one hand, the preparation difficulty of the optical fiber and related devices is reduced, the international supply chain dependency degree of the optical fiber is reduced, and the cost of the optical fiber and related devices is saved compared with the optical fiber laser with a linear structure adopted in the prior art under the condition of meeting the requirement of certain output power; on the other hand, the heat effect generated by adopting the large-core optical fiber in the prior art is dispersed in a plurality of small-core optical fibers, so that heat concentration is avoided, the heat dissipation efficiency is improved, the heat dissipation is easy to manage, and the manufacturing difficulty and the manufacturing cost of the optical fiber laser are reduced; the second gain fiber has a size within a certain range, which ensures the absorption of the pump by the amplifier.
Further, the amplifier module further comprises a waste light recovery unit for recovering the cladding pump light and the cladding laser light stripped by the cladding light stripper, and the waste light recovery unit is connected with each amplifier in parallel and connected with the input end of the beam combiner module.
Further, the coupling module includes a housing provided with an incident light port and an outgoing light port, and along a transmission direction of the laser signal, the coupling module includes a mirror group and a focusing lens located in the housing, and the mirror group is configured to: the laser beam output by the output end of the beam combiner module, which enters from the incident light port, is reflected to the focusing lens and is output by the emergent light port.
The coupling module in the fiber laser provided by the invention is provided with the reflecting mirror group and the focusing lens, so that the transmission direction of laser signals is changed, and the laser signals are output through the focusing lens, and the coupling efficiency of an optical path is improved; in addition, the size of the coupling module and thus the fiber laser can be reduced.
Further, the reflector group comprises a first reflector and a second reflector which is arranged at intervals with the first reflector, the first reflector is used for receiving the laser which enters from the incident light port and is output by the output end of the beam combiner module, and the second reflector is used for receiving the laser reflected by the first reflector and reflecting the laser to the focusing lens;
The coupling module further comprises an explosion-proof screen positioned in the shell, and the explosion-proof screen is arranged between the focusing lens and the emergent light port.
The explosion-proof screen in the fiber laser provided by the invention is used for protecting the focusing lens and playing a role in dust prevention and pollution prevention on a laser output light path.
Further, the coupling module further includes a shutter located within the housing, the shutter configured to: for blocking the optical path of the laser signal transmission or deviating from the optical path of the laser signal transmission.
According to the optical gate in the fiber laser, after the laser is closed, the optical gate moves to the optical path of the laser signal transmission to shield light, so that accidental opening of the laser is avoided, and the mistakenly-emitted laser hurts a human body.
Further, the oscillator module further comprises a first isolator module, wherein the first isolator module is arranged between the output end of the second grating and the input end of the beam splitter module; and/or the number of the groups of groups,
the coupling module further comprises a second isolator module positioned in the shell, the second isolator module is connected to the output end of the beam combiner module, and laser output by the output end of the beam combiner module is isolated by the second isolator module to output collimated light to be incident to the first reflecting mirror.
Further, one of the beam splitter output ends is connected with a first laser power monitoring component for monitoring the laser intensity in the oscillator module or for monitoring whether the laser output exists in the oscillator module;
the output end of the cladding light stripper is connected with a second laser power monitoring component for monitoring the laser intensity in any one of the amplifiers or for monitoring whether the laser output exists in any one of the amplifiers;
and/or the coupling module comprises a third laser power monitoring component arranged in the shell, wherein the third laser power monitoring component is positioned at one side of the second reflector away from the first reflector and is used for monitoring the intensity of laser transmitted through the second reflector or monitoring whether laser transmits through the second reflector.
The second aspect of the present invention provides a light output control method of an optical fiber laser, which is applied to the optical fiber laser, and the light output control method of the optical fiber laser includes:
controlling the system enable signal to be high at a first time;
controlling a switching signal of the oscillator module to be high level at a second moment;
controlling a shutter switching signal of the coupling module to be high at a third time, the coupling module including a shutter configured to control the shutter to block or deviate from an optical path of the laser signal transmission;
Controlling a switching signal of the amplifier module to be high level at a fourth time;
wherein the second time is later than the first time, the third time is later than the second time, and the fourth time is later than the third time.
The optical output control method of the fiber laser provided by the invention sets the sequence of the high level of the enabling signal of the control system, the switching signal of the oscillator module, the switching signal of the optical gate of the coupling module and the switching signal of the amplifier module, prevents the second gain fiber of the amplifier from being damaged when the laser output by the oscillator module is not input, and ensures the stable operation of the fiber laser.
Further, the output end of the beam splitter module is connected with a first laser power monitoring component, and the beam splitter module further comprises: the first laser power monitoring component monitors that there is a laser output in the oscillator module.
Further, the light output control method of the fiber laser further comprises the following steps:
controlling the system enable signal to be low at a fifth moment;
controlling a switching signal of the amplifier module to be low level at a sixth moment; or when the switching signal input by a user at the sixth moment is at a low level, simultaneously controlling the switching signal of the amplifier module to be at the low level;
Controlling a shutter switch signal of the coupling module to be low level at a seventh moment;
controlling a switching signal of the amplifier module to be low level at an eighth moment;
wherein the fifth time is later than the fourth time, the sixth time is later than the fifth time, the seventh time is later than the sixth time, and the eighth time is later than the seventh time.
According to the light output control method of the fiber laser, provided by the invention, the sequence of low level of the enabling signal of the control system, the switching signal of the oscillator module, the switching signal of the optical gate of the coupling module and the switching signal of the amplifier module is set, so that on one hand, the damage of the second gain fiber of the amplifier caused by the fact that the second gain fiber is not used for outputting laser output by the oscillator module is prevented, and the stable operation of the fiber laser is ensured; on the other hand, when the switch signal of the amplifier module is low level, the switch signal of the optical gate is low level, and the optical gate moves to the optical path of the laser signal transmission to shield the light, so that the accidental opening of the laser is avoided, and the mistaken laser hurts the human body.
Further, a second laser power monitoring unit is connected to each of the amplifiers, and the second laser power monitoring unit further includes, between the sixth time and the eighth time:
The second laser power monitoring component monitors that no laser output is present in the amplifier.
Further, the light output control method of the fiber laser further comprises the following steps: the switching signal input by the user is at a high level at a ninth time, and the ninth time is between the second time and the third time.
Further, the light output control method of the fiber laser further comprises the following steps:
at the tenth moment, if the switching signal input by the user is at a low level, simultaneously controlling the switching signal of the amplifier module to be at a low level;
at the eleventh time, the optical gate switch signal of the coupling module is at a low level;
at the twelfth moment, if the switching signal input by the user is at a high level;
the optical gate switch signal of the coupling module is at a high level at thirteenth moment;
controlling a switching signal of the amplifier module to be high level at a fourteenth moment;
wherein the eleventh time is later than the tenth time, the twelfth time is later than the eleventh time, the thirteenth time is later than the twelfth time, the fourteenth time is later than the thirteenth time, and the tenth to fourteenth times are all between the third and eighth times.
The fiber laser provided by the embodiment of the invention can control the switching signal of the amplifier module to be high level or low level at any time based on the switching signal input by a user during the period that the system enabling signal and the switching signal of the oscillator module are high level, namely, the laser output or closing of the amplifier module is controlled at any time.
Drawings
FIG. 1 is a schematic diagram of an overall distribution structure of a fiber laser according to an embodiment of the present invention;
fig. 2 is a schematic diagram of an oscillator module of a fiber laser according to an embodiment of the present invention;
fig. 3 is a schematic diagram of an amplifier structure of a fiber laser according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a coupler module of a fiber laser according to an embodiment of the present invention;
FIG. 5 is a timing chart of the light output control of the fiber laser according to the embodiment of the present invention;
reference numerals illustrate:
a 100-oscillator module; 110-a first grating; 120-a first gain fiber; 130-a first combiner assembly; 131-a first combiner; 132-a first pump source; 140-a second isolator; 150-a first isolation module;
200-a beam splitter module; 201-a first laser power monitoring component;
a 300-amp module; 310-an amplifier; 320-a second combiner assembly; 321-a second beam combiner; 322-a second pump source; 330-a second gain fiber; 340-a cladding light stripper; 350-a second laser power monitoring component; 360-a waste light recovery unit;
400-combiner module;
500-coupling modules; 501-an incident light port; 502-an exit light port; 510-a housing; 520-mirror group; 521-a first mirror; 522-a second mirror; 530-a focusing lens; 540-explosion-proof screen; 550-shutter; 560-a second isolation module; 570-a third laser power monitoring component;
Detailed Description
In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments accompanied with figures 1 to 5 are described in detail below, wherein the directions indicated by arrows in figures 2 and 3 are directions of laser signal transmission.
A first aspect of an embodiment of the present invention provides a fiber laser.
Referring to fig. 1, the fiber laser is provided with an oscillator module 100, a beam splitter module 200, an amplifier module 300, a beam combiner module 400 and a coupling module 500 which are connected with each other in sequence along the transmission direction of laser signals, wherein the amplifier module 300 comprises at least two amplifiers 310 connected in parallel, the input end of each amplifier 310 is connected with the output end of the beam splitter module 200, and the output end of each amplifier 310 is connected with the input end of the beam combiner module 400; and the oscillator module 100, the beam splitter module 200, the amplifier module 300, the combiner module 400, and the coupling module 500 are all packaged independently.
It should be noted that:
comparative example: the thulium optical fiber is adopted for experiments, the laser output is completed by adopting single resonant cavity oscillation in an experimental optical path, when the laser output with the average power of 100 watts and the peak power of 600 watts is realized, the temperature of the thulium optical fiber is up to 50-60 ℃, the average power or the peak power is continuously improved, the main welding spot can be burnt out, and the system can dissipate heat in a mode of cooling by air and water besides air.
The embodiment of the invention comprises the following steps: the same thulium optical fiber as in the comparative example is adopted for experiments, the experimental light path adopts the oscillator module 100, the beam splitter module 200, the amplifier module 300, the beam combiner module 400 and the coupling module 500 which are sequentially connected with each other along the transmission direction of laser signals to finish laser output, when 150W average power and 750W peak power laser output are realized, the highest temperature of thulium optical fiber of each amplifying stage is not more than 35 ℃, the system can ensure heat dissipation balance only by air cooling, a water cooling system with larger set volume is avoided, and the stability and reliability of the system are ensured.
In a specific embodiment of the present invention, the beam splitter module 200 may be a 1x7 optical power beam splitter, the amplifier module 300 includes 6 amplifiers 310, the continuous laser power output by the oscillator module 100 is about 10 watts, the laser power input to each amplifier 310 after beam splitting by the beam splitter exceeds 1 watt, the pulse laser output by each amplifier 310 is greater than 33 watts, the 6 amplifiers 310 are respectively connected with the input end of the beam combiner module 400, and the average power output by the output end of the beam combiner module 400 can reach more than 188 watts.
It should be noted that, the parallel amplifiers 310 may work independently, and any one of the amplifiers 310 may be turned off independently after being failed or damaged, so that the operation of the other amplifiers 310 is not affected, and the fiber laser may continue to complete operations or experiments; in addition, the amplifier module 300 at least includes two parallel amplifiers 310, and the reflected light amplified by the amplifier module 300 is divided into at least two paths, so that the influence of the reflected light on the optical path and related devices is weakened, and the stability and reliability of the laser system are ensured.
Compared with the fiber laser with the linear structure in the prior art, the embodiment of the invention improves the average power and the peak power of laser output, avoids heat concentration, is easy to manage in heat dissipation, and improves the stability and the reliability of the system; and each module adopts an independently packaged modularized structure, so that the complexity of laser integration is reduced, and the method is beneficial to batch production and production cost reduction.
Referring to fig. 2, in the embodiment of the present invention, along the transmission direction of the laser signal, the oscillator module 100 includes a first grating 110, a first gain fiber 120, a first beam combiner assembly 130 and a second grating 140, which are sequentially connected to each other, the first beam combiner assembly 130 includes a first beam combiner 131 and a first pump source 141, an input end of the first beam combiner 131 is connected to the first gain fiber 120, an output end of the first beam combiner 131 is connected to an input end of the second grating 140, and a pump input end of the first beam combiner 131 is connected to the first pump source 141, wherein the pump signal direction of the first pump source 141 is opposite to the output direction of the laser signal, and a reflectivity of the first grating 110 is greater than that of the second grating 140.
In a specific embodiment of the present invention, the first beam combiner 131 may be a (2+1) ×1 pump beam combiner, the number of the first pump sources 141 is two, the two first pump sources 141 are used as reverse pump light and are respectively connected to the pump input ends of the first beam combiner 131, the signal input end of the first beam combiner 131 is connected to the first gain optical fiber 120, and the signal output end of the first beam combiner 131 is connected to the input end of the second grating 140.
It should be noted that, the first grating 110 is a high reflection grating, the second grating 140 is a low reflection grating, the first grating 110 and the second grating 140 have filtering effects, and the first grating 110 and the second grating 140 form an oscillation cavity mirror of the oscillation module.
In an embodiment of the present invention, the core diameter of the first gain fiber 120 is optionally between 6 μm and 10 μm, and the cladding diameter of the first gain fiber 120 is between 80 μm and 130 μm. To ensure pump absorption by the oscillator module 100, the length of the first gain fiber 120 is between 4m and 6m.
In the prior art, a 790nm thulium fiber laser is adopted, a linear structure is adopted, the heat loss of the thulium fiber is more than 50%, the heat loss of the laser is about 55%, and in order to obtain pulse laser with the average power of 150W and 2 mu m, the waste heat power generated by a laser system is about 525W. In the fiber laser according to the embodiment of the invention, the oscillator module 100 adopts a small-sized optical fiber, so that on one hand, the preparation difficulty of the optical fiber and related devices such as a beam combiner and a beam splitter is reduced, the international supply chain dependency on the optical fiber is reduced, and the cost of the optical fiber and related devices is saved compared with the fiber laser with a linear structure adopted in the prior art under the condition of meeting the requirement of certain output power.
It should be noted that, the first gain fiber 120 may be a single-clad thulium-doped fiber, a double-clad thulium-doped fiber, or a multi-clad thulium-doped fiber, and in this embodiment of the present invention, preferably, the first gain fiber 120 is a double-clad thulium-doped fiber.
Preferably, the core diameter of the first gain fiber 120 is 10 μm, the cladding diameter of the first gain fiber 120 is 130 μm, and the length of the first gain fiber 120 is 5m.
Referring to fig. 2, in an embodiment of the present invention, the oscillator module 100 further includes a first isolator module 150, where the first isolator module 150 is disposed between the output end of the second grating 140 and the input end of the beam splitter module 200, and the first isolator module 150 only allows the laser light to pass through the passive optical device in one direction based on the non-reciprocity of faraday rotation.
In this embodiment of the present invention, one of the output ends of the beam splitter is connected to a first laser power monitoring unit 201 for monitoring the laser intensity in the oscillator module 100 or for monitoring whether there is a laser output in the oscillator module 100, so that when it is detected that the oscillator module has no laser output, a power-off protection measure is adopted for the fiber laser to prevent burning out the machine.
Specifically, the first laser power monitoring part 201 may be a photodiode.
In the embodiment of the present invention, the included angle between the end face of the optical fiber connected to the end of the first grating 110 far from the first gain optical fiber 120 and the transmission direction of the laser signal is between 3 ° and 10 °, so as to avoid the reflected light from returning to the original optical path along the direction opposite to the transmission direction of the laser signal, and the optical path is adversely affected, preferably, the included angle is 8 °.
Referring to fig. 3, in the embodiment of the present invention, along the transmission direction of the laser signal, the amplifier 310 includes a second beam combiner assembly 320, a second gain optical fiber 330 and a cladding light stripper 340 that are sequentially connected to each other, the second beam combiner assembly 320 includes a second beam combiner 321 and at least two second pump sources 322, each second pump source 322 is respectively connected to a pump input end of the second beam combiner 321, an input end of the second beam combiner 321 is connected to an output end of the beam splitter module 200, an output end of the second beam combiner 321 is connected to the second gain optical fiber 330, and an output end of the cladding light stripper 340 is connected to an input end of the beam combiner module 400, wherein the pump signal direction of the second pump source 322 is the same as the output direction of the laser signal.
The cladding light stripper 340 is used to strip the excess cladding pump light and the cladding laser light.
In the fiber laser provided by the embodiment of the invention, each amplifier 310 adopts the same second pump source 322, the beam combination correlation is good, and the high power output of the fiber laser is realized through the beam combination.
Referring to fig. 3, in an embodiment of the present invention, the amplifier 310 includes a second combiner assembly 320, a second gain fiber 330, and a cladding stripper 340, which are sequentially connected to each other, and the second combiner assembly 320 includes a second combiner 321 and six second pump sources 322, and the six second pump sources 322 are forward pump sources.
In the embodiment of the present invention, the core diameter of the second gain fiber 330 is between 10 μm and 30 μm, and the cladding diameter of the second gain fiber 330 is between 80 μm and 130 μm. To ensure pump absorption by the amplifier 310, the second gain fiber 330 has a length between 4m and 6m.
Preferably, the core diameter of the second gain fiber 330 is 15 μm, the cladding diameter of the second gain fiber 330 is 130 μm, and the length of the second gain fiber 330 is 5m.
The amplifier module 300 in the fiber laser of the embodiment of the invention adopts the small-sized optical fiber, on one hand, under the condition of meeting the requirement of certain output power, compared with the fiber laser with a linear structure adopted in the prior art, the preparation difficulty of the optical fiber and related devices is reduced, the international supply chain dependency degree of the optical fiber is reduced, and the cost of the optical fiber and related devices is saved; on the other hand, the heat effect generated by adopting the large-core optical fiber in the prior art is dispersed in a plurality of small-core optical fibers, so that the heat concentration is avoided, the heat dissipation efficiency is improved, the heat dissipation is easy to manage, and the manufacturing difficulty and the manufacturing cost of the optical fiber laser are reduced.
Referring to fig. 3, in the embodiment of the present invention, the output end of the cladding light stripper 340 is connected to a second laser power monitoring component 350 for monitoring the laser intensity in any one of the amplifiers 310 or for monitoring whether there is a laser output in any one of the amplifiers 310, so that when it is monitored that any one of the amplifiers 310 has no laser output, the amplifier 310 is independently turned off, and the rest of the amplifiers 310 work normally.
In particular, the second laser power monitoring part 350 may be a photodiode.
In the embodiment of the present invention, the amplifier module 300 further includes a waste light recycling unit 360 for recycling the cladding pump light and the cladding laser light stripped by the cladding light stripper 340, and the waste light recycling unit 360 is connected in parallel with each amplifier 310 and connected to the input end of the combiner module 400.
Referring to fig. 4, in the embodiment of the present invention, the coupling module 500 includes a housing 510 provided with an incident light port 501 and an outgoing light port 502, and along the transmission direction of the laser signal, the coupling module 500 includes a mirror group 520 and a focusing lens 530 located in the housing 510, where the mirror group 520 is configured to: the laser beam received from the incident light port 501 and output via the output end of the beam combiner module 400 is reflected to the focusing lens 530 and output via the emergent light port 502.
The focusing lens 530 converges the laser light to the end face of the optical fiber, thereby improving the coupling efficiency of the optical path.
Therefore, in the coupling module 500 in the fiber laser provided by the embodiment of the invention, the reflecting mirror group 520 and the focusing lens 530 are arranged, so that the transmission direction of the laser signal is changed, and the laser signal is output through the focusing lens 530, and the coupling efficiency of the optical path is improved; in addition, the size of the coupling module 500 may be reduced, thereby reducing the size of the fiber laser.
Referring to fig. 4, in the embodiment of the present invention, the mirror group 520 includes a first mirror 521 and a second mirror 522 spaced apart from the first mirror 521, the first mirror 521 is configured to receive the laser light entering from the incident light port 501 and output through the output end of the beam combiner module 400, and the second mirror 522 is configured to receive the laser light reflected by the first mirror 521 and reflect the laser light to the focusing lens 530.
Referring to fig. 4, in the embodiment of the present invention, the coupling module 500 includes a third laser power monitoring 570 disposed in the housing 510, and the third laser power monitoring 570 is disposed on a side of the second mirror 522 away from the first mirror 521, for monitoring the intensity of the laser light transmitted through the second mirror 522 or for monitoring whether the laser light is transmitted through the second mirror 522.
In particular, the third laser power monitoring 570 component may be a photodiode.
Referring to fig. 4, in a specific embodiment of the present invention, the first mirror 521 and the second mirror 522 may be disposed in parallel; preferably, the first reflecting mirror 521 and the second reflecting mirror 522 are both disposed at 45 ° to the laser light incident direction, so that the space of the coupling module 500 is more compact.
In the embodiment of the present invention, the coupling module 500 further includes an explosion-proof screen 540 located in the housing 510, where the explosion-proof screen 540 is disposed between the focusing lens 530 and the light exit 502, and the explosion-proof screen 540 is used for protecting the focusing lens 530 and playing a role in dust prevention and pollution prevention on the laser output light path.
Referring to fig. 4, in an embodiment of the present invention, the coupling module 500 further includes a shutter 550 positioned within the housing 510, the shutter 550 being configured to: for blocking the optical path of the laser signal transmission or deviating from the optical path of the laser signal transmission. So set up, when laser closes the back, shutter 550 removes to the light path of laser signal transmission in shelter from the light, avoids the unexpected opening of laser, and the laser of mistake play hurts the human body.
In a specific embodiment of the present invention, shutter 550 is capable of blocking the optical path between second mirror 522 and focusing lens 530.
Specifically, the shutter 550 includes a light blocking member and a driving member, wherein the driving member is drivingly connected to one end of the light blocking member, and the other end of the light blocking member is used for blocking the optical path of the laser signal transmission or deviating from the optical path of the laser signal transmission.
The driving means of the driving member may be a motor, and may be an artificial foot switch or a manual driving switch.
Referring to fig. 4, in the embodiment of the present invention, the coupling module 500 further includes a second isolator module 560 located in the housing 510, the second isolator module 560 is connected to the output end of the beam combiner module 400, and the laser light output from the output end of the beam combiner module 400 is isolated by the second isolator module 560 and collimated light is incident on the first mirror 521.
It should be noted that, during the use of the fiber laser, when the fiber laser is powered on, the oscillator module 100 is powered on, and if the first laser power monitoring unit 201 monitors that there is laser in the oscillator module 100, the amplifier module 300 is powered on; when the power is turned off, the amplifier module 300 is powered off, and if the second laser power monitoring unit 350 monitors that no laser exists in the oscillator module 100, the power is turned off for the oscillator module 100, so that the damage of the second gain optical fiber 330 caused by the fact that the second gain optical fiber 330 of the amplifier 310 is not used for inputting the laser output by the oscillator module 100 is prevented.
Referring to fig. 5, a second aspect of the embodiment of the present invention provides a light output control method of an optical fiber laser, which is applied to the optical fiber laser, where the light output control method of the optical fiber laser includes:
at a first time t 1 The control system enable signal is high;
at a second time t 2 The switching signal of the oscillator module 100 is controlled to be high level;
at a third time t 3 The shutter 550 of the control coupling module 500 switches the signal high;
at a fourth time t 4 The switching signal of the control amplifier module 300 is high;
wherein the second time t 2 Later than the first time t 1 Third time t 3 Later than the second time t 2 Fourth time t 4 Later than the third time t 3 。
Therefore, in the light output control method of the fiber laser provided by the embodiment of the invention, the order of the enabling signal of the control system, the switching signal of the oscillator module 100, the switching signal of the optical gate 550 of the coupling module 500 and the switching signal of the amplifier module 300 to be high is set, so that the damage of the second gain fiber 330 caused by the second gain fiber 330 of the amplifier 310 when no laser output by the oscillator module 100 is input is prevented, and the stable operation of the fiber laser is ensured.
In the embodiment of the present invention, the output end of the beam splitter module 200 is connected to the first laser power monitoring component 201, and the method further includes:
The first laser power monitoring part 201 monitors that there is a laser output in the oscillator module 100. So controlled, the second gain fiber 330 of the amplifier 310 is prevented from being damaged when no laser light output from the oscillator module 100 is input, and stable operation of the fiber laser is ensured.
See the attachedFIG. 5, in a specific embodiment of the invention, the second time t 2 And a fourth time t 4 The absolute value of the time difference between the two is larger than or equal to a first preset time T 1 . Second time t 2 The oscillator module 100 is controlled to power up to provide a pump source for the first gain fiber 120 at a fourth time t 4 The amplifier module 300 is controlled to supply power to the second gain fiber 330 to provide a pump source, so that a minimum time difference exists between the power supply time of the first pump source 141 and the power supply time of the second pump source 322, i.e. a first preset time T, in order to prevent the gain fiber from being damaged when no seed light is input to the amplifier stage 1 . In one embodiment, in the light output control method, a timing control module of the power supply drive of the pump source is configured, and the timing control module provides a clock signal for the power supply drive of the pump source, so that the power-on interval time t of the power-on signal of the first pump source 141 is sent, and then the power-on signal of the second pump source 322 is sent.
Preferably, the first preset time T 1 The value of (2) is 5ms, so that the power-on interval time t is greater than or equal to 5ms, and in the interval time, the oscillator module 100 obtains enough time to generate seed light and transmit the seed light to the amplifier module 300, so as to ensure the stable operation of the fiber laser.
Referring to fig. 5, in an embodiment of the present invention, the light output control method of the fiber laser further includes:
at a fifth time t 5 The control system enable signal is low;
at a sixth time t 6 The switching signal of the control amplifier module 300 is low;
at the seventh time t 7 The shutter 550 of the control coupling module 500 switches the signal low;
at the eighth time t 8 The switching signal of the oscillator module 100 is controlled to be low;
wherein the fifth time t 5 Later than the fourth time t 4 Sixth time t 6 Later than the fifth time t 5 Seventh time t 7 Later than the sixth time t 6 Eighth time t 8 Later than the seventh moment t 7 。
Therefore, in the light output control method of the fiber laser provided by the embodiment of the invention, the order of the enabling signal of the control system, the switching signal of the oscillator module 100, the switching signal of the optical gate 550 of the coupling module 500 and the switching signal of the amplifier module 300 are set to be low level is set, on one hand, the damage of the second gain fiber 330 caused by the second gain fiber 330 of the amplifier 310 when no laser output by the oscillator module 100 is input is prevented, and the stable operation of the fiber laser is ensured; on the other hand, when the switching signal of the amplifier module 300 is at low level, the switching signal of the optical shutter 550 is at low level, and the optical shutter 550 moves to the optical path of the laser signal transmission to shield the light, so as to avoid the accidental opening of the laser and the hurt of the human body by the misoutput laser.
In an embodiment of the present invention, a second laser power monitoring unit (350) is connected to each of the amplifiers (310), and further includes, between the sixth time and the eighth time:
the second laser power monitoring component (350) monitors no laser output in the amplifier (310). So controlled, the second gain fiber 330 of the amplifier 310 is prevented from being damaged when no laser light output from the oscillator module 100 is input, and stable operation of the fiber laser is ensured.
Referring to fig. 5, in a specific embodiment of the present invention, a sixth time t 5 And eighth time t 8 The time difference is greater than or equal to a second preset time T 2 . Sixth time t 5 The control amplifier module 300 is powered down, i.e. the second pump source 322 is powered down, at eighth time t 8 To prevent the gain fiber damage caused by the amplifier stage when no seed light is input, the oscillator module 100 is controlled to be powered down, i.e. the first pump source 141 is powered down, so that there is a minimum time difference between the power down time of the second pump source 322 and the power down time of the first pump source 141, i.e. a second preset time T 2 . In one embodiment, in the light output control method, a timing control module of the power supply drive of the pump source is configured, and the timing control module provides a clock signal for the power supply drive of the pump source to enable a power-down interval time t for sending a power-down signal of the second pump source 322 0 After that, the first pumping source is sent141, power down.
Preferably, the second preset time T 2 Takes a value of 5ms, so that the power-down interval time t 0 And 5ms or more, the amount of pump generated by the second pump source 322 can be consumed during the interval, so as to avoid damage to the gain fiber caused by the amplifier stage when no seed light is input.
Referring to fig. 5, in an embodiment of the present invention, the light output control method of the fiber laser further includes: at a sixth time t 6 When the switching signal input by the user is at the low level, the switching signal of the amplifier module 300 is simultaneously controlled to be at the low level.
The switch signal input by the user is a manual switch signal or a foot switch signal, when the manual switch is pressed or the foot switch is stepped on, the switch signal input by the user is at a high level, otherwise, when the manual switch is released or the foot switch is released, the switch signal input by the user is at a low level.
Referring to fig. 5, in an embodiment of the present invention, the light output control method of the fiber laser further includes: the switching signal input by the user is at a high level at a ninth time, which is between the second time and the third time.
Specifically, at a first time t 1 The control system enable signal is high;
At a second time t 2 The switching signal of the oscillator module 100 is controlled to be high level;
at the ninth time t 9 The switching signal input by the user is at a high level;
at a third time t 3 The shutter 550 of the control coupling module 500 switches the signal high;
at a fourth time t 4 The switching signal of the control amplifier module 300 is high.
Since the shutter 550 needs a reaction time to switch between a light blocking position blocking the optical path of the laser signal transmission and a light transmitting position deviating from the optical path of the laser signal transmission, the shutter 550 operates for a time period longer than the switching signal input by the user.
Referring to fig. 5, in an embodiment of the present invention, the light output control method of the fiber laser further includes:
at tenth time t 10 If the switching signal input by the user is at a low level, the switching signal of the amplifier module 300 is simultaneously controlled to be at a low level;
at the eleventh time t 11 The shutter 550 of the coupling module 500 switches the signal low;
at the twelfth time t 12 The switching signal input by the user is at a high level;
at thirteenth time t 13 The shutter 550 of the coupling module 500 switches the signal high;
at the fourteenth time t 14 The switching signal of the control amplifier module 300 is high;
Wherein the eleventh time t 11 Later than the tenth time t 10 Twelfth time t 12 Later than the eleventh time t 11 Thirteenth time t 13 Later than the twelfth time t 12 Fourteenth time t 14 Later than thirteenth time t 13 And at tenth time t 10 To the fourteenth time t 14 Are all between the third time t 3 And eighth time t 8 Between them.
In the fiber laser provided by the embodiment of the invention, during the period that the system enabling signal and the switching signal of the oscillator module 100 are at high level, the switching signal of the amplifier module 300 can be controlled to be at high level or low level at any time based on the switching signal input by a user, namely, the laser output or closing of the amplifier module 300 can be controlled at any time.
In an embodiment of the present invention, before the step of controlling the system enable signal to be at the high level at the first time, the method further includes: the system state is ready.
In the embodiment of the present invention, when the system state is not ready or the system enable signal is low, the shutter 550 is controlled to switch the signal to low.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention, and the scope of the invention should be assessed accordingly to that of the appended claims.
Claims (15)
1. The fiber laser is characterized in that an oscillator module (100), a beam splitter module (200), an amplifier module (300), a beam combiner module (400) and a coupling module (500) which are connected with each other are sequentially arranged along the transmission direction of laser signals, the amplifier module (300) comprises at least two amplifiers (310) which are connected in parallel, the input end of each amplifier (310) is connected with the output end of the beam splitter module (200), and the output end of each amplifier (310) is connected with the input end of the beam combiner module (400); and the oscillator module (100), the beam splitter module (200), the amplifier module (300), the combiner module (400), and the coupling module (500) are all packaged independently.
2. The fiber laser according to claim 1, wherein the oscillator module (100) comprises a first grating (110), a first gain fiber (120), a first combiner assembly (130) and a second grating (140) connected to each other in sequence along a transmission direction of the laser signal, the first combiner assembly (130) comprises a first combiner (131) and a first pump source (141), an input of the first combiner (131) is connected to the first gain fiber (120), an output of the first combiner (131) is connected to an input of the second grating (140), and a pump input of the first combiner (131) is connected to the first pump source (141), wherein a pump signal direction of the first pump source (141) is opposite to an output direction of the laser signal, and a reflectivity of the first grating (110) is greater than a reflectivity of the second grating (140).
3. The fiber laser of claim 2, wherein the amplifier (310) comprises a second combiner assembly (320), a second gain fiber (330) and a cladding stripper (340) connected to each other in sequence along a transmission direction of the laser signal, the second combiner assembly (320) comprising a second combiner (321) and at least two second pump sources (322), each second pump source (322) being connected to a pump input of the second combiner (321), an input of the second combiner (321) being connected to an output of the beam splitter module (200), an output of the second combiner (321) being connected to the second gain fiber (330), an output of the cladding stripper (340) being connected to an input of the combiner module (400), wherein a pump signal direction of the second pump source (322) is the same as the output direction of the laser signal.
4. A fiber laser according to claim 3, characterized in that the core diameter of the first gain fiber (120) is between 6 μm and 10 μm, the cladding diameter of the first gain fiber (120) is between 80 μm and 130 μm, and the length of the first gain fiber (120) is between 4m and 6m;
And/or the core diameter of the second gain fiber (330) is between 10 μm and 30 μm, the cladding diameter of the second gain fiber (330) is between 80 μm and 130 μm, and the length of the second gain fiber (330) is between 4m and 6m.
5. A fiber laser according to claim 3, wherein the amplifier module (300) further comprises a waste light recovery unit (360) for recovering the cladding pump light and the cladding laser light stripped by the cladding light stripper (340), the waste light recovery unit (360) being connected in parallel with each of the amplifiers (310) and connected to an input of the combiner module (400).
6. A fiber laser according to claim 3, characterized in that the coupling module (500) comprises a housing (510) provided with an entrance light port (501) and an exit light port (502), the coupling module (500) comprising a mirror group (520) and a focusing lens (530) located within the housing (510) in the transmission direction of the laser signal, the mirror group (520) being configured to: the laser beam output by the output end of the beam combiner module (400) entering from the incident light port (501) is reflected to the focusing lens (530) and output by the emergent light port (502).
7. The fiber laser of claim 6, wherein the mirror group (520) comprises a first mirror (521) and a second mirror (522) spaced apart from the first mirror (521), the first mirror (521) being configured to receive the laser light entering from the incident light port (501) and output via the output of the combiner module (400), the second mirror (522) being configured to receive the laser light reflected by the first mirror (521) and reflect to the focusing lens (530);
the coupling module (500) further comprises an explosion-proof screen (540) positioned in the shell (510), wherein the explosion-proof screen (540) is arranged between the focusing lens (530) and the emergent light port (502);
and/or the coupling module (500) further comprises a shutter (550) located within the housing (510), the shutter (550) being configured to block or deviate from the optical path of the laser signal transmission.
8. The fiber laser of claim 7, wherein the oscillator module (100) further comprises a first isolator module (150), the first isolator module (150) being disposed between the output of the second grating (140) and the input of the beam splitter module (200); and/or the number of the groups of groups,
The coupling module (500) further comprises a second isolator module (560) located in the shell (510), the second isolator module (560) is connected to the output end of the beam combiner module (400), and laser light output by the output end of the beam combiner module (400) is isolated by the second isolator module (560) and output collimated light is incident to the first reflecting mirror (521).
9. The fiber laser according to claim 7, wherein the output of one of the beam splitter modules (200) is connected to a first laser power monitoring means (201) for monitoring the laser intensity in the oscillator module (100) or for monitoring whether there is a laser output in the oscillator module (100);
the output end of the cladding light stripper (340) is connected with a second laser power monitoring component (350) for monitoring the laser intensity in any one of the amplifiers (310) or monitoring whether the laser output exists in any one of the amplifiers (310);
and/or the coupling module (500) comprises a third laser power monitoring (570) component arranged in the shell (510), wherein the third laser power monitoring (570) component is positioned on one side of the second reflecting mirror (522) away from the first reflecting mirror (521) and is used for monitoring the laser intensity transmitted through the second reflecting mirror (522) or monitoring whether laser transmits through the second reflecting mirror (522).
10. A light output control method of a fiber laser, characterized in that it is applied to the fiber laser according to any one of claims 1 to 9, and the light output control method of the fiber laser comprises:
controlling the system enable signal to be high at a first time;
controlling the switching signal of the oscillator module (100) to be high at a second moment;
-controlling a shutter switching signal of the coupling module (500) to a high level at a third moment in time, the coupling module (500) comprising a shutter (550), the shutter switching signal being configured for controlling the shutter (550) to block or deviate from an optical path of the laser signal transmission;
controlling the switching signal of the amplifier module (300) to be high at a fourth time;
wherein the second time is later than the first time, the third time is later than the second time, and the fourth time is later than the third time.
11. The method for controlling the light output of the fiber laser according to claim 10, wherein the output end of the beam splitter module (200) is connected to a first laser power monitoring component (201), and further comprising, between the first time and the third time:
The first laser power monitoring component (201) monitors that there is a laser output in the oscillator module (100).
12. The method for controlling light output of a fiber laser according to claim 10, further comprising:
controlling the system enable signal to be low at a fifth moment;
controlling a switching signal of the amplifier module (300) to be low at a sixth time; or, when the switching signal input by the user at the sixth moment is at a low level, simultaneously controlling the switching signal of the amplifier module (300) to be at a low level;
controlling a shutter (550) switching signal of the coupling module (500) to be low at a seventh timing;
controlling a switching signal of the oscillator module (100) to be low at an eighth time; wherein the fifth time is later than the fourth time, the sixth time is later than the fifth time, the seventh time is later than the sixth time, and the eighth time is later than the seventh time.
13. The method for controlling the light output of a fiber laser according to claim 12, wherein each of the amplifiers (310) is connected to a second laser power monitoring unit (350), and further comprising, between the sixth time and the eighth time:
The second laser power monitoring component (350) monitors no laser output in the amplifier (310).
14. The method for controlling light output of a fiber laser of claim 12, further comprising: the switching signal input by the user is at a high level at a ninth time, and the ninth time is between the second time and the third time.
15. The method for controlling light output of a fiber laser of claim 12, further comprising:
at the tenth moment, if the switching signal input by the user is at a low level, simultaneously controlling the switching signal of the amplifier module (300) to be at a low level;
at an eleventh time, a shutter (550) of the coupling module (500) switches a signal to a low level;
at the twelfth moment, the switching signal input by the user is at a high level;
the shutter (550) of the coupling module (500) switches the signal high at thirteenth moment;
controlling a switching signal of the amplifier module (300) to be high level at a fourteenth timing;
wherein the eleventh time is later than the tenth time, the twelfth time is later than the eleventh time, the thirteenth time is later than the twelfth time, the fourteenth time is later than the thirteenth time, and the tenth to fourteenth times are all between the third and eighth times.
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| CN117335256A (en) * | 2023-12-01 | 2024-01-02 | 上海频准激光科技有限公司 | Optical signal power control system |
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