CN114204393A - Optical fiber laser - Google Patents
Optical fiber laser Download PDFInfo
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- CN114204393A CN114204393A CN202111558251.8A CN202111558251A CN114204393A CN 114204393 A CN114204393 A CN 114204393A CN 202111558251 A CN202111558251 A CN 202111558251A CN 114204393 A CN114204393 A CN 114204393A
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 137
- 239000000835 fiber Substances 0.000 claims abstract description 138
- 238000005086 pumping Methods 0.000 claims abstract description 52
- 230000008878 coupling Effects 0.000 claims abstract description 5
- 238000010168 coupling process Methods 0.000 claims abstract description 5
- 238000005859 coupling reaction Methods 0.000 claims abstract description 5
- 238000005253 cladding Methods 0.000 claims description 44
- 230000003287 optical effect Effects 0.000 claims description 24
- 230000004927 fusion Effects 0.000 claims description 12
- 230000010355 oscillation Effects 0.000 claims description 9
- 238000010586 diagram Methods 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 239000004065 semiconductor Substances 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
- H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
- H01S3/06712—Polarising fibre; Polariser
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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
- H01S3/0675—Resonators including a grating structure, e.g. distributed Bragg reflectors [DBR] or distributed feedback [DFB] 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
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
- H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
- H01S3/094003—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light the pumped medium being a fibre
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Abstract
The invention provides a fiber laser. The optical fiber laser comprises a seed light source and an optical fiber amplifier, wherein the seed light source comprises a total reflector, an optical fiber resonant cavity, a first beam combiner and a first output device which are sequentially connected, the input end of the first beam combiner is connected with a first pumping source, the optical fiber resonant cavity is used for outputting laser, the total reflector is used for reflecting the first pumping light left after the optical fiber resonant cavity receives the first pumping light to the optical fiber resonant cavity, and the first output device is used for outputting laser; the first output device is connected with the optical fiber amplifier, the optical fiber amplifier comprises a second beam combiner, a second gain optical fiber and a second output device which are sequentially connected, the input end of the second beam combiner is connected with a second pumping source, the second pumping source is used for generating second pumping light, the second beam combiner is used for coupling the second pumping light to the second gain optical fiber, the second gain optical fiber is used for forming laser, and the second output device is used for outputting the laser. The scheme can improve the reliability and the beam quality of the fiber laser.
Description
Technical Field
The invention relates to the technical field of lasers, in particular to a fiber laser.
Background
At present, a traditional fiber laser adopts a resonant cavity formed by a high-low reflection grating and an active fiber to directly output laser under the action of pump light. When the output power of the fiber laser is high, the fiber laser can generate heat seriously, and the beam quality of laser can be worsened, so that the reliability of the fiber laser is poor, namely, the traditional fiber laser cannot continuously and stably output the laser with high power and high beam quality, and the market demand of the traditional fiber laser cannot be met.
Disclosure of Invention
The main objective of the present invention is to provide a fiber laser, which aims to improve the reliability of the fiber laser, reduce the heat generated when the fiber laser outputs laser, and improve the beam quality of the laser output by the fiber laser.
To achieve the above object, the present invention provides a fiber laser, including:
the seed light source comprises a total reflector, an optical fiber resonant cavity, a first beam combiner and a first output device which are sequentially connected, wherein the optical fiber resonant cavity comprises a first optical fiber grating, a first gain optical fiber and a second optical fiber grating which are sequentially connected, the input end of the first beam combiner is connected with a first pumping source, the optical fiber resonant cavity is used for receiving first pumping light generated by the first pumping source so as to form laser oscillation and output laser to the first output device, the total reflector is used for reflecting the first pumping light left after the optical fiber resonant cavity receives the first pumping light to the optical fiber resonant cavity, and the first output device is used for outputting the laser generated by the optical fiber resonant cavity; and
the output end of the first output device is connected with the input end of the optical fiber amplifier, the optical fiber amplifier comprises a second beam combiner, a second gain optical fiber and a second output device which are sequentially connected, the input end of the second beam combiner is connected with a second pumping source, the second pumping source is used for generating second pumping light, the second beam combiner is used for coupling the second pumping light to the second gain optical fiber, the second gain optical fiber is used for absorbing the second pumping light to form laser and output the laser to the second output device, and the second output device is used for outputting the laser generated by the second gain optical fiber.
In an embodiment, the optical fiber laser further includes an indication optical module, the indication optical module is coupled to an input end of the optical fiber amplifier, the indication optical module is configured to generate indication light, and the indication light enters the optical fiber amplifier and is output through the second output device.
In an embodiment, the indication light module includes an indication light source and a wavelength division multiplexer, an input end of the wavelength division multiplexer is connected with an output end of the first output device, an output end of the wavelength division multiplexer is connected with an input end of the second beam combiner, the indication light source is connected with an input end of the wavelength division multiplexer, and the wavelength division multiplexer is configured to optically couple the indication light output by the indication light source into the optical fiber amplifier.
In an embodiment, the optical fiber amplifier further includes a mode field matcher, an input end of the mode field matcher is connected to an output end of the indication optical module, an output end of the mode field matcher is connected to an input end of the second beam combiner, and the mode field matcher is configured to reduce power loss of the laser output by the first output device entering the second beam combiner.
In an embodiment, a reflection band of the total reflection mirror is the same as a band of the first pump light generated by the first pump source.
In an embodiment, the first output device includes a first cladding pump stripper and an isolator, the first beam combiner, the first cladding pump stripper and the isolator are sequentially connected, and an output end of the isolator is connected with an input end of the optical fiber amplifier.
In an embodiment, the first output device further includes a first photodiode, the first photodiode is disposed on an outer wall of a fusion splice of optical fibers between the first cladding pump stripper and the isolator, and the first photodiode is configured to collect an optical signal of laser output by the first cladding pump stripper of an optical fiber cladding at the fusion splice.
In an embodiment, the second output device includes a second cladding pump stripper and a laser output head, the second gain fiber, the second cladding pump stripper and the laser output head are sequentially connected, and the laser output head is configured to output laser passing through the second cladding pump stripper.
In an embodiment, the second output device further includes a second photodiode, the second photodiode is disposed on an outer wall of a fusion splice of the optical fiber between the second cladding pump stripper and the laser output head, and the second photodiode is configured to collect an optical signal of the laser output by the second cladding pump stripper of the optical fiber cladding at the fusion splice.
In one embodiment, the output end face of the laser output head is plated with an anti-reflection film.
The optical fiber laser comprises a seed light source and an optical fiber amplifier, wherein the seed light source comprises a total reflector, an optical fiber resonant cavity, a first beam combiner and a first output device which are connected in sequence, the input end of the first beam combiner is connected with a first pumping source, the optical fiber resonant cavity comprises a first optical fiber grating, a first gain optical fiber and a second optical fiber grating which are connected in sequence, namely, the seed light source forms a forward and reverse double-end pumping structure by arranging the total reflector and the first beam combiner, the optical fiber resonant cavity is used for receiving first pumping light generated by the first pumping source to form laser oscillation and output laser to the first output device, the total reflector is used for reflecting the first pumping light left after the optical fiber resonant cavity receives the first pumping light to the optical fiber resonant cavity, the first output device is used for outputting the laser generated by the optical fiber resonant cavity, and the output end of the first output device is connected with the input end of the optical fiber amplifier, the optical fiber amplifier comprises a second beam combiner, a second gain optical fiber and a second output device which are connected in sequence, wherein the second output device is used for outputting laser generated by the second gain optical fiber, so that high-power laser output can be realized, in the process, first pump light generated by a first pump source firstly passes through the optical fiber resonant cavity to form laser, and the rest part of the first pump light which is not completely received by the optical fiber resonant cavity can be reflected to the optical fiber resonant cavity by a total reflector to form laser again, so that the first pump light generated by the first pump source can be fully utilized by the optical fiber resonant cavity to form laser, and the utilization rate of converting the first pump light into the laser is improved. Compare with traditional fiber laser, when the laser of high power is exported to needs, traditional fiber laser turns into the pumping light utilization ratio of laser lower relatively, and high power laser can cause fiber laser to generate heat seriously when the oscillation in the fiber resonator, fiber laser generates heat and seriously can further reduce the utilization ratio that the pumping light turned into the laser, the light beam quality that still can lead to the laser that sends simultaneously is relatively poor, thereby influence fiber laser's stability, and fiber laser of this scheme has avoided the high power oscillation of laser, thereby can solve the problem that current fiber laser generates heat seriously and the laser beam quality of output is poor when exporting the laser of high power, and then the reliability of fiber laser has been improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of an embodiment of a fiber laser of the present invention;
FIG. 2 is a schematic diagram of the seed light source of FIG. 1;
FIG. 3 is a schematic diagram of the fiber amplifier of FIG. 1;
fig. 4 is a schematic diagram showing a specific structure of the fiber laser in fig. 1.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| 100 | |
200 | |
| 110 | |
210 | Second beam combiner |
| 120 | Optical |
220 | Second gain |
| 121 | |
230 | |
| 122 | First gain |
231 | Second |
| 123 | |
232 | |
| 130 | First beam combiner | 233 | |
| 140 | |
240 | |
| 141 | First |
250 | Mould |
| 142 | |
300 | Indication light module |
| 143 | A |
310 | Indicating |
| 150 | |
320 | Wavelength division multiplexer |
The objects, features and advantages of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The invention provides a fiber laser.
Referring to fig. 1 to 3, in an embodiment of the fiber laser of the present invention, the fiber laser includes a seed light source 100 and a fiber amplifier 200, the seed light source 100 includes a total reflection mirror 110, a fiber resonator 120, a first beam combiner 130 and a first output device 140 connected in sequence, the fiber cavity 120 includes a first fiber grating 121, a first gain fiber 122 and a second fiber grating 123 connected in sequence, the input end of the first beam combiner 130 is connected to a first pump source 150, the fiber resonator 120 is configured to receive a first pump light generated by the first pump source 150, to form laser oscillation and output laser light to the first output device 140, the total reflection mirror 110 is configured to reflect the first pump light remaining after the fiber resonator 120 receives the first pump light to the fiber resonator 120, the first output device 140 is used for outputting the laser light generated by the fiber resonator 120; the output end of the first output device 140 is connected to the input end of the optical fiber amplifier 200, the optical fiber amplifier 200 includes a second beam combiner 210, a second gain fiber 220, and a second output device 230, which are connected in sequence, the input end of the second beam combiner 210 is connected to a second pump source 240, the second pump source 240 is configured to generate second pump light, the second beam combiner 210 is configured to couple the second pump light to the second gain fiber 220, the second gain fiber 220 is configured to absorb the second pump light to form laser and output the laser to the second output device 230, and the second output device 230 is configured to output the laser generated by the second gain fiber 220.
It can be understood that the seed light source 100 in this embodiment is also called a linear cavity fiber laser seed source, and the structural schematic diagram is shown in fig. 2, and fig. 2 adopts a linear straight cavity optical path structure. The first pumping source 150 may be a semiconductor laser, the fiber resonator 120 includes a first fiber grating 121, a first gain fiber 122, and a second fiber grating 123, which are connected in sequence, the first beam combiner 130 is connected in series to an output end of the second fiber grating 123 and an input end of the first output device 140, at this time, the fiber resonator is a reverse single-ended pumping, meanwhile, one end of the first fiber grating 121 is further connected to the total reflector 110, the total reflector 110 can reflect the first pumping light that is not completely received by the fiber resonator 120 into the fiber resonator 120, so that the first pumping light that is not completely converted into laser continues to oscillate in the fiber resonator 120 to form laser, that is, the total reflector 110 and the fiber resonator 120 form a forward single-ended pumping structure, and the seed light source 100 in this scheme is a forward and reverse double-ended pumping structure in combination with the aforementioned reverse single-ended pumping structure. One end of the total reflector 110 facing the first fiber grating 121 is provided with a reflective film, the reflective film can reflect a predetermined wavelength band, and the predetermined wavelength band is the same as a wavelength band of the first pump light generated by the first pump source 150, so that the total reflector 110 can reflect the first pump light, and the conversion rate of converting the first pump light into laser light is improved.
Further, the first gain fiber 122 may be a thulium-doped double-clad fiber, one end of the first fiber grating 121 is connected to the holophote 110, the other end of the first fiber grating 121 is connected to the first gain fiber 122, the first gain fiber 122 may be an active fiber, one end of the second fiber grating 123 is connected to the first gain fiber 122, and the other end of the second fiber grating 123 is connected to the first beam combiner 130. The laser light output by the first output device 140 is signal light, and the optical fiber amplifier 200 is used for performing power amplification on the injected laser light to realize high-power laser light output.
The optical fiber laser of the present invention includes a seed light source 100 and an optical fiber amplifier 200, the seed light source 100 includes a total reflection mirror 110, an optical fiber resonant cavity 120, a first beam combiner 130 and a first output device 140, which are connected in sequence, an input end of the first beam combiner 130 is connected with a first pumping source 150, the optical fiber resonant cavity 120 includes a first optical fiber grating 121, a first gain fiber 122 and a second optical fiber grating 123, which are connected in sequence, that is, by arranging the total reflection mirror 110 and the first beam combiner 130, the seed light source 100 forms a forward and reverse double-end pumping structure, the optical fiber resonant cavity 120 is used for receiving a first pumping light generated by the first pumping source 150 to form laser oscillation and output laser to the first output device 140, the total reflection mirror 110 is used for reflecting the first pumping light left after the optical fiber resonant cavity 120 receives the first pumping light to the optical fiber resonant cavity 120, the first output device 140 is used for outputting laser generated by the optical fiber resonant cavity 120, the output end of the first output device 140 is connected to the input end of the optical fiber amplifier 200, the optical fiber amplifier 200 includes a second beam combiner 210, a second gain fiber 220 and a second output device 230, which are connected in sequence, the second output device 230 is used for outputting laser generated by the second gain fiber 220, so that high-power laser output can be achieved, in this process, first pump light generated by the first pump source 150 first passes through the optical fiber resonator 120 to form laser, and the remaining portion of the first pump light, which is not completely received by the optical fiber resonator 120, is reflected to the optical fiber resonator 120 by the holophote 110 to form laser again, so that the first pump light generated by the first pump source 150 can be fully utilized by the optical fiber resonator 120 to form laser, thereby improving the utilization rate of converting the first pump light into laser. Compare with traditional fiber laser, when the laser of high power is exported to needs, traditional fiber laser turns into the pumping light utilization ratio of laser lower relatively, and high power laser can cause fiber laser to generate heat seriously when the oscillation in the fiber resonator, fiber laser generates heat and seriously can further reduce the utilization ratio that the pumping light turned into the laser, the light beam quality that still can lead to the laser that sends simultaneously is relatively poor, thereby influence fiber laser's stability, and fiber laser of this scheme has avoided the high power oscillation of laser, thereby can solve the problem that current fiber laser generates heat seriously and the laser beam quality of output is poor when exporting the laser of high power, and then the reliability of fiber laser has been improved.
Referring to fig. 3 and 4, in an embodiment, the optical fiber laser further includes an indication optical module 300, the indication optical module 300 is coupled to an input end of the optical fiber amplifier 200, the indication optical module 300 is configured to generate indication light, and the indication light enters the optical fiber amplifier 200 and is output through the second output device 230. It can be understood that the indication light module 300 can generate indication light, and the indication light is coupled to the optical fiber amplifier 200, so that the laser output by the second output device 230 further includes the indication light, and the indication light can facilitate debugging the laser, thereby improving the safety of laser debugging. Meanwhile, the indicator light is coupled to the input end of the optical fiber amplifier 200, which can reduce the loss of the indicator light relative to the coupling of the indicator light to the seed light source 100; and the indicating light is added before the optical fiber amplifier 200 amplifies the power of the laser, so that the influence of the indicating light on the signal light can be reduced, namely, the indicating light module 300 is coupled with the input end of the optical fiber amplifier 200, so that the indicating light and the signal light can be considered simultaneously, the mutual influence and loss of the indicating light and the signal light are small, and the reliability of the optical fiber laser is improved.
In an embodiment, the indication light module 300 includes an indication light source 310 and a wavelength division multiplexer 320, an input end of the wavelength division multiplexer 320 is connected to an output end of the first output device 140, an output end of the wavelength division multiplexer 320 is connected to an input end of the second beam combiner 210, the indication light source 310 is connected to an input end of the wavelength division multiplexer 320, and the wavelength division multiplexer 320 is configured to couple the indication light output by the indication light source 310 into the optical fiber amplifier 200. So set up, through setting up wavelength division multiplexer 320 for instruct the stable coupling of light in second beam combiner 210, thereby guaranteed that the laser that fiber laser sent can be convenient for adjust, thereby improved fiber laser's reliability.
Referring to fig. 3 and 4, in an embodiment, the optical fiber amplifier 200 further includes a mode field matcher 250, an input end of the mode field matcher 250 is connected to an output end of the indication optical module 300, an output end of the mode field matcher 250 is connected to an input end of the second beam combiner 210, and the mode field matcher 250 is configured to reduce a power loss of the laser output by the first output device 140 entering the second beam combiner 210. It can be understood that the optical fiber used in the optical fiber amplifier 200 is a double-clad optical fiber, the core diameter of the optical fiber used by the indication optical module 300 is smaller than the core diameter of the optical fiber used by the second combiner 210, and the mode field matcher 250 is used to reduce the power loss of the laser light output by the first output device 140 entering the second combiner 210, that is, by providing the mode field matcher 250, when the laser light enters a larger core diameter of the optical fiber from a smaller core diameter of the optical fiber, the mode field matcher 250 reduces the power loss of the laser light, thereby implementing the low-loss transition of the laser light from a thin optical fiber to a thick optical fiber, and thus improving the reliability of the optical fiber laser.
In an embodiment, the reflection band of the total reflection mirror 110 is the same as the band of the first pump light generated by the first pump source 150. The arrangement is such that the total reflection mirror 110 can completely reflect the first pump light generated by the first pump source 150 into the fiber cavity 120, thereby being beneficial to increasing the utilization rate of converting the first pump light into laser light. For example, the wavelength band generated by the first pump light is 793nm, and the wavelength band that the total reflection mirror 110 can reflect is 793 nm; for another example, the wavelength band generated by the first pump light is 976nm, and the wavelength band that can be reflected by the total reflection mirror 110 is 976nm, which is not limited herein.
Referring to fig. 2 and 4, in an embodiment, the first output device 140 includes a first cladding pump stripper 141 and an isolator 142, the first beam combiner 130, the first cladding pump stripper 141 and the isolator 142 are sequentially connected, and an output end of the isolator 142 is connected to an input end of the optical fiber amplifier 200.
It is understood that the first cladding pump stripper 141 is used to filter out cladding light in the light output from the first beam combiner 130 to improve the beam quality of the laser. The input end of the isolator 142 is connected to the output end of the first cladding pump stripper 141, and the output end of the isolator 142 is connected to the input end of the optical fiber amplifier 200, so as to prevent backward laser in the optical fiber amplifier 200 from entering the seed light source 100, and reduce the adverse effect of reflected light on the stability of laser output power, and optionally, the isolation degree of the isolator 142 is higher than 95%. By the arrangement, the reliability of the optical fiber laser is ensured.
In an embodiment, the first output device 140 further includes a first photodiode 143, the first photodiode 143 is disposed on an outer wall of a fiber fusion splice between the first cladding pump stripper 141 and the isolator 142, and the first photodiode 143 is configured to collect an optical signal of the laser output by the first cladding pump stripper 141 of the fiber cladding at the fusion splice. It can be understood that the first photodiode 143 can collect an optical signal of the laser output by the first cladding pump stripper 141, and convert the optical signal into an electrical signal, and the electrical signal controls the seed light source 100, that is, controls the first pump source 150, through the formation of voltage, and when the first photodiode 143 detects the optical signal, it indicates that a device of the seed light source 100 is in operation; when the first photodiode 143 does not detect the optical signal, which indicates that one or more devices of the seed light source 100 are damaged, the first pump source 150 needs to be turned off, so that the first pump source 150 stops emitting the pump light, so as to protect the devices of the seed light source 100 and the fiber amplifier 200, thereby improving the reliability of the fiber laser.
Referring to fig. 3 and 4, in an embodiment, the second output device 230 includes a second cladding pump stripper 231 and a laser output head 232, the second gain fiber 220, the second cladding pump stripper 231, and the laser output head 232 are sequentially connected, and the laser output head 232 is configured to output laser passing through the second cladding pump stripper 231. It is understood that the second gain fiber 220 may be an active fiber, and the second cladding pump stripper 231 is used to filter cladding light out of the light output from the second gain fiber 220 to improve the beam quality of the laser. The laser output head 232 is configured to output the laser after passing through the second cladding pump stripper 231, so as to output the high-power laser, thereby implementing a function of outputting the high-power laser.
In an embodiment, the second output device 230 further includes a second photodiode 233, the second photodiode 233 is disposed on an outer wall of a fiber fusion splice between the second cladding pump stripper 231 and the laser output head 232, and the second photodiode 233 is configured to collect an optical signal of laser output by the second cladding pump stripper 231 of a fiber cladding at the fusion splice. It can be understood that the second photodiode 233 can collect an optical signal of the laser output by the second cladding pump stripper 231, and convert the optical signal into an electrical signal, and the electrical signal controls the optical fiber amplifier 200 through the formation of voltage, that is, controls the second pump source 240, and when the second photodiode 233 detects the optical signal, it indicates that the device of the optical fiber amplifier 200 is in operation; when the second photodiode 233 does not detect the optical signal, which indicates that one or more devices of the optical fiber amplifier 200 are damaged, the second pump source 240 needs to be turned off, so that the second pump source 240 stops emitting the second pump light to protect the devices of the optical fiber amplifier 200, thereby improving the reliability of the optical fiber laser.
In an embodiment, when the first photodiode 143 and the second photodiode 233 are triggered, the second pumping source 240 is turned off, and then the first pumping source 150 is turned off, so as to protect the fiber laser.
In one embodiment, the output end face of the laser output head 232 is plated with an anti-reflection film. It can be understood that the anti-reflection film can perform total reflection on the external light, so that the external light cannot enter the fiber amplifier 200 along the output end of the laser output head 232, thereby preventing the external light from affecting the internal devices of the fiber laser.
Referring to fig. 4, in an embodiment of the optical fiber laser, the power of the first pump light output by the first pump source 150 in the seed light source 100 is 10W, the wavelength is 793nm, the pump light fiber of the first pump source 150 is a single-clad fiber of 105/125, the fiber of the first beam combiner 130 is a fiber beam combiner of 1+1 × 1, the signal fiber is a double-clad fiber of 10/130, the first gain fiber 122 is a thulium-doped double-clad fiber of 10/130, and the fibers adopted by the total reflection mirror 110, the first fiber grating 121, the second fiber grating 123, the first clad pump stripper 141, and the isolator 142 are all double-clad fibers of 10/130. The first pump light with power of 10W and wavelength of 793nm is output from the isolator 142 after passing through the above device, and becomes laser light with power of 2W and wavelength of 2 μm.
Further, in the optical fiber amplifier 200, the power of the second pump light output by the second pump light is 50W, the number of the second pump light is 6, the wavelengths of the second pump light are all 793nm, the pump light fiber of the second pump source 240 is a double-clad fiber of 25/400, the fiber of the second beam combiner 210 is a double-clad fiber of 25/400, the second gain fiber 220 is a thulium-doped double-clad fiber of 25/400, and the fibers adopted by the second cladding pump stripper 231 and the laser output head 232 are both double-clad fibers of 25/400; the optical fiber adopted by the connection of the wavelength division multiplexer 320 and the mode field matcher 250 is 10/130 double-clad optical fiber, the optical fiber adopted by the connection of the mode field matcher 250 and the second beam combiner 210 is 25/400 double-clad optical fiber, that is, the mode field matcher 250 realizes the transition from 10/130 double-clad optical fiber to 25/400 double-clad optical fiber; the power of the indicating light emitted from the indicating light source 310 was 15mW and the wavelength was 532 nm.
Further, the power output by the seed light source 100 is 2W, the laser with the wavelength of 2 μm is input into the optical fiber amplifier 200, and is combined with the optical fiber amplifier 200, so that the laser power output from the laser output head 232 is 100W, and the laser with the wavelength of 2 μm, thereby realizing high power output of the laser, and the quality of the beam emitted by the optical fiber laser is good, and the heat generation amount is less compared with that of the conventional optical fiber laser, so that the reliability of the optical fiber laser of the present scheme is high.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A fiber laser, comprising:
the seed light source comprises a total reflector, an optical fiber resonant cavity, a first beam combiner and a first output device which are sequentially connected, wherein the optical fiber resonant cavity comprises a first optical fiber grating, a first gain optical fiber and a second optical fiber grating which are sequentially connected, the input end of the first beam combiner is connected with a first pumping source, the optical fiber resonant cavity is used for receiving first pumping light generated by the first pumping source so as to form laser oscillation and output laser to the first output device, the total reflector is used for reflecting the first pumping light left after the optical fiber resonant cavity receives the first pumping light to the optical fiber resonant cavity, and the first output device is used for outputting the laser generated by the optical fiber resonant cavity; and
the output end of the first output device is connected with the input end of the optical fiber amplifier, the optical fiber amplifier comprises a second beam combiner, a second gain optical fiber and a second output device which are sequentially connected, the input end of the second beam combiner is connected with a second pumping source, the second pumping source is used for generating second pumping light, the second beam combiner is used for coupling the second pumping light to the second gain optical fiber, the second gain optical fiber is used for absorbing the second pumping light to form laser and output the laser to the second output device, and the second output device is used for outputting the laser generated by the second gain optical fiber.
2. The fiber laser of claim 1, further comprising an indication light module coupled to an input of the fiber amplifier, the indication light module configured to generate an indication light, the indication light entering the fiber amplifier and being output via the second output device.
3. The fiber laser of claim 2, wherein the indication light module includes an indication light source and a wavelength division multiplexer, an input of the wavelength division multiplexer is connected with an output of the first output device, an output of the wavelength division multiplexer is connected with an input of the second combiner, the indication light source is connected with an input of the wavelength division multiplexer, and the wavelength division multiplexer is configured to optically couple an indication light output by the indication light source into the fiber amplifier.
4. The fiber laser of claim 2, wherein the fiber amplifier further includes a mode field matcher, an input of the mode field matcher is connected to an output of the indication light module, an output of the mode field matcher is connected to an input of the second beam combiner, and the mode field matcher is configured to reduce power loss of the laser light output by the first output device entering the second beam combiner.
5. The fiber laser of claim 1, wherein a reflection band of the total reflection mirror is the same as a band of the first pump light generated by the first pump source.
6. The fiber laser of claim 1, wherein the first output means comprises a first cladding pump stripper and an isolator, the first combiner, the first cladding pump stripper and the isolator being connected in series, an output of the isolator being connected to an input of the fiber amplifier.
7. The fiber laser of claim 6, wherein the first output means further comprises a first photodiode disposed on an outer wall of a fiber fusion splice between the first cladding pump stripper and the isolator, the first photodiode being configured to collect an optical signal of the laser output by the first cladding pump stripper of the fiber cladding at the fusion splice.
8. The fiber laser of claim 1, wherein the second output device includes a second cladding pump stripper and a laser output head, the second gain fiber, the second cladding pump stripper and the laser output head are connected in sequence, and the laser output head is configured to output the laser after passing through the second cladding pump stripper.
9. The fiber laser of claim 8, wherein the second output means further comprises a second photodiode disposed on an outer wall of a fiber fusion splice between the second cladding pump stripper and the laser output head, the second photodiode being configured to collect an optical signal of the laser output from the second cladding pump stripper of the fiber cladding at the fusion splice.
10. The fiber laser of claim 8, wherein an output end face of the laser output head is plated with an antireflection film.
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| CN106159655A (en) * | 2016-08-19 | 2016-11-23 | 深圳市镭神智能系统有限公司 | A kind of optical fiber laser |
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| CN212935126U (en) * | 2020-06-10 | 2021-04-09 | 苏州创鑫激光科技有限公司 | Laser device |
| CN216981121U (en) * | 2021-12-17 | 2022-07-15 | 深圳泰德激光技术股份有限公司 | Optical fiber laser |
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| CN106099630A (en) * | 2016-08-10 | 2016-11-09 | 中国工程物理研究院激光聚变研究中心 | A kind of optical fiber laser and laser generation method |
| CN106159655A (en) * | 2016-08-19 | 2016-11-23 | 深圳市镭神智能系统有限公司 | A kind of optical fiber laser |
| CN212935126U (en) * | 2020-06-10 | 2021-04-09 | 苏州创鑫激光科技有限公司 | Laser device |
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