CN107293930B - Integrated high-power all-fiber laser - Google Patents
Integrated high-power all-fiber laser Download PDFInfo
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- CN107293930B CN107293930B CN201610203099.4A CN201610203099A CN107293930B CN 107293930 B CN107293930 B CN 107293930B CN 201610203099 A CN201610203099 A CN 201610203099A CN 107293930 B CN107293930 B CN 107293930B
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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
- H01S3/06704—Housings; Packages
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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
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Abstract
An integrated high-power all-fiber laser is characterized in that the left end of a first all-fiber device (1) is connected with the upper end of a first gain fiber (51) through a first melting point (61); the lower end of the first gain fiber (51) is connected with the left end of the second all-fiber device (2) through a second melting point (62); the right end of the second all-fiber device (2) is connected with the upper end of the second gain fiber (52) through a third melting point (63); the lower end of the second gain fiber (52) is connected with the right end of the third all-fiber device (3) through a fourth melting point (64); the left end of the third all-fiber device (3) is connected with the right end of the third gain fiber (53) through a fifth melting point (65); the left end of the third gain fiber (53) is connected with the right end of the fourth all-fiber device (4) through a sixth melting point (66). The invention has the advantages of compact structure, high reliability, easy integration, few welding points, short length of used optical fiber, high nonlinear threshold value and the like compared with the traditional all-fiber laser.
Description
Technical Field
The invention discloses an integrated high-power all-fiber laser, belongs to the field of lasers, and particularly belongs to the field of high-power all-fiber lasers.
Background
High-power all-fiber lasers are widely used in the fields of industrial processing, national defense and military, medical treatment and the like in recent years due to the excellent characteristics of good beam quality, high conversion efficiency, good heat dissipation and the like. With the continuous expansion of the application field of high-power fiber lasers, the requirements on the output power and the beam quality of the fiber laser are higher and higher. For example, in the manufacturing industry of automobiles, airplanes and large ships, the output power of the optical fiber laser reaches kilowatt level or even kilowatt level when the thick metal plate is processed by laser forming, welding, cutting and the like.
However, in the manufacture of high-power fiber lasers, the power level of the current commercialized single fiber laser is in the kilowatt level, which is restricted by factors such as the bearing capacity of high-power fiber devices, the processing technology of welding points, the power level of high-brightness pump sources, the overall integration level and the like. Currently, only a few companies can produce 2kW or more of commercial fiber lasers, and only a few foreign companies master the preparation technology of high-power all-fiber devices, such as ITF of canada. There are also only a few foreign companies that have mastered the technology for making such high power, high performance optical fibers, such as Nufern, CorActive corporation.
The high-power all-fiber laser is manufactured by welding a gain fiber and all-fiber devices to form an integral structure, wherein all-fiber devices are various and comprise fiber gratings, beam combiners, cladding light filters, high-power end caps and the like. The commercial high-power all-fiber devices are manufactured and sold relatively separately, and all the devices need to be welded and connected when the high-power fiber laser is manufactured, so that a high-power fiber system comprises a resonant cavity and a plurality of amplification stages, the melting points are more, and in the high-power fiber laser above the kilowatt level, the heating of all the melting points needs to be protected by a cooling device. And the tail fiber of each all-fiber device is 1-2 m in length, and the matching of the numerical aperture and the fiber diameter of the tail fiber of each device needs to be considered when the device is selected. Therefore, the length of the transmission fiber of the fiber laser is increased, the threshold value of the nonlinear effect is reduced, the integration level of the fiber laser is reduced, meanwhile, the melting point fusion welding needs a higher process level, and the fiber core and the fiber diameter are precisely aligned. And each all-fiber device is provided with a corresponding cooling protection device in the high-power fiber laser, so that the volume of the high-power all-fiber laser is increased.
Disclosure of Invention
The invention aims to provide an integrated high-power all-fiber laser to solve the problems in the technical background and the technical defects of the conventional high-power all-fiber device.
An integrated high-power all-fiber laser is characterized in that,
the left end of the first all-fiber device 1 is connected with the upper end of the first gain fiber 51 through a first melting point 61;
the lower end of the first gain fiber 51 is connected with the left end of the second all-fiber device 2 through a second melting point 62;
the right end of the second all-fiber device 2 is connected with the upper end of the second gain fiber 52 through a third melting point 63;
the lower end of the second gain fiber 52 is connected to the right end of the third all-fiber device 3 through a fourth melting point 64;
the left end of the third all-fiber device 3 is connected with the right end of the third gain fiber 53 through a fifth melting point 65;
the left end of the third gain fiber 53 is connected to the right end of the fourth all-fiber device 4 through a sixth melting point 66.
The first all-fiber device 1 comprises a first fiber grating 11, a first pump beam combiner 12 and a plurality of pump arms of the first pump beam combiner 12;
the second all-fiber device 2 includes a second fiber grating 21, a second pump beam combiner 22, and a plurality of pump arms of the second pump beam combiner 22; also included are a first cladding filter 24, a third pump combiner 23, and a plurality of pump arms of the third pump combiner 23.
The third all-fiber device 3 includes a fourth pump combiner 31 and a plurality of pump arms of the fourth pump combiner 31; a second cladding light filter 32 is also included.
The fourth all-fiber device 4 includes a third cladding light filter 41 and an end cap 42.
The first gain fiber 51, the second gain fiber 52 and the third gain fiber 53 are all rare-earth doped double-clad fibers.
The first all-fiber device 1 is an integrated all-fiber device, and the total signal fiber length is less than 0.5 m; the first fiber grating 11 is a high-power high-reflection grating, has a reflectivity of more than 97% to the central wavelength of laser, and bears laser power of more than 2 kW; the first pumping beam combiner 12 is an Nx 1 type forward pumping beam combiner, and the power transmittance of pumping light is more than 92%; the pumping arms of the first pumping beam combiner 12 are packaged and can be used for directly performing plug-pull connection on the semiconductor laser, each pumping arm bears pumping light power higher than 400W, and N is more than or equal to 4 and less than or equal to 20;
the signal fibers of the first fiber grating 11 and the first pump combiner 12 are made of the same fiber, and the fiber diameter and the numerical aperture parameter are consistent with those of the first gain fiber 51.
The total signal optical fiber length is less than 1 m; the second fiber grating 21 is a high-power low-reflectivity fiber, has reflectivity of 5-20% to the central wavelength of the laser, and can bear laser power of more than 2 kW; the second pump beam combiner 22 is an (N +1) × 1 type reverse pump beam combiner, and the power transmittance of the pump light is greater than 90%; the pumping arms of the second pumping beam combiner 22 are packaged and can be used for directly performing plug-pull connection on the semiconductor laser, and each pumping arm can bear pumping light power higher than 200W; the pumping beam combiner 23 is an (N +1) x 1 type forward pumping beam combiner, and the power transmittance of the pumping light is more than 92%; the pumping arms of the pumping beam combiner 23 are packaged and can be used for directly performing plug-pull connection on the semiconductor laser, each pumping arm can bear pumping light power higher than 400W, and N is more than or equal to 4 and less than or equal to 10.
The capability of filtering the pump light in the cladding output by the resonant cavity is more than 400W; the second fiber grating 21, the signal fiber of the second pump beam combiner 22, the signal fiber of the third pump beam combiner 23 and the signal fiber of the first cladding optical filter 24 are made of the same fiber, the difference between the fiber diameter parameter and the fiber core of the second gain fiber 52 is not more than 15 μm, and the numerical aperture parameter is consistent.
According to the technical scheme, the invention has the beneficial effects that:
the integrated high-power all-fiber laser has the advantages of compact structure, high reliability, easiness in integration, few welding points, short used fiber length, high nonlinear threshold value and the like compared with the traditional all-fiber laser.
The integrated high-power all-fiber device can be assembled in a modularized mode, is convenient to maintain and assemble, and is connected with a semiconductor laser in a plug-in mode, so that the time cost of commercial production is reduced.
Drawings
FIG. 1 is a schematic view of the structure of the present invention.
Detailed Description
An integrated high-power all-fiber laser is characterized in that,
the left end of the first all-fiber device 1 is connected with the upper end of the first gain fiber 51 through a first melting point 61;
the lower end of the first gain fiber 51 is connected with the left end of the second all-fiber device 2 through a second melting point 62;
the right end of the second all-fiber device 2 is connected with the upper end of the second gain fiber 52 through a third melting point 63;
the lower end of the second gain fiber 52 is connected to the right end of the third all-fiber device 3 through a fourth melting point 64;
the left end of the third all-fiber device 3 is connected with the right end of the third gain fiber 53 through a fifth melting point 65;
the left end of the third gain fiber 53 is connected to the right end of the fourth all-fiber device 4 through a sixth melting point 66.
The first all-fiber device 1 comprises a first fiber grating 11, a first pump beam combiner 12 and a plurality of pump arms of the first pump beam combiner 12;
the second all-fiber device 2 includes a second fiber grating 21, a second pump beam combiner 22, and a plurality of pump arms of the second pump beam combiner 22; also included are a first cladding filter 24, a third pump combiner 23, and a plurality of pump arms of the third pump combiner 23.
The third all-fiber device 3 includes a fourth pump combiner 31 and a plurality of pump arms of the fourth pump combiner 31; a second cladding light filter 32 is also included.
The fourth all-fiber device 4 includes a third cladding light filter 41 and an end cap 42.
The first gain fiber 51, the second gain fiber 52 and the third gain fiber 53 are all rare-earth doped double-clad fibers.
The first all-fiber device 1 is an integrated all-fiber device, and the total signal fiber length is less than 0.5 m; the first fiber grating 11 is a high-power high-reflection grating, has a reflectivity of more than 97% to the central wavelength of laser, and bears laser power of more than 2 kW; the first pumping beam combiner 12 is an Nx 1 type forward pumping beam combiner, and the power transmittance of pumping light is more than 92%; the pumping arms of the first pumping beam combiner 12 are packaged and can be used for directly performing plug-pull connection on the semiconductor laser, each pumping arm bears pumping light power higher than 400W, and N is more than or equal to 4 and less than or equal to 20;
the signal fibers of the first fiber grating 11 and the first pump combiner 12 are made of the same fiber, and the fiber diameter and the numerical aperture parameter are consistent with those of the first gain fiber 51.
The total signal optical fiber length is less than 1 m; the second fiber grating 21 is a high-power low-reflectivity fiber, has reflectivity of 5-20% to the central wavelength of the laser, and can bear laser power of more than 2 kW; the second pump beam combiner 22 is an (N +1) × 1 type reverse pump beam combiner, and the power transmittance of the pump light is greater than 90%; the pumping arms of the second pumping beam combiner 22 are packaged and can be used for directly performing plug-pull connection on the semiconductor laser, and each pumping arm can bear pumping light power higher than 200W; the pumping beam combiner 23 is an (N +1) x 1 type forward pumping beam combiner, and the power transmittance of the pumping light is more than 92%; the pumping arms of the pumping beam combiner 23 are packaged and can be used for directly performing plug-pull connection on the semiconductor laser, each pumping arm can bear pumping light power higher than 400W, and N is more than or equal to 4 and less than or equal to 10.
The capability of filtering the pump light in the cladding output by the resonant cavity is more than 400W; the second fiber grating 21, the signal fiber of the second pump beam combiner 22, the signal fiber of the third pump beam combiner 23 and the signal fiber of the first cladding optical filter 24 are made of the same fiber, the difference between the fiber diameter parameter and the fiber core of the second gain fiber 52 is not more than 15 μm, and the numerical aperture parameter is consistent.
The present invention will be described in detail below with reference to the accompanying drawings. The structure schematic diagram of the integrated all-fiber laser of the present invention is shown in fig. 1. The laser is characterized in that a highly integrated all-fiber device is adopted, so that the whole fiber laser system only contains 4 all-fiber devices, 3 sections of gain fibers and 6 melting points, and the laser power output of more than 3kW can be realized. The integrated high-power all-fiber laser comprises: the all-fiber device comprises an all-fiber device 1, a gain fiber 51, an all-fiber device 2, a gain fiber 52, an all-fiber device 3, a gain fiber 53 and an all-fiber device 4, wherein all-fiber devices are connected with the gain fiber through melting points.
The all-fiber device 1 is connected to one end of the gain fiber 51 through a melting point 61. The all-fiber device 1 is an integrated device and comprises a fiber grating 11; the pump combiner 12, and the pump arm 101, the pump arm 102, … of the pump combiner 12 pump arm 10N. The total signal fiber length of the all-fiber device 1 is less than 0.5 m. The fiber grating 11 is a high-power high-reflection grating, has a reflectivity of more than 97% to the central wavelength of laser, and can bear laser power of more than 2 kW; the pumping beam combiner 12 is an Nx 1 type forward pumping beam combiner, and the power transmittance of pumping light is more than 92%; the pumping arms 101, 102, and … of the pumping beam combiner 12 are packaged and can be directly connected to the semiconductor laser in a plug-in manner, each pumping arm can bear pumping light power higher than 400W, the total bearing power is higher than 8000W, and N is higher than 4 and lower than 20. The fiber grating 11 and the signal fiber of the pump combiner 12 are made of the same fiber, and the fiber diameter and the numerical aperture parameter are consistent with those of the gain fiber 51. The fiber diameter of the integral signal fiber of the device can be 10/130 μm, 30/250 μm and 20/400 μm, the integral signal fiber is a passive energy transmission fiber, and the grid region of the grating 11 and the beam combining taper region of the pumping beam combiner 12 are protected by metal packaging.
And the other end of the gain optical fiber 51 is connected with one end of the all-fiber device 2 through a melting point 62, the gain optical fiber is a rare earth doped double-clad optical fiber, the fiber diameter parameter is consistent with the signal fiber parameter of the all-fiber device 1, and the fiber diameter can be 10/130 micrometers, 30/250 micrometers, 20/400 micrometers and the like. The core of the gain fiber 51 may be doped with laser active ions such as ytterbium and thulium, and the most common of high-power fiber lasers is doped with ytterbium ions.
And the other end of the all-fiber device 2 is connected with one end of the gain fiber 52 through a melting point 63. The optical fiber grating is an integrated all-fiber device and comprises an optical fiber grating 21; pump beam combiner 22, and pump arm 201, pump arm 202, … pump arm 20N of pump beam combiner 21; a cladding light filter 24; pump combiner 23, and pump arm 211, pump arm 212, … of pump combiner 23 pump arm 21N. The total signal fiber length is less than 1 m. The fiber grating 21 is a high-power low-reflectivity fiber, has reflectivity of 5-20% to the central wavelength of laser, and can bear laser power of more than 2 kW; the pumping beam combiner 22 is an (N +1) x 1 type reverse pumping beam combiner, and the power transmittance of pumping light is more than 90%; the pumping arms 201, 202 and … of the pumping beam combiner 21 are packaged and can directly connect the semiconductor laser in a plug-in manner, each pumping arm can bear pumping light power higher than 200W, the total bearing power is higher than 4000W, and N is higher than 4 and smaller than 10; the pumping beam combiner 23 is an (N +1) x 1 type forward pumping beam combiner, and the power transmittance of the pumping light is more than 92%; the pumping arm 211, the pumping arm 212, and the pumping arm … of the pumping beam combiner 23 are packaged and can be directly connected with the semiconductor laser in a plug-in manner, each pumping arm can bear pumping light power higher than 400W, the total bearing power is higher than 4000W, and N is higher than 4 and smaller than 10. The cladding light filter 24 can filter out the pumping light in the cladding output by the resonant cavity, and the filtering capacity is more than 400W; the fiber grating 21, the signal fiber of the pump beam combiner 22, the signal fiber of the pump beam combiner 23 and the signal fiber of the cladding light filter 24 are made of the same fiber, and the difference between the fiber diameter parameter and the fiber core of the gain fiber 52 is not more than 15 μm, and the numerical aperture parameter is consistent.
And the other end of the gain fiber 52 is connected with one end of the all-fiber device 3 through a melting point 64. The rare earth doped double-clad doped fiber has the fiber diameter parameter which can be different from the fiber core diameter of the signal fiber of the all-fiber device 2 by no more than 15 mu m, and the fiber diameters can be 30/250 mu m, 20/400 mu m, 25/400 mu m, 30/400 mu m and the like. The core of the gain fiber 52 may be laser active ions doped with ytterbium, thulium, etc.
The other end of the all-fiber device 3 is connected to the gain fiber 53 through a melting point 65. The integrated all-fiber device comprises a pumping beam combiner 31, a pumping arm 301 of the pumping beam combiner 31, a pumping arm 302, a pumping arm … and a pumping arm 30N; a cladding light filter 32. Wherein the pumping beam combiner 31 is an (N +1) x 1 type forward pumping beam combiner, and the power transmittance to pumping light is more than 92%; the pump arm 301 of the pump combiner 31, the pump arms 302, …, the pump arm 30N; the cladding light filter 32 is packaged and can be directly connected with the semiconductor laser in a plug-in manner, each pump arm can bear pump light power higher than 400W, and N is larger than 4 and smaller than 10. The cladding light filter 32 filters light transmitted in the cladding output by the first stage amplifier, and has a filtering capacity of more than 600W.
And a gain fiber 53, the other end of which is connected to one end of the all-fiber device 4 through a melting point 66. It is a rare earth doped double-clad gain fiber. The core diameter of the signal fiber of the optical fiber device 3 can be different from that of the signal fiber of the optical fiber device, and the core diameter can be 30/250 μm, 20/400 μm, 25/400 μm, 30/400 μm and the like. The core of the gain fiber 53 may be doped with laser active ions such as ytterbium and thulium.
The all-fiber device 4 is connected to the gain fiber 53 through a melting point 66, and the other end thereof is a laser output end. The total fiber length is less than 0.5m for an integrated output device. The cladding light filter 41 filters the cladding light of the second-stage amplifier, and the filtering capacity is greater than 800W; the end cap 42 is the output end of the laser, the output end face of the end cap is coated with a high antireflection film with laser wavelength, and the end cap is also a beam expanding device of the laser beam and can bear laser power larger than 10 kW.
The invention provides a high-power all-fiber laser with high integration level and low melting point. By adopting the all-fiber devices with high integration level, the melting point among all discrete all-fiber devices can be saved, the overall fiber length of the fiber laser is reduced, and the nonlinear threshold of the high-power fiber laser and the overall integration level of the fiber laser are improved. The high-power optical fiber laser is connected with the semiconductor laser in a plug-in mode, and modular assembly of the high-power optical fiber laser is achieved.
An integrated high-power all-fiber laser is characterized in that highly integrated all-fiber devices are adopted, the whole high-power all-fiber laser system only comprises 4 all-fiber devices, 3 sections of gain fibers, the number of melting points is only 6, and the laser power output of more than 3kW can be realized. A schematic diagram of a full fiber laser is shown in fig. 1, and the structure thereof includes:
an all-fiber device 1 connected to one end of the gain fiber 51 through a melting point 61;
a gain fiber 51, the other end of which is connected with one end of the all-fiber device 2 through a melting point 62;
an all-fiber device 2, the other end of which is connected with one end of the gain fiber 52 through a melting point 63;
a gain fiber 52, the other end of which is connected to one end of the all-fiber device 3 through a melting point 64;
an all-fiber device 3, the other end of which is connected with the gain fiber 53 through a melting point 65;
a gain fiber 53, the other end of which is connected to one end of the all-fiber device 4 through a melting point 66;
and the other end of the all-fiber device 4 is a laser output end.
The all-fiber device 1 comprises a fiber grating 11; the pump combiner 12, and the pump arm 101, the pump arm 102, … of the pump combiner 12 pump arm 10N.
The gain fiber 51 is a rare earth doped double-clad fiber.
The all-fiber device 2 is an integrated all-fiber device and comprises a fiber grating 21; pump beam combiner 22, and pump arm 201, pump arm 202, … pump arm 20N of pump beam combiner 21; a cladding light filter 24; pump combiner 23, and pump arm 211, pump arm 212, … of pump combiner 23 pump arm 21N.
The gain fiber 52 is a rare-earth doped double-clad fiber.
The all-fiber device 3 comprises a pump combiner 31, and a pump arm 301, a pump arm 302, and a pump arm … of the pump combiner 31, the pump arm 30N; a cladding light filter 32.
The gain fiber 53 is a rare earth doped double-clad fiber.
The all-fiber device 4 includes a cladding light filter 41 and an end cap 42.
The all-fiber device 1 is an integrated all-fiber device, and the total signal fiber length is less than 0.5 m. The fiber grating 11 is a high-power high-reflection grating, has a reflectivity of more than 97% to the central wavelength of laser, and can bear laser power of more than 2 kW; the pumping beam combiner 12 is an Nx 1 type forward pumping beam combiner, and the power transmittance of pumping light is more than 92%; the pumping arms 101, 102, … of the pumping beam combiner 12 are packaged and can be directly connected to the semiconductor laser in a plug-in manner, each pumping arm can bear pumping light power higher than 400W, wherein N is greater than or equal to 4 and less than or equal to 20. The fiber grating 11 and the signal fiber of the pump combiner 12 are made of the same fiber, and the fiber diameter and the numerical aperture parameter are consistent with those of the gain fiber 51.
The all-fiber device 2 is an integrated device, and the total signal fiber length is less than 1 m. The fiber grating 21 is a high-power low-reflectivity fiber, has reflectivity of 5-20% to the central wavelength of laser, and can bear laser power of more than 2 kW; the pumping beam combiner 22 is an (N +1) x 1 type reverse pumping beam combiner, and the power transmittance of the pumping light is greater than 90%; the pumping arm 201, the pumping arm 202 and the pumping arm … of the pumping beam combiner 22 are packaged and can be used for directly performing plug-pull connection on a semiconductor laser, and each pumping arm can bear pumping light power higher than 200W; the pumping beam combiner 23 is an (N +1) x 1 type forward pumping beam combiner, and the power transmittance of the pumping light is more than 92%; the pumping arm 211, the pumping arm 212 and the pumping arm … 21N of the pumping beam combiner 23 are packaged and can be directly connected with the semiconductor laser in a plug-pull manner, each pumping arm can bear pumping light power higher than 400W, and N is more than or equal to 4 and less than or equal to 10. The cladding light filter 24 can filter out the pumping light in the cladding output by the resonant cavity, and the filtering capacity is more than 400W; the fiber grating 21, the signal fiber of the pump beam combiner 22, the signal fiber of the pump beam combiner 23 and the signal fiber of the cladding light filter 24 are made of the same fiber, and the difference between the fiber diameter parameter and the fiber core of the gain fiber 52 is not more than 15 μm, and the numerical aperture parameter is consistent.
The all-fiber device 3 is an integrated device. The pumping beam combiner 31 is an (N +1) x 1 type forward pumping beam combiner, and the power transmittance of pumping light is more than 92%; the pump arm 301 of the pump combiner 31, the pump arms 302, …, the pump arm 30N; the cladding light filter 32 is packaged and can be directly connected with the semiconductor laser in a plug-in manner, and each pump arm can bear the pump light power higher than 400W, wherein N is more than or equal to 4 and less than or equal to 10. The cladding light filter 32 filters light transmitted in the cladding output by the first stage amplifier, and has a filtering capacity of more than 600W.
The all-fiber device 4 is an integrated output device, and the total fiber length is less than 0.5 m. The cladding light filter 41 filters the cladding light of the second-stage amplifier, and the filtering capacity is greater than 800W; the end cap 42 is the output end of the laser, the output end face of the end cap is coated with a high antireflection film with laser wavelength, and the end cap is also a beam expanding device of the laser beam and can bear laser power larger than 10 kW.
The invention discloses an integrated high-power all-fiber laser which is small in number of melting points, high in integration level and capable of realizing modular connection. And the threshold value of the nonlinear effect is improved, and the nonlinear effect of the kilowatt-level all-fiber laser is reduced to a certain extent. The integrated all-fiber device is adopted, so that the consistency of the fiber device is integrally ensured, and the stability of the high-power fiber laser can be improved.
The high-integration uniform all-fiber device is adopted, the function of the high-integration uniform all-fiber device is consistent with that of a discrete all-fiber device, the integration level is high, the high-integration uniform all-fiber device is prepared on the same optical fiber, the uniformity is good, an intermediate melting point is omitted, the length of the optical fiber is reduced, meanwhile, the damage threshold of the all-fiber device is also improved, and the fusion loss among all-fiber devices is reduced. And an integrated all-fiber device can use a cooling protection device, so that the cooling device of the whole system is integrated efficiently, and the volume of the high-power fiber laser is reduced.
The main core device of the invention is an all-fiber device with high integration level, wherein the all-fiber device 1 integrates the functions of a high-reflection fiber grating 11 of a resonant cavity and a forward pumping beam combiner 12 of the resonant cavity, and simultaneously, each pumping arm (101-10N) of the pumping beam combiner 12 adopts a packaged joint and can be directly connected with a high-power semiconductor laser in a plug-pull manner, so that a plurality of melting points between the pumping arm and the output tail fiber of the semiconductor laser are saved; the all-fiber device 2 realizes the functions of all discrete devices required between the resonant cavity and the first-stage amplification stage, integrates the functions of the low-reflection fiber grating 21 of the resonant cavity, the reverse pumping beam combiner 22 of the resonant cavity, the cladding light filter 24 of the resonant cavity for outputting laser and the forward pumping beam combiner 23 of the first-stage amplifier, can save three melting points, and can reduce the length of the optical fiber to be more than 5 meters; the all-fiber device 3 integrates the functions of a cladding light filter 32 for amplifying output light of the first stage and a forward pumping beam combiner 31 for amplifying output light of the second stage; the all-fiber device 4 includes a cladding light filter 41 for amplifying the output light of the second stage and an output end cap 42. The core devices are connected through three sections of gain optical fibers, so that the integrated high-power all-fiber laser can be realized.
The above-described embodiments of the present invention, which are further described in detail for the purpose of illustrating the invention, should be understood that the above-described embodiments are only illustrative of the present invention and are not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention. Furthermore, the above definitions of the various elements and methods are not limited to the particular structures, shapes or arrangements of parts mentioned in the examples, which may be easily modified or substituted by one of ordinary skill in the art, for example: the simple replacement of the position of the integrated all-fiber device in the present invention is within the protection scope of the present invention.
Claims (3)
1. An integrated high-power all-fiber laser is characterized in that,
the left end of the first all-fiber device (1) is connected with the upper end of the first gain fiber (51) through a first melting point (61);
the lower end of the first gain fiber (51) is connected with the left end of the second all-fiber device (2) through a second melting point (62);
the right end of the second all-fiber device (2) is connected with the upper end of the second gain fiber (52) through a third melting point (63);
the lower end of the second gain fiber (52) is connected with the right end of the third all-fiber device (3) through a fourth melting point (64);
the left end of the third all-fiber device (3) is connected with the right end of the third gain fiber (53) through a fifth melting point (65);
the left end of the third gain fiber (53) is connected with the right end of the fourth all-fiber device (4) through a sixth melting point (66);
the first all-fiber device (1) comprises a first fiber grating (11), a first pump beam combiner (12) and a plurality of pump arms of the first pump beam combiner (12);
the second all-fiber device (2) comprises a second fiber grating (21), a second pump beam combiner (22) and a plurality of pump arms of the second pump beam combiner (22); the multi-pump-arm optical fiber laser further comprises a first cladding light filter (24), a third pump beam combiner (23) and a plurality of pump arms of the third pump beam combiner (23);
the third all-fiber device (3) comprises a fourth pump beam combiner (31) and a plurality of pump arms of the fourth pump beam combiner (31); further comprising a second cladding light filter (32);
the fourth all-fiber device (4) comprises a third cladding light filter (41) and an end cap (42);
the first all-fiber device (1) is an integrated all-fiber device, and the total signal fiber length is less than 0.5 m; the first fiber grating (11) is a high-power high-reflection grating, has a reflectivity of more than 97% to the central wavelength of laser, and bears the laser power of more than 2 kW; the first pumping beam combiner (12) is an Nx 1 type forward pumping beam combiner, and the power transmittance of pumping light is more than 92%; a plurality of pumping arms of the first pumping beam combiner (12) are packaged and can be directly connected with the semiconductor laser in a plug-pull manner, each pumping arm bears pumping light power higher than 400W, and N is more than or equal to 4 and less than or equal to 20;
the second all-fiber device (2) is an integrated device, and the length of a total signal fiber is less than 1 m; the second fiber grating (21) is a high-power low-reflectivity fiber, has reflectivity of 5-20% to the central wavelength of laser, and can bear laser power of more than 2 kW; the second pumping beam combiner (22) is an (N +1) multiplied by 1 type reverse pumping beam combiner, and the power transmittance of the pumping light is more than 90 percent; a plurality of pumping arms of the second pumping beam combiner (22) are packaged and can be used for directly carrying out plug-in connection on the semiconductor laser, and each pumping arm can bear pumping light power higher than 200W; the pumping beam combiner (23) is an (N +1) multiplied by 1 type forward pumping beam combiner, and the power transmittance of the pumping light is more than 92 percent; a plurality of pumping arms of the pumping beam combiner (23) are packaged and can directly carry out plug-pull connection on the semiconductor laser, each pumping arm can bear pumping light power higher than 400W, and N is more than or equal to 4 and less than or equal to 10;
the first cladding light filter (24) has the capability of filtering the pump light in the cladding output by the resonant cavity, and the capability is more than 400W; the signal fiber of the second fiber grating (21), the signal fiber of the second pump combiner (22), the signal fiber of the third pump combiner (23) and the signal fiber of the first cladding light filter (24) are made of the same fiber, the difference between the fiber diameter parameter and the fiber core of the second gain fiber (52) is not more than 15 mu m, and the numerical aperture parameter is consistent;
2. an integrated high power all-fiber laser according to claim 1, wherein the first gain fiber (51), the second gain fiber (52) and the third gain fiber (53) are all rare-earth doped double-clad fibers;
3. an integrated high power all-fiber laser according to claim 1 or 2, wherein the signal fibers of the first fiber grating (11) and the first pump combiner (12) are made of the same fiber, and the fiber diameter and the numerical aperture parameters are consistent with those of the first gain fiber (51).
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