CN107623246B - Fiber core co-band pumping fiber laser - Google Patents
Fiber core co-band pumping fiber laser Download PDFInfo
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- CN107623246B CN107623246B CN201610555159.9A CN201610555159A CN107623246B CN 107623246 B CN107623246 B CN 107623246B CN 201610555159 A CN201610555159 A CN 201610555159A CN 107623246 B CN107623246 B CN 107623246B
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Abstract
A fiber core co-band pumping fiber laser is characterized by comprising a pumping module (01) and a resonant cavity module (02) amplification level module (03), wherein the pumping module (01) and the resonant cavity module (02) are welded in a low-loss mode, and the resonant cavity module (02) and the amplification level module (03) are welded in a low-loss mode; the high-power optical fiber laser comprises a pump module (01) and a pump module (1), wherein the pump module comprises a semiconductor laser (1), a semiconductor laser (2) and a … semiconductor laser N, N is less than or equal to 20, 30 pump beam combiners are N, N is (N +1) x 1 type, N is less than or equal to 20, and pump arms (20) of the pump beam combiners (30). The high-power optical fiber laser can achieve same-band pump amplification output of a fiber core in a large-mode-field double-clad optical fiber 1. same-band pump light and signal light can be generated in the same optical fiber without introduction of a coupling device 2. the structure is simple, 3, the scheme of the same-band pump optical fiber laser with the fiber core is simple, the integration level is high, and 4, the same-band pump amplification.
Description
Technical Field
The invention belongs to the field of laser, in particular to the technical field of high-power all-fiber laser.
Technical Field
The all-fiber laser has the advantages of compact structure, high integration level, excellent beam quality, high conversion efficiency, good heat dissipation performance and the like. Has wide application requirements in the industrial market and the national defense and military fields. As the demand for applications increases, the power requirements for fiber lasers also become higher and higher. The power output of fiber lasers directly pumped by semiconductor lasers is limited due to limitations of power and brightness of semiconductor lasers, thermal effects and nonlinear effects of the fibers and fiber devices themselves. In-band pumping is recognized as an effective way to boost the output power of a single-fiber laser. The method is characterized in that output light of a low-brightness semiconductor laser is converted into a high-brightness optical fiber laser, the optical fiber laser is used as a pumping source, and the brightness of the optical fiber laser under the same power is 2-3 orders of magnitude higher than that of the semiconductor laser. The same-band pump is a secondary pump and is therefore also called a cascade pump. The IPG single-fiber laser with the highest output power at present internationally is realized by a co-band pumping mode.
High power fiber lasers typically use ytterbium doped fiber as the gain medium, with conventional semiconductor lasers using wavelengths of 915nm and 975 nm. And its wavelength with the pump source is typically chosen to be 1018 nm. The absorption cross section of ytterbium ion at 1018nm is one order of magnitude lower than that of 976nm, so that the pumping gain of ytterbium ion at 1018nm wavelength is lower, the cladding absorption coefficient of 1018nm laser in large mode field double-clad fiber is low, the absorption of 1018nm laser is limited, the adopted gain fiber has long length requirement, and in high power fiber laser, the longer the adopted fiber length is, the lower the corresponding nonlinear effect threshold is. The absorption efficiency of ytterbium-doped double-cladding laser to 1018nm laser cladding is low, and a fiber core same-band pump can be adopted to improve the absorption efficiency of ytterbium particles to 1018nm laser, but most of the existing fiber core same-band pump structures are realized based on single-mode fibers or fibers with small mode fields, and are limited by the limitation of bearing power of a fiber core coupling device, the guided laser power can be in the level of several watts to dozens of watts, and the realization of high-power same-band pump amplification output is not facilitated.
Disclosure of Invention
The invention discloses a fiber core same-band pumping fiber laser which can realize high-power fiber core same-band pumping amplification output.
A fiber core co-band pumping fiber laser is characterized by comprising a pumping module 01 and a resonant cavity module 02 amplification level module 03, wherein the pumping module 01 and the resonant cavity module 02 are welded through low loss, and the resonant cavity module 02 and the amplification level module 03 are welded through low loss;
the pumping module 01 comprises a semiconductor laser 1, a semiconductor laser 2 and a semiconductor laser …, wherein N is less than or equal to 20; the number of the pump beam combiners is 30, and the pump beam combiners are N and are of a (N +1) x 1 type, wherein N is less than or equal to 20; the pumping arms 20 of the pumping beam combiner 30 are connected with the semiconductor lasers in a one-to-one low-loss welding mode through N (N is less than or equal to 20) in the same number, the oblique end face 61 is a signal fiber of the (N +1) x 1 type pumping beam combiner 30, and the angle of the end face is more than or equal to 5 degrees;
the resonant cavity module 02 comprises a high reflection grating 41 with the same pump light wavelength, a double-cladding doped fiber 51, a low reflection grating 42 with the same pump light wavelength, a signal light wavelength low reflection grating 43 and a cladding light filter 70;
the amplifier stage module 03 comprises a double-clad doped fiber 52, an output end cap 62;
the semiconductor laser 1 and the semiconductor laser 2 … are semiconductor lasers with the same parameters, N (N is less than or equal to 20), all the semiconductor lasers are provided with tail fiber output, the fiber diameter parameters of the output tail fibers are the same as those of the pumping arm 20 of the pumping beam combiner 30, and the numerical aperture of the output tail fibers of all the semiconductor lasers is not higher than that of the pumping arm 20; all the semiconductor lasers are connected with the pumping arm 20 of the pumping beam combiner 30 through low-loss welding with tail fibers, and the inside of each semiconductor laser can be single-tube coupling or target bar coupling.
The pumping beam combiner 30(N is less than or equal to 20) is of a (N +1) x 1 type, the single-arm bearing capacity of the pumping arm 20 of the pumping beam combiner 30 is more than or equal to 100W laser power, the signal fiber end face of the input end of the pumping beam combiner 30 is manufactured into an oblique end face 61, the end face is smooth, the end face angle is more than or equal to 5 degrees, the transmitted laser is prevented from Fresnel reflection to influence the stability of a resonant cavity of co-band pumping light, and the gains of the signal light and spontaneous radiation light are enhanced.
The input end of the same-band pump optical wavelength high-reflection grating 41 is connected with the output end signal fiber of the pump beam combiner 30 in the pump module 01 through low-loss fusion, and the output end of the same-band pump optical wavelength high-reflection grating is connected with one end of the double-clad doped fiber 51 through low-loss fusion. The reflectivity of the optical fiber to the same pump light wavelength is more than or equal to 99%, the fiber diameter parameter is consistent with the output end signal fiber of the pump beam combiner 30, the pump power which can be borne by the high-reflection grating 41 with the same pump light wavelength is more than or equal to 1000W, and the laser power which can be borne is more than or equal to 800W.
The double-cladding doped fiber 51 is an ytterbium-doped fiber, the other end of the double-cladding doped fiber is connected with the input end of the same-band pump light wavelength low-reflection grating 42 through low-loss fusion, the diameter of the fiber core of the double-cladding doped fiber is consistent with that of the tail fiber of the same-band pump light wavelength high-reflection grating 41, the inner cladding of the double-cladding doped fiber can be in a polygonal, quincunx, D-shaped and other structures, the diameter of the inner cladding is equivalent to that of the tail fiber of the same-band pump light wavelength low-reflection grating 42, the length of the inner cladding is determined according to the doping concentration and the cladding absorption coefficient of the semiconductor laser pumping light, the generally selected total length is required to ensure that the absorption of the pumping light introduced by the semiconductor laser is more than 20dB, and the requirements of resonant gain.
The output end of the same-band pump light wavelength low-reflection grating 42 is connected with the input end of the signal light wavelength low-reflection grating 43 through low-loss fusion welding, and the same-band pump light wavelength low-reflection grating is paired with the same-band pump light wavelength high-reflection grating 41 for use, and forms a resonant cavity with the same-band pump light together with the double-clad doped fiber 51. The reflectivity interval of the laser light source to the wavelength of the same pump light is 5-50%, the bearable pump power is more than or equal to 1000W, and the bearable laser power is more than or equal to 800W;
the output end of the signal light wavelength low reflection grating 43 is connected with the input end of the cladding light filter 70 through low-loss fusion, the fiber diameter and the numerical aperture of the signal light wavelength low reflection grating are consistent with those of the tail fiber of the same-band pumping light wavelength low reflection grating 42, the reflectivity range of the signal light wavelength is 2% -10%, and too high reflectivity can cause the signal light gain to be dominant to inhibit the oscillation of the same-band pumping light. The bearable pumping power is more than or equal to 1000W, and the bearable laser power is more than or equal to 800W;
the output end of the cladding light filter 70 is connected with one end of the double-cladding doped fiber 52 in the amplification stage module 03 through low-loss fusion, the cladding light filter is manufactured on the tail fiber of the output end of the signal light wavelength low-reflection grating 43, the fiber diameter parameter and the numerical aperture are consistent with those of the signal light wavelength low-reflection grating 43, the function of the cladding light filter is to filter residual pump light in the cladding and laser leaked from the fiber core to the cladding, and the filtering capacity is more than or equal to 200W;
the double-clad doped fiber 52 in the amplification stage module 03 is a fiber core ytterbium-doped fiber, the size of the fiber diameter is not lower than that of the double-clad doped fiber 51, and the numerical aperture of the fiber core/clad is not lower than that of the double-clad doped fiber 51. The length of the optical fiber is determined according to the output co-band pumping light power of the resonant cavity module 02 and the absorption coefficient of the fiber core doped with ytterbium ions to the co-band pumping light, and the selected optical fiber length is generally ensured to meet the requirement that the total absorption of the fiber core to the co-band pumping light is more than or equal to 20dB so as to meet the requirement that the co-band pumping light is fully absorbed and amplified into signal light to be output;
the output end cap 62 in the amplifier stage module 03 is a quartz end cap, which is the laser output end of the amplifier stage and can bear laser power more than or equal to 3000W.
The invention utilizes a gain fiber to realize the simultaneous generation of signal light and light with two wavelengths of pump light in the same band, the signal light and the light with two wavelengths are both restricted in the same fiber core, and then the light with two wavelengths is guided into the fiber core of an amplification stage, thereby realizing the high-power amplified output of the pump in the same band. The scheme integrally ensures that signal light and pump light in the same band are in the same fiber core, increases the absorption efficiency of doped ions in an amplification level to the pump light in the same band, is structurally impractical for a coupling device to introduce the pump light in the same band, has a simple structure, and improves the stability of a high-power fiber laser.
The invention has the beneficial effects that:
1. the same-band pump amplification output of the fiber core can be realized in the large-mode-field double-clad fiber;
2. pump light and signal light with the same band are generated in the same optical fiber, and a coupling device is not needed for leading in, so that the structure is simple;
3. the fiber core of the structure is simple in scheme and high in integration level with the pumping fiber laser;
4. the fiber core of the high-power fiber laser can be amplified and output by the same pump.
Drawings
FIG. 1 is a schematic view of the structure of the present invention.
Detailed description of the invention
A fiber core co-band pumping fiber laser is characterized by comprising a pumping module 01 and a resonant cavity module 02 amplification level module 03, wherein the pumping module 01 and the resonant cavity module 02 are welded through low loss, and the resonant cavity module 02 and the amplification level module 03 are welded through low loss;
the pumping module 01 comprises a semiconductor laser 1, a semiconductor laser 2 and a semiconductor laser …, wherein N is less than or equal to 20; the number of the pump beam combiners is 30, and the pump beam combiners are N and are of a (N +1) x 1 type, wherein N is less than or equal to 20; the pumping arms 20 of the pumping beam combiner 30 are connected with the semiconductor lasers in a one-to-one low-loss welding mode through N (N is less than or equal to 20) in the same number, the oblique end face 61 is a signal fiber of the (N +1) x 1 type pumping beam combiner 30, and the angle of the end face is more than or equal to 5 degrees;
the resonant cavity module 02 comprises a high reflection grating 41 with the same pump light wavelength, a double-cladding doped fiber 51, a low reflection grating 42 with the same pump light wavelength, a signal light wavelength low reflection grating 43 and a cladding light filter 70;
the amplifier stage module 03 comprises a double-clad doped fiber 52, an output end cap 62;
the semiconductor laser 1 and the semiconductor laser 2 … are semiconductor lasers with the same parameters, N (N is less than or equal to 20), all the semiconductor lasers are provided with tail fiber output, the fiber diameter parameters of the output tail fibers are the same as those of the pumping arm 20 of the pumping beam combiner 30, and the numerical aperture of the output tail fibers of all the semiconductor lasers is not higher than that of the pumping arm 20; all the semiconductor lasers are connected with the pumping arm 20 of the pumping beam combiner 30 through low-loss welding with tail fibers, and the inside of each semiconductor laser can be single-tube coupling or target bar coupling.
The pumping beam combiner 30(N is less than or equal to 20) is of a (N +1) x 1 type, the single-arm bearing capacity of the pumping arm 20 of the pumping beam combiner 30 is more than or equal to 100W laser power, the signal fiber end face of the input end of the pumping beam combiner 30 is manufactured into an oblique end face 61, the end face is smooth, the end face angle is more than or equal to 5 degrees, the transmitted laser is prevented from Fresnel reflection to influence the stability of a resonant cavity of co-band pumping light, and the gains of the signal light and spontaneous radiation light are enhanced.
The input end of the same-band pump optical wavelength high-reflection grating 41 is connected with the output end signal fiber of the pump beam combiner 30 in the pump module 01 through low-loss fusion, and the output end of the same-band pump optical wavelength high-reflection grating is connected with one end of the double-clad doped fiber 51 through low-loss fusion. The reflectivity of the optical fiber to the same pump light wavelength is more than or equal to 99%, the fiber diameter parameter is consistent with the output end signal fiber of the pump beam combiner 30, the pump power which can be borne by the high-reflection grating 41 with the same pump light wavelength is more than or equal to 1000W, and the laser power which can be borne is more than or equal to 800W.
The double-cladding doped fiber 51 is an ytterbium-doped fiber, the other end of the double-cladding doped fiber is connected with the input end of the same-band pump light wavelength low-reflection grating 42 through low-loss fusion, the diameter of the fiber core of the double-cladding doped fiber is consistent with that of the tail fiber of the same-band pump light wavelength high-reflection grating 41, the inner cladding of the double-cladding doped fiber can be in a polygonal, quincunx, D-shaped and other structures, the diameter of the inner cladding is equivalent to that of the tail fiber of the same-band pump light wavelength low-reflection grating 42, the length of the inner cladding is determined according to the doping concentration and the cladding absorption coefficient of the semiconductor laser pumping light, the generally selected total length is required to ensure that the absorption of the pumping light guided by the semiconductor laser is more than 20dB, and the requirements of resonant gain.
The output end of the same-band pump light wavelength low-reflection grating 42 is connected with the input end of the signal light wavelength low-reflection grating 43 through low-loss fusion welding, and the same-band pump light wavelength low-reflection grating is paired with the same-band pump light wavelength high-reflection grating 41 for use, and forms a resonant cavity with the same-band pump light together with the double-clad doped fiber 51. The reflectivity interval of the laser light source to the wavelength of the same pump light is 5-50%, the bearable pump power is more than or equal to 1000W, and the bearable laser power is more than or equal to 800W;
the output end of the signal light wavelength low reflection grating 43 is connected with the input end of the cladding light filter 70 through low-loss fusion, the fiber diameter and the numerical aperture of the signal light wavelength low reflection grating are consistent with those of the tail fiber of the same-band pumping light wavelength low reflection grating 42, the reflectivity range of the signal light wavelength is 2% -10%, and too high reflectivity can cause the signal light gain to be dominant to inhibit the oscillation of the same-band pumping light. The bearable pumping power is more than or equal to 1000W, and the bearable laser power is more than or equal to 800W;
the output end of the cladding light filter 70 is connected with one end of the double-cladding doped fiber 52 in the amplification stage module 03 through low-loss fusion, the cladding light filter is manufactured on the tail fiber of the output end of the signal light wavelength low-reflection grating 43, the fiber diameter parameter and the numerical aperture are consistent with those of the signal light wavelength low-reflection grating 43, the function of the cladding light filter is to filter residual pump light in the cladding and laser leaked from the fiber core to the cladding, and the filtering capacity is more than or equal to 200W;
the double-clad doped fiber 52 in the amplification stage module 03 is a fiber core ytterbium-doped fiber, the size of the fiber diameter is not lower than that of the double-clad doped fiber 51, and the numerical aperture of the fiber core/clad is not lower than that of the double-clad doped fiber 51. The length of the optical fiber is determined according to the output co-band pumping light power of the resonant cavity module 02 and the absorption coefficient of the fiber core doped with ytterbium ions to the co-band pumping light, and the selected optical fiber length is generally ensured to meet the requirement that the total absorption of the fiber core to the co-band pumping light is more than or equal to 20dB so as to meet the requirement that the co-band pumping light is fully absorbed and amplified into signal light to be output;
the output end cap 62 in the amplifier stage module 03 is a quartz end cap, which is the laser output end of the amplifier stage and can bear laser power more than or equal to 3000W.
The invention is described in detail below with reference to the following drawings:
the fiber core co-pumping fiber laser is shown in a structural schematic diagram of fig. 1, and the fiber core co-pumping fiber laser structurally comprises a pumping module 01, a resonant cavity module 02 and an amplification level module 03, wherein the functions of the modules are clear, and the pumping module 01 has the function of providing primary pumping energy for a semiconductor laser; the resonant cavity module 02 functions to convert most of the pumping light with the same band and a small amount of signal light by using the pumping energy provided by the pumping module 01; the amplification stage module 03 has the function of amplifying and outputting most of the same-band pump light output by the resonant cavity module 02 and a small amount of signal light in a fiber core pumping mode. The connection mode of each module is as follows: the pumping module 01 and the resonant cavity module 02 are fused with each other through low loss, and the resonant cavity module 02 and the amplification module 03 are fused with each other through low loss to form a fiber core common-band pumping fiber laser with a full fiber structure.
The pumping module 01 comprises a semiconductor laser 1, a semiconductor laser 2 and a semiconductor laser N (N is less than or equal to 20) …, and a pumping beam combiner 30 which is of a (N +1) multiplied by 1 type (N is less than or equal to 20). The semiconductor laser 1 and the semiconductor laser 2 … are semiconductor lasers with the same parameters, the semiconductor lasers all have tail fiber output, the fiber diameter parameter of the output tail fiber is the same as that of the pumping arm 20 of the pumping beam combiner 30, the cladding diameter of the output tail fiber is generally 105 μm, 200 μm and other specifications, the numerical aperture is generally 0.15, 0.2, 0.22 and other specifications, the numerical aperture of the output tail fiber of all the semiconductor lasers is not higher than that of the pumping arm 20, the output power of each semiconductor laser is not less than 50W, the output wavelength of the semiconductor laser is selected near 975nm, the absorption of ytterbium-doped fiber is facilitated, and the output wavelength of the semiconductor laser can be locked by the band grating. All semiconductor lasers with tail fibers are connected with a pumping arm 20 of a pumping beam combiner 30 through low-loss welding, a single tube or a target bar can be arranged in each semiconductor laser to serve as a light-emitting unit, the light is coupled into the optical fiber for output, and each semiconductor laser needs cooling water for heat dissipation protection during operation. The pump beam combiner 30 is a core device for introducing the pump light of each semiconductor laser into the double-clad fiber, has a structure of (N +1) × 1 type (N is less than or equal to 20), and can introduce the low-brightness pump light output by the N semiconductor lasers into the double-clad fiber. The pumping arms 20 of the pumping beam combiner 30 are connected with each semiconductor laser in a one-to-one low-loss welding mode, wherein the number of the pumping arms is N (N is less than or equal to 20), and the pump light bearing capacity of a single arm is more than or equal to 100W, so that sufficient pump light can be guided in. The pump light transmittance of each pump arm is greater than 98.5%, so that high-efficiency coupling of pump light is guaranteed, initial energy guarantee of high-power fiber cores and pumps with the same band is also achieved, and a heat dissipation protection device is needed for the outer wall of a device when the high-power pump light is introduced into the pump beam combiner 30. The end face of the signal fiber at the input end of the pumping beam combiner 30 is manufactured into an oblique end face 61, the end face is smooth, the angle of the end face is larger than or equal to 5 degrees, the transmission laser is prevented from being influenced by Fresnel reflection to the resonant cavity stability of the pump light in the same band, the gains of the signal light and the spontaneous radiation light are enhanced, the angle is selected to be 8 degrees during general manufacturing, and the feedback of the signal light can be effectively prevented and the spontaneous radiation light can be inhibited.
The resonant cavity module 02 comprises a high reflection grating 41 with the same pump light wavelength, a double-cladding doped fiber 51, a low reflection grating 42 with the same pump light wavelength, a low reflection grating 43 with the signal light wavelength and a cladding light filter 70, and the module is a core part for realizing the whole high-power fiber core same-band pump fiber laser and is a key unit for realizing the synchronous output of the same-band pump light and the signal light on the same fiber core. The connection sequence of each part in the module is as follows: the input end of the same-band pump optical wavelength high-reflection grating 41 is connected with the output end signal fiber of the pump beam combiner 30 in the pump module 01 through low-loss fusion, the output end of the same-band pump optical wavelength high-reflection grating 41 is connected with one end of the double-cladding doped optical fiber 51 through low-loss fusion, the other end of the double-cladding doped optical fiber 51 is connected with the input end of the same-band pump optical wavelength low-reflection grating 42 through low-loss fusion, the output end of the same-band pump optical wavelength low-reflection grating 42 is connected with the input end of the signal optical wavelength low-reflection grating 43 through low-loss fusion, and the output end of the signal optical wavelength low-reflection grating 43 is connected with the input end of the cladding optical filter 70 through low-loss fusion. Wherein the output of the cladding light filter 70 is connected to the double-clad doped fiber 52 in the amplifier stage module 03 by low loss fusion splicing.
The reflectivity of the same-band pump light wavelength high-reflection grating 41 in the resonant cavity module 02 to the wavelength of the same-band pump light is more than or equal to 99%, the fiber diameter parameter and the numerical aperture of the same-band pump light wavelength high-reflection grating are consistent with those of the signal fiber at the output end of the pump beam combiner 30, the sideband reflectivity to the laser of the different-band pump light wavelength is 0.1% -0.5%, and the very low reflectivity of the part is used as a part of signal light feedback. The wavelength of the pump light with the same band of the common ytterbium-doped fiber is selected to be about 1018nm, the wavelength of the signal light is selected to be about 1080nm, the bearable pump power of the high-reflection grating 41 with the same wavelength of the pump light is more than or equal to 1000W, the bearable laser power is more than or equal to 800W, and the high-power oscillation output of the pump light with the same band is ensured. The double-clad doped fiber 51 in the resonant cavity module 02 is an ytterbium-doped fiber, which is a gain medium for realizing output of light and signal light with the same pump, the diameter of the fiber core of the double-clad doped fiber is consistent with that of the fiber core of the tail fiber of the high-reflection grating 41 with the same pump light wavelength, the inner cladding of the double-clad doped fiber can be in a polygon, quincunx, D-shaped and other structures, the diameter of the inner cladding is equivalent to that of the tail fiber of the low-reflection grating 42 with the same pump light wavelength, the length of the inner cladding is determined according to the doping concentration and the cladding absorption coefficient of the pumping light of the semiconductor laser, the total length generally selected should ensure that the absorption of the cladding on the pumping light introduced by the semiconductor laser is above 20dB, the requirements of resonant gain of the pumping light with the same pump and suppression of amplified spontaneous emission light are met, and an additional cooling device is needed to dissipate heat when the double. The same-band pump light wavelength low-reflection grating 42 in the resonant cavity module 02 is an output end of the same-band pump light, is used in pair with the same-band pump light wavelength high-reflection grating 41, and forms a resonant cavity of the same-band pump light together with the double-clad doped fiber 51. The interval of the reflectivity of the low-reflection grating 42 for the wavelength of the same-band pump light is 5% -50%, the specific reflectivity is selected according to the introduced total pump light power, the length of the gain fiber and the parameter selection, the resonant cavity stability of the same-band pump light is optimized, the gain of the same-band pump light is increased, the amplified spontaneous radiation is inhibited, and the gain of the same-band pump light in the resonant cavity module 02 is ensured to be dominant. The bearable pumping power is more than or equal to 1000W, and the bearable laser power is more than or equal to 800W. The output end of the signal light wavelength low reflection grating 43 in the resonator module 02, which is placed behind the same-band pump light wavelength low reflection grating 42, is to ensure that the same-band pump light preferentially realizes oscillation output, because the gain of the signal light in the ytterbium-doped double cladding 51 is stronger than that of the same-band pump light, and once the signal light preferentially gains gain amplification, the same-band pump light will be suppressed. The fiber diameter and the numerical aperture of the grating are consistent with those of a tail fiber of the same-band pump optical wavelength low-reflection grating 42, the reflection bandwidth of the grating to signal light is less than or equal to 0.5nm, the reflectivity interval to the signal optical wavelength is 2-10%, and the grating is too wide to easily cause oscillation. The too high reflectivity can cause the signal light gain to be dominant to restrain the oscillation of the co-band pumping light, and the required signal light power does not need to be too high and can be at the watt level, so the restraining means is needed to be carried out on the signal light gain. The low power signal optical feedback comes from the very low sideband reflectivity of the same band pump optical wavelength high anti-grating 41 and the low reflectivity of the pump beam combiner 30. The pump light wavelength low reflection grating 42 with the same band can bear the pump power more than or equal to 1000W, and the laser power more than or equal to 800W.
The cladding light filter 70 in the resonant cavity module 02 is manufactured on the tail fiber of the output end of the signal light wavelength low reflection grating 43, the fiber diameter parameter is consistent with the numerical aperture and the signal light wavelength low reflection grating 43, the function of the filter is to filter the residual pump light in the cladding and the laser leaked from the fiber core to the cladding, the high-performance refractive index filter glue is used as a filter carrier to guide out the light in the cladding, and the filtering capacity is more than or equal to 200W. When the refractive index filtering glue is used for filtering, water is required to be added for cooling, so that the filtering effect is prevented from being influenced by high-temperature denaturation of the refractive index filtering glue.
The amplification stage module 03 comprises a double-clad doped fiber 52 and an output end cap 62, one end of the double-clad doped fiber 52 is connected with the output end of the cladding light filter 70 in the resonant cavity module 02 through low-loss fusion, the other end of the double-clad doped fiber 52 is connected with the output end of the output end cap 62 through low-loss fusion, and the output end of the output end cap 62 is the output end of the whole laser.
The double-clad doped fiber 52 in the amplification stage module 03 is a core ytterbium-doped fiber, the size of the fiber diameter is not lower than that of the double-clad doped fiber 51, and the numerical aperture of the core/clad is not lower than that of the double-clad doped fiber 51. The length of the optical fiber is determined according to the output co-band pumping light power of the resonant cavity module 02 and the absorption coefficient of the fiber core doped with ytterbium ions to the co-band pumping light, and the selected optical fiber length is generally ensured to meet the requirement that the total absorption of the fiber core to the co-band pumping light is more than or equal to 20dB so as to meet the requirement that the co-band pumping light is fully absorbed and amplified into signal light to be output. The output end cap 62 in the amplifier module 03 is a quartz end cap, the end face of which is plated with an antireflection film for signal light, the light transmittance of the signal light is greater than or equal to 98.5% of the laser output end of the amplifier, and the laser power which can be borne by the output end cap is greater than or equal to 3000W, so that the high-power signal light can be transmitted.
The fiber core same-band pumping fiber laser can realize same-band pumping amplification output of more than hundred watt level, and can realize two times of pumping operation only by introducing pumping light once, wherein the first time is that the semiconductor laser directly carries out cladding pumping to realize the same-band pumping light and signal light and the same fiber core is synchronously output, the second time is that the same-band pumping light is amplified to the signal light in the fiber core, and the resonant cavity module 02 and the amplification level module 03 are designed to be capable of operating automatically. The whole optical fiber laser has a simple structure, is convenient to operate, and is an effective way for realizing high-power and high-brightness laser output.
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 type and the position of the pumping beam combiner 30 of the pumping module 01 in the fiber core and pumping fiber laser are simply replaced, and the simple replacement of the wavelength of the pumping light and the signal light with the same fiber core and the same fiber core is within the protection range of the invention.
The fiber core co-band pumping fiber laser structurally comprises a pumping module 01, a resonant cavity module 02 and an amplification level module 03, wherein the pumping module 01 and the resonant cavity module 02 are welded in a low-loss mode, and the resonant cavity module 02 and the amplification level module 03 are welded in a low-loss mode;
the pumping module 01 comprises a semiconductor laser 1, a semiconductor laser 2 and a semiconductor laser …, wherein N (N is less than or equal to 20), a pumping beam combiner 30(N is less than or equal to 20) is of a (N +1) x 1 type, the number of pumping arms 20 of the pumping beam combiner 30 is N (N is less than or equal to 20) and is connected with the semiconductor lasers in a one-to-one low-loss welding mode, an oblique end face 61 is a signal fiber of the (N +1) x 1 type pumping beam combiner 30, and the angle of the end face is more than or equal to 5 degrees;
the resonant cavity module 02 comprises a high reflection grating 41 with the same pump light wavelength, a double-cladding doped fiber 51, a low reflection grating 42 with the same pump light wavelength, a signal light wavelength low reflection grating 43 and a cladding light filter 70;
the amplifier stage module 03 comprises a double-clad doped fiber 52, an output end cap 62;
the semiconductor laser 1 and the semiconductor laser 2 … are semiconductor lasers with the same parameters, the semiconductor lasers N (N is less than or equal to 20), all the semiconductor lasers are provided with tail fiber output, the fiber diameter parameters of the output tail fibers are the same as those of the pumping arm 20 of the pumping beam combiner 30, and the numerical aperture of the output tail fibers of all the semiconductor lasers is not higher than that of the pumping arm 20. All the semiconductor lasers are connected with tail fibers and the pumping arm 20 of the pumping beam combiner 30 through low-loss welding, and the interiors of the semiconductor lasers can be in single-tube coupling or target bar coupling;
the pumping beam combiner 30(N is less than or equal to 20) is of a (N +1) x 1 type, the single-arm bearing capacity of the pumping arm 20 of the pumping beam combiner 30 is more than or equal to 100W laser power, the signal fiber end face of the input end of the pumping beam combiner 30 is manufactured into an oblique end face 61, the end face is smooth, the end face angle is more than or equal to 5 degrees, the transmitted laser is prevented from being Fresnel-reflected to influence the stability of a resonant cavity of co-band pumping light, and the gains of the signal light and spontaneous radiation light are enhanced;
the input end of the same-band pump optical wavelength high-reflection grating 41 is connected with the output end signal fiber of the pump beam combiner 30 in the pump module 01 through low-loss fusion, and the output end of the same-band pump optical wavelength high-reflection grating is connected with one end of the double-clad doped fiber 51 through low-loss fusion. The reflectivity of the optical fiber to the same pump light wavelength is more than or equal to 99%, the fiber diameter parameter of the optical fiber is consistent with the output end signal fiber of the pump beam combiner 30, the pump power which can be borne by the high-reflection grating 41 with the same pump light wavelength is more than or equal to 1000W, and the laser power which can be borne is more than or equal to 800W;
the double-cladding doped fiber 51 is an ytterbium-doped fiber, the other end of the double-cladding doped fiber is connected with the input end of the same-band pump light wavelength low-reflection grating 42 through low-loss fusion, the diameter of the fiber core of the double-cladding doped fiber is consistent with that of the tail fiber of the same-band pump light wavelength high-reflection grating 41, the inner cladding of the double-cladding doped fiber can be in a polygonal, quincunx, D-shaped and other structures, the diameter of the inner cladding is equivalent to that of the tail fiber of the same-band pump light wavelength low-reflection grating 42, the length of the inner cladding is determined according to the doping concentration and the cladding absorption coefficient of the semiconductor laser pumping light, the generally selected total length is required to ensure that the absorption of the pumping light introduced by the semiconductor laser is more than 20dB, and the requirements of resonant gain;
the output end of the same-band pump light wavelength low-reflection grating 42 is connected with the input end of the signal light wavelength low-reflection grating 43 through low-loss fusion welding, and the same-band pump light wavelength low-reflection grating is paired with the same-band pump light wavelength high-reflection grating 41 for use, and forms a resonant cavity with the same-band pump light together with the double-clad doped fiber 51. The reflectivity interval of the laser light source to the wavelength of the same pump light is 5-50%, the bearable pump power is more than or equal to 1000W, and the bearable laser power is more than or equal to 800W;
the output end of the signal light wavelength low reflection grating 43 is connected with the input end of the cladding light filter 70 through low-loss fusion, the fiber diameter and the numerical aperture of the signal light wavelength low reflection grating are consistent with those of the tail fiber of the same-band pumping light wavelength low reflection grating 42, the reflectivity range of the signal light wavelength is 2% -10%, and too high reflectivity can cause the signal light gain to be dominant to inhibit the oscillation of the same-band pumping light. The bearable pumping power is more than or equal to 1000W, and the bearable laser power is more than or equal to 800W;
the output end of the cladding light filter 70 is connected with one end of the double-cladding doped fiber 52 in the amplification stage module 03 through low-loss fusion, the cladding light filter is manufactured on the tail fiber of the output end of the signal light wavelength low-reflection grating 43, the fiber diameter parameter and the numerical aperture are consistent with those of the signal light wavelength low-reflection grating 43, the function of the cladding light filter is to filter residual pump light in the cladding and laser leaked from the fiber core to the cladding, and the filtering capacity is more than or equal to 200W;
the double-clad doped fiber 52 in the amplification stage module 03 is a fiber core ytterbium-doped fiber, the size of the fiber diameter is not lower than that of the double-clad doped fiber 51, and the numerical aperture of the fiber core/clad is not lower than that of the double-clad doped fiber 51. The length of the optical fiber is determined according to the output co-band pumping light power of the resonant cavity module 02 and the absorption coefficient of the fiber core doped with ytterbium ions to the co-band pumping light, and the selected optical fiber length is generally ensured to meet the requirement that the total absorption of the fiber core to the co-band pumping light is more than or equal to 20dB so as to meet the requirement that the co-band pumping light is fully absorbed and amplified into signal light to be output;
the output end cap 62 in the amplifier stage module 03 is a quartz end cap, which is the laser output end of the amplifier stage and can bear laser power more than or equal to 3000W.
The invention aims to solve the problems existing in the technical background and the problem that the same-band pump light in the existing fiber core pump fiber laser needs to be guided into a gain fiber through a fiber core coupling device. A fiber core co-band pumping fiber laser is provided, which uses a forward end pumping structure, utilizes an (N +1) x 1 type pumping beam combiner to couple the pumping light of a semiconductor laser to a large mode field double-clad fiber, realizes synchronous pumping to the resonant cavity of the co-band pumping light and the resonant cavity of signal light, and can obtain the co-band pumping light and the signal light on one gain fiber. Forming a resonant cavity of the pump light with the same band by using a high-reflection grating pair and a low-reflection grating pair of the wavelength of the pump light with the same band, wherein the part is a main resonant cavity and consumes the pump light of the semiconductor laser; the resonant cavity of the signal light utilizes the parasitic oscillation composed of the low-reflection grating of the signal light and the low-reflectivity sideband of the high-reflection grating of the pumping light to obtain the signal light with low power. Then high-power co-band pumping light and low-power signal light are synchronously transmitted into the amplification stage from the fiber core, and amplification output of the fiber core co-band pumping light is realized in the gain fiber of the amplification stage.
The attached drawings are as follows:
FIG. 1 is a schematic diagram of a fiber core co-pumped fiber laser.
Claims (10)
1. A fiber core co-band pumping fiber laser is characterized by comprising a pumping module (01), a resonant cavity module (02) and an amplification level module (03), wherein the pumping module (01) and the resonant cavity module (02) are welded in a low-loss mode, and the resonant cavity module (02) and the amplification level module (03) are welded in a low-loss mode;
the pumping module (01) comprises a semiconductor laser 1, a semiconductor laser 2 and a semiconductor laser N …, wherein N is less than or equal to 20; the number of the pump beam combiners (30) is N, and the pump beam combiners are of a (N +1) x 1 type, wherein N is less than or equal to 20; the number of the pumping arms (20) of the pumping beam combiner (30) is also N, N is less than or equal to 20, the pumping arms are connected with the semiconductor lasers in a one-to-one low-loss welding mode, the end face of a signal fiber at the input end of the pumping beam combiner (30) is manufactured into an oblique end face (61), and the angle of the end face is more than or equal to 5 degrees;
the resonant cavity module (02) comprises a high-reflection grating (41) with the same pump light wavelength, a double-cladding doped fiber (51), a low-reflection grating (42) with the same pump light wavelength, a signal light wavelength low-reflection grating (43) and a cladding light filter (70);
the amplifier stage module (03) includes a double-clad doped fiber (52), an output end cap (62).
2. A fiber core common-band pump fiber laser according to claim 1, wherein the semiconductor laser 1 and the semiconductor laser 2 … are semiconductor lasers with the same parameters, N is less than or equal to 20, all semiconductor lasers have tail fiber output, the fiber diameter parameter of the output tail fiber is the same as that of the pump arm (20) of the pump combiner (30), and the numerical aperture of the output tail fiber of all semiconductor lasers is not higher than that of the pump arm (20); all the semiconductor lasers are connected with tail fibers through low-loss welding with a pumping arm (20) of a pumping beam combiner (30), and the interior of each semiconductor laser can be single-tube coupling or target bar coupling.
3. The fiber core co-band pumping fiber laser device according to claim 1 or 2, wherein the pump beam combiner (30), N is less than or equal to 20, which is of (N +1) × 1 type, the single arm bearing capacity of the pump arm (20) of the pump beam combiner (30) is more than or equal to 100W laser power, the end surface of the signal fiber at the input end is made into an oblique end surface (61), the end surface is smooth and the end surface angle is more than or equal to 5 degrees, so that fresnel reflection of transmitted laser is prevented from affecting the stability of the resonant cavity of the co-band pumping light and the gains of the signal light and the spontaneous emission light are enhanced.
4. The fiber laser with the same fiber core and pump as in claim 3, wherein the input end of the high-reflection grating (41) with the same pump light wavelength is connected with the output end signal fiber of the pump beam combiner (30) in the pump module (01) through low-loss fusion, the output end of the high-reflection grating is connected with one end of the double-clad doped fiber (51) through low-loss fusion, the reflectivity of the high-reflection grating to the same pump light wavelength is larger than or equal to 99%, the fiber diameter parameter of the high-reflection grating is consistent with that of the output end signal fiber of the pump beam combiner (30), the pump power of the high-reflection grating (41) with the same pump light wavelength is larger than or equal to 1000W, and the bearable laser power is larger than or equal to 800W.
5. The fiber laser of claim 1, wherein the double-clad doped fiber (51) is a ytterbium-doped fiber, the other end of the ytterbium-doped fiber is connected to the input end of the low-reflection grating (42) with the same pump light wavelength by low-loss fusion, the diameter of the core of the double-clad doped fiber is the same as that of the fiber core of the tail fiber of the high-reflection grating (41) with the same pump light wavelength, the inner cladding structure of the double-clad doped fiber comprises a polygonal structure, a quincunx structure and a D-shaped structure, the diameter of the inner cladding is equivalent to that of the tail fiber of the low-reflection grating (42) with the same pump light wavelength, the length of the inner cladding is determined according to the doping concentration and the cladding absorption coefficient of the pump light of the semiconductor laser, and the total length is selected to ensure that the absorption of the pump light introduced by the semiconductor laser is above 20dB, so as to satisfy the resonant gain of the pump light with.
6. The fiber core same-band pumping fiber laser device according to claim 1, wherein the output end of the same-band pumping optical wavelength low-reflection grating (42) is connected with the input end of the signal optical wavelength low-reflection grating (43) through low-loss fusion, the same-band pumping optical wavelength low-reflection grating and the signal optical wavelength low-reflection grating are used in pairs, the same-band pumping optical wavelength high-reflection grating and the double-clad doped fiber (51) form a same-band pumping optical resonant cavity, the reflectivity range of the same-band pumping optical wavelength is 5% -50%, the bearable pumping power is not less than 1000W, and the bearable laser power is not less than 800W.
7. The fiber laser with the same-fiber pump as in claim 1, wherein the output end of the signal light wavelength low-reflection grating (43) is connected with the input end of the cladding light filter (70) through low-loss fusion, the fiber diameter and the numerical aperture of the fiber laser are consistent with those of the tail fiber of the same-fiber pump light wavelength low-reflection grating (42), the reflectivity range of the fiber laser to the signal light wavelength is 2% -10%, too high reflectivity can cause signal light gain to be dominant to inhibit oscillation of the same-fiber pump light, the bearable pump power is not less than 1000W, and the bearable laser power is not less than 800W.
8. The fiber core co-pumping fiber laser device according to claim 1, wherein the output end of the cladding light filter (70) is connected with one end of the double-cladding doped fiber (52) in the amplification stage module (03) through low loss fusion, the fiber diameter parameter and the numerical aperture of the fiber diameter filter are consistent with those of the signal light wavelength low-reflection grating (43), the fiber diameter filter is used for filtering residual pumping light in the cladding and laser leaked from the fiber core to the cladding, and the filtering capacity is larger than or equal to 200W.
9. The fiber core co-band pumping fiber laser device of claim 1, wherein the double-clad doped fiber (52) in the amplification stage module (03) is a fiber core ytterbium-doped fiber, the size of the fiber diameter is not lower than that of the double-clad doped fiber (51), the numerical aperture of the fiber core/cladding is not lower than that of the fiber core/cladding of the double-clad doped fiber (51), the length of the fiber core/cladding is determined according to the output co-band pumping optical power of the resonant cavity module (02) and the absorption coefficient of the fiber core ytterbium-doped ions to the co-band pumping light, and the selected fiber length is ensured to meet the requirement that the total absorption of the fiber core to the co-band pumping light is not less than 20dB so as to meet the requirement that the co-band pumping light is fully absorbed and amplified into signal.
10. A fiber core co-pumping fiber laser as claimed in claim 1, wherein the output end cap (62) of said amplifier stage module (03) is a quartz end cap, which is the laser output end of the amplifier stage and can withstand laser power greater than or equal to 3000W.
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| CN108832470A (en) * | 2018-06-05 | 2018-11-16 | 天津凯普林光电科技有限公司 | A kind of optical fiber laser |
| CN108963738A (en) * | 2018-10-11 | 2018-12-07 | 中国人民解放军国防科技大学 | Double-end output linear cavity all-fiber laser oscillator |
| CN109038194B (en) * | 2018-10-11 | 2024-03-22 | 中国人民解放军国防科技大学 | Linear cavity all-fiber laser oscillator with adjustable double-end output power |
| CN113794091B (en) * | 2020-05-25 | 2023-07-18 | 深圳市创鑫激光股份有限公司 | Laser and multi-wavelength output laser processing system |
| CN113714634B (en) * | 2020-05-25 | 2023-10-31 | 深圳市创鑫激光股份有限公司 | Laser processing system and method |
| CN112345208B (en) * | 2020-10-29 | 2021-12-24 | 长沙大科激光科技有限公司 | Method and device for measuring mode instability threshold of single-mode fiber oscillator based on high-reflectivity grating leakage light |
| CN112769029A (en) * | 2021-01-22 | 2021-05-07 | 天津大学 | DBR short-cavity single-frequency fiber laser of multimode semiconductor pump source cladding pumping |
| CN114204391A (en) * | 2021-11-26 | 2022-03-18 | 华中科技大学 | Erbium-ytterbium co-doped optical fiber amplifier |
| CN115377784B (en) * | 2022-10-24 | 2023-03-24 | 中国航天三江集团有限公司 | Same-band pump optical fiber amplifier and method |
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