CN112787207A - High-power narrow linewidth optical fiber laser based on ring cavity oscillator seed source - Google Patents
High-power narrow linewidth optical fiber laser based on ring cavity oscillator seed source Download PDFInfo
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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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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
- H01S3/06716—Fibre compositions or doping with active elements
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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
- H01S3/06791—Fibre ring lasers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
- H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
- H01S3/0941—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light of a laser diode
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Abstract
The invention provides a high-power narrow linewidth optical fiber laser based on a ring cavity oscillator seed source, which comprises a ring cavity oscillator seed source, a main laser amplifier and a main output end, wherein the ring cavity oscillator seed source, the main laser amplifier and the main output end are sequentially connected; the ring cavity oscillator seed source comprises a filter device, a laser output module and a pre-laser amplifier, the filter device, the laser output module and the pre-laser amplifier are sequentially connected to form a ring structure, and the ring cavity oscillator seed source is connected with the main laser amplifier through one output end of the laser output module. The laser only needs one-stage amplification, has simple structure and reliable performance, can reduce the complexity of a high-power narrow-linewidth optical fiber laser system, ensures that the power is further amplified without being inhibited by nonlinear effect, has more stable output laser time sequence, and can improve the inhibition capability of stimulated Raman scattering in the power amplification process.
Description
Technical Field
The invention belongs to the field of fiber laser equipment, and particularly relates to a high-power narrow-linewidth fiber laser based on a ring cavity oscillator seed source.
Background
High power narrow linewidth fiber lasers are important units for spectral synthesis and coherent synthesis. The high-power narrow linewidth fiber laser which is popular at present can be divided into three types according to different types of seed sources, namely a single-frequency phase modulation laser, a narrow linewidth oscillator and a super-fluorescence or random laser filtering seed source.
The single-frequency phase modulation laser needs to inhibit the stimulated Brillouin scattering effect in the power amplification process due to the over-narrow line width of the single-frequency laser, and needs an expensive and accurate phase modulation system to apply white noise or sinusoidal signal phase modulation to the single-frequency phase modulation laser so as to widen the spectrum of the single-frequency phase modulation laser; due to the low output power of the single-frequency laser, a multi-stage amplification device is often required.
Another method for suppressing the stimulated brillouin scattering is to directly filter and amplify a wide-spectrum light source, so that phase modulation is not applied thereto. Hyper-fluorescence filtering or stochastic laser filtering take advantage of this concept. However, the output power of the wide-spectrum filtering light source is low, so that the adoption of a multi-stage amplifying device cannot be avoided.
The narrow linewidth oscillator builds a resonant cavity through the fiber Bragg grating pair, utilizes the ytterbium-doped fiber as a gain medium, and uses the semiconductor laser as a pumping source to form a complete laser structure. Has the unique advantages of high output power and capability of adopting one-stage amplification. However, in the oscillator, due to self-phase modulation, cross-phase modulation and four-wave mixing nonlinear effects caused by multiple longitudinal modes and spatial hole burning effect caused by a standing wave field structure, spectral broadening is caused, which brings difficulty to control of line width under high power. In addition, the similar relaxation oscillation pulse and the self-mode locking pulse in the oscillator can cause unstable output laser time sequence, stimulated Raman scattering can occur in the amplification process, and further improvement of power is inhibited.
Disclosure of Invention
The technical problem to be solved by the invention is to overcome the defects of the prior art and provide a novel fiber laser which can reduce the complexity of a high-power narrow-linewidth fiber laser system and can further amplify the power without being inhibited by the nonlinear effect.
In order to solve the technical problems, the invention adopts the technical scheme that:
the high-power narrow linewidth optical fiber laser based on the ring cavity oscillator seed source comprises a ring cavity oscillator seed source, a main laser amplifier and a main output end, wherein the ring cavity oscillator seed source, the main laser amplifier and the main output end are sequentially connected;
the ring cavity oscillator seed source comprises a filter device, a laser output module and a pre-laser amplifier, the filter device, the laser output module and the pre-laser amplifier are sequentially connected to form a ring structure, and the ring cavity oscillator seed source is connected with the main laser amplifier through one output end of the laser output module.
Preferably, the filter device comprises a high-power optical fiber circulator and a high-reflection fiber bragg grating, a port 1 of the high-power optical fiber circulator is connected with the pre-laser amplifier, a port 2 of the high-power optical fiber circulator is connected with the high-reflection fiber bragg grating, and a port 3 of the high-power narrow-linewidth optical fiber laser is connected with the laser output module.
Preferably, the pre-laser amplifier comprises a pump source, and a pump/signal combiner, a first gain fiber and a cladding light filter which are connected in sequence, wherein an input end of the pump/signal combiner is connected with the laser output module and the pump source respectively, and an output end of the cladding light filter is connected with the filter.
Preferably, the laser output module comprises a high-power optical fiber isolator and a high-power optical fiber coupler, the input end of the high-power optical fiber isolator is connected with the filter, the output end of the high-power optical fiber isolator is connected with the input end of the high-power optical fiber coupler, and the output end of the high-power optical fiber coupler is respectively connected with the pre-laser amplifier and the main laser amplifier.
Preferably, the high-power narrow-linewidth fiber laser based on the ring-cavity oscillator seed source includes: the device comprises a mode matcher, a pumping source, a pumping/signal combiner, a gain fiber and a cladding light filter; the pumping source is connected with a pumping input arm of the pumping/signal combiner; the input end of the pattern matcher is connected with the ring cavity oscillator seed source.
Preferably, in the main laser amplifier, the pump source includes a forward pump source, the pump/signal combiner includes a forward pump/signal combiner, the gain fiber includes a second gain fiber, and the cladding light filter includes a forward cladding light filter;
the output end of the pattern matcher is connected with a signal input arm of the forward pump/signal combiner; the forward pump source is connected with a pump input arm of the forward pump/signal beam combiner; the second gain fiber is connected with a signal output arm of the forward pump/signal beam combiner and the forward cladding light filter; the forward cladding light filter is connected to the main output.
Preferably, in the main laser amplifier, the pump source further includes a backward pump source, the pump/signal combiner further includes a backward pump/signal combiner, and the cladding light filter includes a backward cladding light filter;
the output end of the pattern matcher is connected with a signal input arm of the forward pump/signal combiner through a backward cladding light filter;
the second gain fiber is connected with the forward cladding light filter through a backward pumping/signal combiner, the signal input end of the backward pumping/signal combiner is connected with the second gain fiber, the pumping input end of the backward pumping/signal combiner is connected with a backward pumping source, and the output end of the backward pumping/signal combiner is connected with the forward cladding light filter.
Preferably, in the main laser amplifier, the pump source includes a backward pump source, the pump/signal combiner includes a backward pump/signal combiner, the gain fiber includes a second gain fiber, and the cladding light filter includes a backward cladding light filter;
the output end of the pattern matcher is connected with a backward cladding light filter; the second gain fiber is connected with the backward cladding light filter and the signal input arm of the backward pump/signal beam combiner; and the pump input arm of the backward pump/signal combiner is connected with the backward pump source, and the output end of the backward pump/signal combiner is connected with the main output end.
Preferably, the pumping source is a semiconductor laser, and the central wavelength is 915nm or 976 nm;
the gain optical fiber is an ytterbium-doped optical fiber; the ytterbium-doped fiber is a double-clad large mode field fiber, the size of a fiber core is 15-50 mu m, the size of an inner cladding is 250-900 mu m, and the wavelength of the absorption coefficient at 976nm is 1-5 dB/m.
Preferably, the chamfer angle of the main output end is selected to be more than 8 °, and the main output end further comprises an end cap having more than 99% transmittance for the laser wavelength.
Compared with the prior art, the invention has the advantages that:
1. the high-power narrow-linewidth optical fiber laser adopts the ring cavity structure oscillator as a seed source, utilizes the high-power optical fiber circulator and the high-reflection fiber Bragg grating to carry out narrow-band filtering, uses a traveling wave field to avoid the defect of spectrum broadening caused by the space hole burning effect generated by the existence of a standing wave field in the traditional linear cavity structure, and also overcomes the defect of complex system structure caused by the adoption of multi-stage amplification of a single-frequency phase modulation seed source and a super-fluorescence filtering seed source.
2. The traveling wave field can make the optical field distribution in the fiber core of the optical fiber in the cavity uniform, and overcomes the non-linear effect caused by the non-uniform optical field distribution due to the standing wave, such as the spectrum broadening caused by self-phase modulation, cross-phase modulation, four-wave mixing and the like.
3. Based on the structure and by utilizing the existing mature multi-kilowatt optical fiber amplifier device, the multi-kilowatt narrow linewidth optical fiber laser output can be realized. Meanwhile, the device only adopts one-stage amplification and has the advantages of simple structure and reliable performance.
Drawings
Fig. 1 is a structural block diagram of a high-power narrow linewidth fiber laser based on a ring oscillator seed source according to the present invention.
Fig. 2 is a schematic structural diagram of a high-power narrow-linewidth fiber laser based on a ring oscillator seed source in a first embodiment.
Fig. 3 is a schematic structural diagram of a high-power narrow-linewidth fiber laser based on a ring oscillator seed source in a second embodiment.
Fig. 4 is a schematic structural diagram of a high-power narrow linewidth fiber laser based on a ring oscillator seed source in a third embodiment.
Description of the drawings:
1. a high power fiber optic circulator; 2. a high power fiber isolator; 3. a high power fiber coupler; 4. high reflective fiber bragg gratings; 5. a pump/signal combiner; 6. a first gain fiber; 7. a cladding light filter; 8. a pattern matcher; 9. a second gain fiber; 10. a main output end; 21. a pump source; 30. a forward pump/signal combiner; 31. a forward pump source; 32. a forward cladding light filter; 40. a backward pump/signal combiner; 41. a backward pumping source; 42. a backward cladding light filter.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The materials and equipment used in the following examples are commercially available.
The present embodiment provides a high-power narrow linewidth fiber laser based on a ring cavity oscillator seed source, and a structural block diagram of the fiber laser is shown in fig. 1, and the fiber laser includes a ring cavity oscillator seed source, a main laser amplifier, and a main output end 10, and the ring cavity oscillator seed source, the main laser amplifier, and the main output end 10 are connected in sequence; the ring cavity oscillator seed source comprises a filter device, a laser output module and a pre-laser amplifier, the filter device, the laser output module and the pre-laser amplifier are sequentially connected to form a ring structure, and the ring cavity oscillator seed source is connected with the main laser amplifier through one output end of the laser output module.
The output power of the pre-laser amplifier can be 50W magnitude, a conventional optical fiber laser amplifier can be adopted, the laser amplifier receives low-power seed laser (the received seed laser is generally 1-5W magnitude) and a high-power semiconductor laser pumping source, the high-power semiconductor laser pumping source is converted into laser which is the same as the seed laser wavelength, and then the laser is transmitted to the filter device. The filter device selects the central wavelength and compresses the line width of the laser, and the filtered laser is transmitted to the laser output module. The laser output module outputs laser with certain power, and transmits the rest laser serving as seed laser to the laser amplifier. The three parts together form a ring cavity structure.
As an embodiment, as shown in fig. 2, a schematic block diagram of an all-fiber high-power narrow-linewidth laser based on a ring oscillator seed source is provided. The filter comprises a high-power optical fiber circulator 1 and a high-reflection fiber Bragg grating 4, wherein a port 1 of the high-power optical fiber circulator 1 is connected with a pre-laser amplifier, a port 2 is connected with the high-reflection fiber Bragg grating 4, and a port 3 is connected with a laser output module.
The pre-laser amplifier comprises a pump source 21, a pump/signal beam combiner 5, a first gain fiber 6 and a cladding light filter 7 which are connected in sequence, wherein the input end of the pump/signal beam combiner 5 is respectively connected with a laser output module and the pump source 21 (a signal input arm of the pump/signal beam combiner 5 is connected with the laser output module, a pump input arm of the pump/signal beam combiner 5 is connected with the pump source 21), and the output end of the cladding light filter 7 is connected with a filter device. The number of pump sources 21 may be multiple, for example, 2 in fig. 2, and the pump/signal combiner 5 may be a (2+1) × 1 pump/signal combiner.
The laser output module comprises a high-power optical fiber isolator 2 and a high-power optical fiber coupler 3, wherein the input end of the high-power optical fiber isolator 2 is connected with the filter, the output end of the high-power optical fiber coupler 3 is connected with the input end of the high-power optical fiber coupler 2, and the output end of the high-power optical fiber coupler 3 is respectively connected with the pre-laser amplifier and the main laser amplifier.
In this embodiment, the pump source 21 injects pump light into the first gain fiber 6 through the pump arm of the pump/signal combiner 5; the high-power optical fiber coupler 3 injects the signal light into the first gain fiber 6 through the signal arm of the pump/signal combiner 5, and converts the pump light into laser light with a signal light wavelength to amplify the signal light. The amplified laser enters the port 1 of the high-power optical fiber circulator 1 after being filtered by the cladding light filter 7 to remove redundant pump light, the laser is output at the port 3 after being output at the port 2 and subjected to wavelength selection and line width compression by the high-reflection fiber Bragg grating 4, the output laser passes through the high-power optical fiber isolator 2 and has the functions of preventing backward-transmitted laser from damaging the high-power optical fiber circulator 1, then the laser with certain power is output through the high-power optical fiber coupler 3, and the residual laser is injected into a signal arm of the pump/signal combiner 5 as signal light.
It should be noted that the pump/signal combiner shown as the 2-pump input arm in the present invention can select pump/signal combiners of other specifications according to the requirement, and the number is not limited herein.
Specifically, the specific wavelength may be 1018nm to 1100 nm.
In particular, the pump source may also be selected from a plurality of wavelengths, such as: 915nm wavelength pump source or 976nm wavelength pump source.
Specifically, the central wavelength of the high-reflectivity fiber Bragg grating, the high-power optical fiber circulator and the high-power optical fiber isolator is 1018nm to 1100nm corresponding to the specific wavelength.
Specifically, the first gain fiber in the pre-laser amplifier is an ytterbium-doped fiber, the ytterbium-doped fiber is a double-clad large mode field fiber, the size of a fiber core can be 10-30 mu m, the size of an inner cladding is selected from 125-400 mu m, and the absorption coefficient can be a numerical value between 1dB/m and 5dB/m at the wavelength of 976 nm.
As an embodiment, the schematic diagram is shown in fig. 2, where the main laser amplifier is kilowatt-level, and the main laser amplifier includes a mode matcher 8, a forward pump source 31, a forward pump/signal combiner 30, a second gain fiber 9, and a forward cladding light filter 32; the mode matcher 8, the forward pump/signal combiner 30, the second gain fiber 9 and the forward cladding light filter 32 are sequentially connected, the input end of the mode matcher 8 is connected with a ring cavity oscillator seed source, the output end of the mode matcher 8 is connected with a signal input arm of the forward pump/signal combiner 30, and the forward pump source 31 is connected with a pump input arm of the forward pump/signal combiner 30; the signal output arm of the forward pump/signal combiner 30 is connected with the second gain fiber 9, and the forward cladding light filter 32 is connected with the main output end. The number of the forward pump sources 31 is plural, 6 are shown in the figure, but not limited to 6, and the forward pump sources 31 can select pump sources of various wavelengths, for example: 915nm wavelength pump source or 976nm wavelength pump source.
Laser output by the ring oscillator seed source is injected into a signal input arm of the forward pump/signal combiner 30 through the mode matcher 8, and the forward pump source 31 injects pump light into the second gain fiber 9 through a pump arm of the forward pump/signal combiner 30; the redundant pump light is filtered by the forward cladding light filter 32, and in the gain fiber, the pump light is converted into laser with the laser wavelength output by the corresponding ring cavity oscillator seed source through stimulated radiation, so that the optical power is amplified and output at the main output end 10.
As a second specific embodiment, as shown in fig. 3, the main laser amplifier includes a mode matcher 8, a backward cladding light filter 42, a forward pump source 31, a forward pump/signal combiner 30, a second gain fiber 9, a backward pump/signal combiner 40, a backward pump source 41, and a forward cladding light filter 32, and the mode matcher 8, the backward cladding light filter 42, the forward pump/signal combiner 30, the second gain fiber 9, the backward pump/signal combiner 40, and the forward cladding light filter 32 are sequentially connected, an input end of the mode matcher 8 is connected to the ring oscillator seed source, an output end thereof is connected to the backward cladding light filter 42, the forward pump source 31 is connected to a pump input arm of the forward pump/signal combiner 30, and the backward cladding light filter 42 is connected to a signal input arm of the forward pump/signal combiner 30, the second gain fiber 9 connects the output end of the forward pump/signal combiner 30 and the signal input arm of the backward pump/signal combiner 40, the pump input end of the backward pump/signal combiner 40 is connected to the backward pump source 41, the output end of the backward pump/signal combiner 40 is connected to the forward cladding light filter 32, and the output end of the forward cladding light filter 32 is connected to the main output end. The number of the forward pump source 31 and the backward pump source 41 is multiple, and although the number of the forward pump source 31 and the backward pump source 41 is shown as 6, the number of the forward pump source 31 and the backward pump source 41 may be not limited to 6, and the pump sources of multiple wavelengths may be selected, for example: 915nm wavelength pump source or 976nm wavelength pump source.
In this embodiment, the laser output from the ring oscillator seed source is injected into the signal input arm of the forward pump/signal combiner 30 through the mode matcher 8 and the backward cladding light filter 42, and the forward pump source 31 injects the pump light into the second gain fiber 9 through the pump arm of the forward pump/signal combiner 30; the backward pump source 41 injects pump light into the second gain fiber 9 through the pump arm of the backward pump/signal combiner 40; the excessive pump light is filtered by the forward cladding light filter 32 and the backward cladding light filter 42, respectively; in the second gain fiber 9, the pump light is converted into laser light of the laser wavelength output by the ring oscillator seed source through stimulated radiation, so that the optical power is amplified and output at the output end 10.
As a third embodiment, as a schematic diagram, as shown in fig. 4, the main laser amplifier includes a mode matcher 8, a backward cladding light filter 42, a second gain fiber 9, a backward pump/signal combiner 40 and a backward pump source 41, and the mode matcher 8, the backward cladding light filter 42, the second gain fiber 9 and the backward pump/signal combiner 40 are sequentially connected, an input end of the mode matcher 8 is connected to the ring oscillator seed source, an output end of the mode matcher 8 is connected to the backward cladding light filter 42, a signal input arm of the backward pump/signal combiner 40 is connected to the second gain fiber 9, a pump input arm of the backward pump/signal combiner 40 is connected to the backward pump source 41, an output arm of the backward pump/signal combiner 40 is connected to the main output end 10, the number of the backward pump sources 41 is plural, and is 6 as a specific example in the figure, but as a specific embodiment may not be limited to 6, the backward pump source 31 may select pump sources of various wavelengths, such as: 915nm wavelength pump source or 976nm wavelength pump source.
Laser output by the ring oscillator seed source is injected into the second gain fiber 9 through the mode matcher 8 and the backward cladding light filter 42; the backward pump source 41 injects pump light into the second gain fiber 9 through the pump arm of the backward pump/signal combiner 40; the redundant pump light is filtered by the backward cladding light filter 42; in the second gain fiber 9, the pump light is converted into laser of the laser wavelength output by the ring oscillator seed source through stimulated radiation, so that the optical power is amplified and output at the main output end 10.
The second gain fiber is a ytterbium-doped fiber, the ytterbium-doped fiber is a double-cladding large-mode-field fiber, the size of the fiber core can be 10-30 mu m, the size of the inner cladding is selected from 125-400 mu m, and the wavelength of the absorption coefficient at 976nm can be a numerical value between 1dB/m and 5 dB/m.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. The high-power narrow linewidth optical fiber laser based on the ring cavity oscillator seed source is characterized by comprising a ring cavity oscillator seed source, a main laser amplifier and a main output end (10), wherein the ring cavity oscillator seed source, the main laser amplifier and the main output end (10) are sequentially connected;
the ring cavity oscillator seed source comprises a filter device, a laser output module and a pre-laser amplifier, the filter device, the laser output module and the pre-laser amplifier are sequentially connected to form a ring structure, and the ring cavity oscillator seed source is connected with the main laser amplifier through one output end of the laser output module.
2. The high power narrow linewidth fiber laser based on the ring oscillator seed source of claim 1, wherein the filter device comprises a high power fiber circulator (1) and a highly reflective fiber bragg grating (4), wherein a port 1 of the high power fiber circulator (1) is connected with the pre-laser amplifier, a port 2 is connected with the highly reflective fiber bragg grating (4), and a port 3 is connected with a laser output module.
3. The high-power narrow-linewidth fiber laser based on the ring oscillator seed source of claim 1, wherein the pre-laser amplifier comprises a pump source (21), and a pump/signal combiner (5), a first gain fiber (6) and a cladding light filter (7) which are connected in sequence, and the input end of the pump/signal combiner (5) is connected with the laser output module and the pump source (21), respectively, and the output end of the cladding light filter (7) is connected with a filter device.
4. The high-power narrow-linewidth fiber laser based on the ring oscillator seed source of claim 1, wherein the laser output module comprises a high-power fiber isolator (2) and a high-power fiber coupler (3), an input end of the high-power fiber isolator (2) is connected with a filter device, an output end of the high-power fiber isolator is connected with an input end of the high-power fiber coupler (3), and an output end of the high-power fiber coupler (3) is respectively connected with a pre-laser amplifier and a main laser amplifier.
5. The high power narrow linewidth fiber laser based on a ring oscillator seed source of any one of claims 1 to 4, wherein the main laser amplifier comprises: the device comprises a mode matcher (8), a pumping source, a pumping/signal combiner, a gain fiber and a cladding light filter; the pumping source is connected with a pumping input arm of the pumping/signal combiner;
the input end of the pattern matcher (8) is connected with the ring cavity oscillator seed source.
6. The ring oscillator seed based high power narrow linewidth fiber laser of claim 5, wherein in the main laser amplifier, the pump source comprises a forward pump source (31), the pump/signal combiner comprises a forward pump/signal combiner (30), the gain fiber comprises a second gain fiber (9), and the cladding light filter comprises a forward cladding light filter (32);
the output end of the pattern matcher (8) is connected with a signal input arm of a forward pump/signal combiner (30); the forward pump source (31) is connected with the pump input arm of the forward pump/signal beam combiner (30); the second gain fiber (9) is connected with a signal output arm of the forward pump/signal combiner (30) and a forward cladding light filter (32); the forward cladding light filter (32) is connected to the main output (10).
7. The ring oscillator seed source based high power narrow linewidth fiber laser of claim 6 wherein in the main laser amplifier, the pump source further comprises a backward pump source (41), the pump/signal combiner further comprises a backward pump/signal combiner (40), the cladding light filter comprises a backward cladding light filter (42);
and the output end of the pattern matcher (8) is connected with the signal input arm of the forward pump/signal combiner (30) through a backward cladding light filter (42);
the second gain fiber (9) is connected with the forward cladding light filter (32) through a backward pumping/signal combiner (40), the signal input end of the backward pumping/signal combiner (40) is connected with the second gain fiber (9), the pumping input end of the backward pumping/signal combiner (40) is connected with a backward pumping source (41), and the output end of the backward pumping/signal combiner (40) is connected with the forward cladding light filter (32).
8. The ring oscillator seed based high power narrow linewidth fiber laser of claim 5, wherein in the main laser amplifier, the pump source comprises a backward pump source (41), the pump/signal combiner comprises a backward pump/signal combiner (40), the gain fiber comprises a second gain fiber (9), the cladding light filter comprises a backward cladding light filter (42);
the output end of the pattern matcher (8) is connected with a backward cladding light filter (42); the second gain fiber (9) is connected with a backward cladding light filter (42) and a signal input arm of a backward pump/signal beam combiner (40); the pump input arm of the backward pump/signal combiner (40) is connected with the backward pump source (41), and the output end of the backward pump/signal combiner (40) is connected with the main output end (10).
9. The high power narrow linewidth fiber laser based on a ring cavity oscillator seed source of claim 5, wherein the pump source is a semiconductor laser with a center wavelength of 915nm or 976 nm;
the gain optical fiber is an ytterbium-doped optical fiber; the ytterbium-doped fiber is a double-clad large mode field fiber, the size of a fiber core is 15-50 mu m, the size of an inner cladding is 250-900 mu m, and the wavelength of the absorption coefficient at 976nm is 1-5 dB/m.
10. The high power narrow linewidth fiber laser based on a ring oscillator seed source of any of claims 1-4, characterized in that the cut angle of the main output (10) is chosen to be greater than 8 °, the main output (10) further comprising an end cap with greater than 99% transmittance for the lasing wavelength.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110160603.8A CN112787207A (en) | 2021-02-05 | 2021-02-05 | High-power narrow linewidth optical fiber laser based on ring cavity oscillator seed source |
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| CN113540948A (en) * | 2021-06-30 | 2021-10-22 | 深圳公大激光有限公司 | Polarization-maintaining random green light and ultraviolet light laser |
| CN114430139A (en) * | 2021-12-19 | 2022-05-03 | 光惠（上海）激光科技有限公司 | Polarization-maintaining single-frequency broadening and amplifying system |
| CN115133386A (en) * | 2022-08-30 | 2022-09-30 | 中国人民解放军国防科技大学 | Narrow-spectrum optical fiber oscillator |
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| CN113540948A (en) * | 2021-06-30 | 2021-10-22 | 深圳公大激光有限公司 | Polarization-maintaining random green light and ultraviolet light laser |
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