CN113097847A - Novel narrow-linewidth high-power optical fiber laser generation device and method based on dispersion management - Google Patents
Novel narrow-linewidth high-power optical fiber laser generation device and method based on dispersion management Download PDFInfo
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- CN113097847A CN113097847A CN202110479189.7A CN202110479189A CN113097847A CN 113097847 A CN113097847 A CN 113097847A CN 202110479189 A CN202110479189 A CN 202110479189A CN 113097847 A CN113097847 A CN 113097847A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06754—Fibre amplifiers
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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
- H01S3/08—Construction or shape of optical resonators or components thereof
- H01S3/08004—Construction or shape of optical resonators or components thereof incorporating a dispersive element, e.g. a prism for wavelength selection
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/10053—Phase control
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Abstract
The invention belongs to the technical field of fiber laser, and particularly relates to a novel narrow-linewidth high-power fiber laser generating device and method based on dispersion management.
Description
Technical Field
The invention belongs to the technical field of fiber laser, and particularly relates to a novel narrow-linewidth high-power fiber laser generation device and method based on dispersion management.
Background
The narrow-linewidth high-power optical fiber laser has important application in the fields of light beam synthesis, laser frequency doubling, laser communication and the like. For a general narrow linewidth seed source, in the laser power amplification process, the output spectral width is widened, and the narrow linewidth characteristic cannot be maintained in the high-power output process. The researchers have proposed a single-frequency optical phase modulation method, which realizes spectrum broadening by phase modulation of a single-frequency seed source, and then performs power amplification on the broadened signal. The method can obtain high-power laser output while keeping the laser linewidth at a narrow level. However, this solution requires a plurality of rf signal sources, electro-optic phase modulators and corresponding circuit control modules, and has a complex structure, high cost and insufficient reliability. Therefore, the development of a novel narrow-linewidth high-power fiber laser system with simple structure, stable performance and low cost becomes an important research direction.
Disclosure of Invention
The invention provides a novel narrow-linewidth high-power optical fiber laser generation device and method based on dispersion management, which can obtain narrow-linewidth high-power laser output.
The specific technical scheme is as follows:
a novel narrow linewidth high-power optical fiber laser generation device based on dispersion management is characterized in that: the laser generating device mainly comprises a super-fluorescence source seed 101, wherein the super-fluorescence source seed 101 is used for generating a laser signal;
the narrow linewidth filtering module 102, the narrow linewidth laser with specific central wavelength is obtained by the laser signal through the narrow linewidth filtering module 102;
the dispersion management module 103 is used for changing the phase of different wavelengths under the influence of dispersion effect in the bandwidth of the laser signal;
the laser power amplification module 104 is used for weakening the intensity of the nonlinear effect, inhibiting the speed of spectrum broadening, and improving the laser power.
The modules are connected in sequence by optical fibers.
Further, the super-fluorescent source seed 101 is composed of a gain fiber 201, a pump signal combiner 202 and a semiconductor pump source 203, and pump light output by the semiconductor pump source 203 is injected into the gain fiber 201 through the pump signal combiner 202.
Further, the gain fiber 201 is an ytterbium-doped gain fiber.
Further, the end face of the gain fiber 201 is chamfered.
Further, the narrow linewidth filtering module 102 is composed of a fiber grating 204, or a volume bragg grating, or a surface grating, or a chirped fiber grating 209.
Further, the dispersion management module 103 is composed of a passive fiber 206 or a chirped fiber grating 209 and a fiber circulator 205.
Further, the passive fiber 206 is a G652D fiber that is not less than 4km long.
Further, the laser power amplification module 104 is formed by one or more optical fiber power amplification structures as required, each optical fiber power amplification structure includes a semiconductor pump source 203, a pump signal combiner 202, a gain fiber 201, and a cladding light stripper 207, and an optical fiber isolator 208 is welded between the optical fiber power amplification structures.
A laser generation method based on the novel narrow linewidth high-power optical fiber laser generation device based on dispersion management of any one of the preceding claims is as follows:
step 1: the super-fluorescent source seed 101 generates a broadband laser signal;
step 2: obtaining narrow linewidth laser with specific central wavelength after passing through the narrow linewidth filtering module 102;
and step 3: after passing through the dispersion management module 103, the change amounts of the phases with different wavelengths in the laser signal bandwidth under the influence of the dispersion effect are different, and in the laser power amplification module 104, the intensity of the nonlinear effect is weakened, and the speed of spectrum broadening is suppressed, so that narrow-linewidth high-power laser is generated.
The invention has the following beneficial effects:
the invention provides a novel narrow-linewidth high-power optical fiber laser generating device and method based on dispersion management, which change the phase relation among sub-wavelengths in a traditional narrow-linewidth seed laser signal by a dispersion management method, thereby weakening the intensity of nonlinear effect in a power amplification stage, inhibiting the speed of spectrum broadening in the laser power amplification stage and obtaining the high-power laser output with narrow linewidth. The invention has the advantages of full optical fiber, simple structure and low cost, and lays a foundation for the large-scale application of narrow-linewidth high-power lasers.
Drawings
FIG. 1 is a block diagram of a novel narrow linewidth high power fiber laser device;
FIG. 2 is a schematic diagram of a laser generating device according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a laser generating apparatus according to an embodiment of the present invention.
Description of reference numerals:
101. a super-fluorescent source seed; 102. a narrow linewidth filtering module; 103. a dispersion management module; 104. a laser power amplification module; 201. a gain fiber; 202. a pump signal combiner; 203. a semiconductor pump source; 204. a fiber grating; 205. a fiber optic circulator; 206. a passive optical fiber; 207. a cladding light stripper; 208. a fiber isolator; 209. chirped fiber grating.
Detailed Description
In order to make the implementation of the method of the present invention more clear, the present invention will be explained in detail below with reference to the accompanying drawings and examples. The specific embodiments described herein are merely illustrative of the invention and do not limit the scope of the invention as claimed.
Fig. 1 is a schematic block diagram of a narrow-linewidth high-power fiber laser generation device based on dispersion management according to the present invention, which mainly comprises four modules: the system comprises a super-fluorescence source seed 101, a narrow linewidth filtering module 102, a dispersion management module 103 and a power amplification module 104. The modules are connected in sequence through optical fibers. According to different implementation cases, the modules are formed in different ways.
The super-fluorescent light source seeds 101 generate broadband laser signals, and narrow linewidth lasers with specific central wavelengths are obtained after passing through the narrow linewidth filtering module 102. After passing through the dispersion management module 103, the phase of different wavelengths within the laser signal bandwidth changes differently under the influence of the dispersion effect, so that in the subsequent power amplification module 104, the intensity of the nonlinear effect is weakened, the speed of spectrum broadening is suppressed, and thus, narrow-linewidth high-power laser is generated.
The first embodiment is as follows:
fig. 2 is a schematic structural diagram of a laser generator according to this embodiment.
The super-fluorescent source seed 101 in this embodiment mainly includes a gain fiber 201, a pump signal combiner 202, and a semiconductor pump source 203. The 976nm pump light output by the semiconductor pump source 203 is injected into the gain fiber 201 through the pump signal combiner 202. In this embodiment, the gain fiber 201 is an ytterbium-doped gain fiber, and the end face of the gain fiber 201 is chamfered to reduce the ratio of the return light, so that the gain fiber 201 operates in a spontaneous radiation state and outputs incoherent light with a wide spectrum in a range of 1030nm to 1090 nm.
The narrow linewidth filtering module 102 in this embodiment mainly includes an optical fiber circulator 205 and an optical fiber grating 204, the wide spectrum laser output by the seed source enters from a port 1 of the optical fiber circulator 205, and the central wavelength of the optical fiber grating 204 can be tuned in a sub-nanometer order through a change in temperature or stress, so as to obtain a narrow linewidth seed source with an adjustable central wavelength. The spectral filtering element used by the narrow linewidth filtering module 102 may also be a fiber grating 204, a volume bragg grating, a surface grating, or other optical devices that can implement the narrow linewidth filtering function.
The dispersion management module 103 of this embodiment is mainly composed of a passive fiber 206, in this embodiment, the passive fiber 206 is a 4km long G652D fiber, and the dispersion effect required by the present invention is achieved by using the dispersion effect of the passive fiber 206. Due to the nonlinear effect existing in the passive optical fiber 206, the spectral width of the laser output by the dispersion management module 103 is broadened to 0.12 nm.
The laser power amplification module 104 in this embodiment mainly includes a semiconductor pump source 203, a pump signal combiner 202, a gain fiber 201, a cladding light stripper 207, and a fiber isolator 208. In the embodiment, a four-stage power amplification structure is adopted, and the output power is gradually increased to 1 kW. The cladding light stripper 207 is used for stripping unabsorbed residual pumping light and high-order mode laser signals leaked into the cladding, and the optical fiber isolator 208 is used for protecting the optical devices of the previous stage from being damaged by backward return light of the next stage. After four-stage power amplification, the output laser power reaches 1kW, and the spectral line width is 0.16 nm.
Example two:
as described in the first embodiment, a long-haul passive fiber is used as the dispersion management module 103. In this example, the narrow linewidth filtering module 102 and the dispersion management module 103 are constructed in another way.
The specific structure of the laser generating device is shown in fig. 3. The structure and principle of the super-fluorescent source seed 101 are the same as those of the first embodiment, and are not described herein again.
The narrow linewidth filtering module 102 in this embodiment adopts the optical fiber circulator 205 and the chirped fiber grating 209, the refractive index modulation period of the chirped fiber grating 209 changes linearly or nonlinearly in the optical fiber axial direction, the insertion loss is small, the dispersion compensation amount is large, and the dispersion generated by an optical fiber with a length of several centimeters can be compensated for over a hundred kilometers. The chirped fiber grating 209 is used as a filter device, and the functions of the narrow linewidth filter module 102 and the dispersion management module 103 can be simultaneously completed. Two narrow linewidth filtering modules 102 composed of the optical fiber circulator 205 and the chirped fiber grating 209 are cascaded to obtain signal light with high spectral signal-to-noise ratio, and the laser power is increased to 1kW by a four-stage power amplifier with the same structure as that in the first embodiment.
The present invention is not limited to the above embodiments, but should be defined by the scope of the appended claims.
Claims (9)
1. A novel narrow linewidth high-power optical fiber laser generation device based on dispersion management is characterized in that: the laser generating device mainly comprises a super-fluorescence source seed (101), wherein the super-fluorescence source seed (101) is used for generating a laser signal;
the narrow linewidth filtering module (102), the laser signal gets the narrow linewidth laser of the specific central wavelength through the narrow linewidth filtering module (102);
a dispersion management module (103), the dispersion management module (103) being configured to change the phase of different wavelengths within the bandwidth of the laser signal under the influence of a dispersion effect;
the laser power amplification module (104) is used for weakening the intensity of the nonlinear effect, inhibiting the speed of spectrum broadening and improving the laser power.
The modules are connected in sequence by optical fibers.
2. The novel narrow-linewidth high-power fiber laser generating device based on dispersion management according to claim 1, wherein: the super-fluorescence source seed (101) is composed of a gain fiber (201), a pumping signal beam combiner (202) and a semiconductor pumping source (203), and pumping light output by the semiconductor pumping source (203) is injected into the gain fiber (201) through the pumping signal beam combiner (202).
3. The novel narrow-linewidth high-power fiber laser generating device based on dispersion management according to claim 2, wherein: the gain fiber (201) is an ytterbium-doped gain fiber.
4. The novel narrow-linewidth high-power fiber laser generating device based on dispersion management according to claim 2, wherein: the end face of the gain fiber (201) is processed by beveling.
5. The novel narrow-linewidth high-power fiber laser generating device based on dispersion management according to claim 1, wherein: the narrow linewidth filtering module (102) is composed of a fiber grating (204), a volume Bragg grating, a surface grating or a chirped fiber grating (209).
6. The novel narrow-linewidth high-power fiber laser generating device based on dispersion management according to claim 1, wherein: the dispersion management module (103) is composed of a passive fiber (206) or a chirped fiber grating (209) and a fiber circulator (205).
7. The novel narrow-linewidth high-power fiber laser generating device based on dispersion management according to claim 6, wherein: the passive optical fiber (206) is a G652D optical fiber not less than 4km long.
8. The novel narrow-linewidth high-power fiber laser generating device based on dispersion management according to claim 1, wherein: the laser power amplification module (104) is composed of one or more optical fiber power amplification structures according to requirements, each optical fiber power amplification structure comprises a semiconductor pump source (203), a pump signal beam combiner (202), a gain optical fiber (201) and a cladding light stripper (207), the components are sequentially connected through optical fibers, and an optical fiber isolator (208) is welded between each optical fiber power amplification structure.
9. A laser generation method based on a novel narrow linewidth high-power fiber laser generation device based on dispersion management of any one of claims 1-5, characterized in that:
step 1: the super-fluorescence source seed (101) generates a broadband laser signal;
step 2: narrow linewidth laser with specific central wavelength is obtained after passing through the narrow linewidth filtering module (102);
and step 3: after passing through the dispersion management module (103), the phase positions of different wavelengths in the laser signal bandwidth have different change amounts under the influence of the dispersion effect, the intensity of the nonlinear effect is weakened in the laser power amplification module (104), the speed of spectrum broadening is restrained, and therefore narrow-linewidth high-power laser is generated.
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| CN114336245A (en) * | 2021-12-31 | 2022-04-12 | 湖南大科激光有限公司 | Multi-wavelength fiber laser |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114336245A (en) * | 2021-12-31 | 2022-04-12 | 湖南大科激光有限公司 | Multi-wavelength fiber laser |
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