CN113285335B - Mixed gain semi-open cavity structure 2um optical fiber random laser - Google Patents
Mixed gain semi-open cavity structure 2um optical fiber random laser Download PDFInfo
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- CN113285335B CN113285335B CN202110549734.5A CN202110549734A CN113285335B CN 113285335 B CN113285335 B CN 113285335B CN 202110549734 A CN202110549734 A CN 202110549734A CN 113285335 B CN113285335 B CN 113285335B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
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- 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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- 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
- H01S3/094096—Multi-wavelength pumping
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- 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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- H—ELECTRICITY
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- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/14—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range characterised by the material used as the active medium
- H01S3/16—Solid materials
- H01S3/1601—Solid materials characterised by an active (lasing) ion
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- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/14—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range characterised by the material used as the active medium
- H01S3/16—Solid materials
- H01S3/1601—Solid materials characterised by an active (lasing) ion
- H01S3/1603—Solid materials characterised by an active (lasing) ion rare earth
- H01S3/1608—Solid materials characterised by an active (lasing) ion rare earth erbium
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- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/30—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range using scattering effects, e.g. stimulated Brillouin or Raman effects
- H01S3/302—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range using scattering effects, e.g. stimulated Brillouin or Raman effects in an optical fibre
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Abstract
The invention discloses a 2um optical fiber random laser with a mixed gain semi-open cavity structure, which comprises a pumping light source, a wavelength division multiplexer, a phosphorus-doped optical fiber, a thulium-doped optical fiber, 1566nm laser simultaneously pumps a passive phosphorus-doped optical fiber and an active thulium-doped optical fiber, fully utilizes the characteristic that a phosphorus-doped optical fiber phosphorus pentoxide Raman gain peak (1320cm-1) is superposed with a thulium-doped optical fiber gain peak to obtain stimulated Raman scattering gain and active optical fiber gain in a 2 micron waveband, generates 2 micron waveband optical fiber random laser in a distributed Rayleigh scattering semi-open cavity structure, solves the problem of large loss of 2 micron waveband optical signals in long-distance passive optical fiber transmission, obtains optical fiber random laser in the semi-open cavity structure, has extremely low noise characteristic, provides a brand new thought for optimization and performance improvement of a middle infrared waveband optical fiber laser, expands the emission wavelength of the optical fiber random laser to a middle infrared waveband, has important application value.
Description
Technical Field
The invention relates to the technical field of fiber lasers, in particular to a 2um fiber random laser with a hybrid gain semi-open cavity structure.
Background
The mid-infrared fiber laser has important application requirements in the fields of medicine, national defense, communication, industry and the like, and is widely researched and concerned. In recent years, an optical fiber random laser based on an open cavity structure is expected to be widely applied in the fields of imaging, communication and the like due to the advantages of simple structure, easiness in realizing high-power/high-efficiency lasing, extremely low noise characteristic and the like. The generation of the optical fiber random laser depends on the distributed Rayleigh scattering feedback accumulated by the long-distance optical fiber, and the medium-infrared optical fiber has great transmission loss in the silicon-based optical fiber, so that the realization of the laser of the type in the medium-infrared band is hindered.
According to the above, the hybrid gain semi-open structure is provided, the large raman frequency shift of the phosphorus-doped optical fiber and the common absorption and emission waveband of the thulium-doped optical fiber are fully utilized, 1566nm pump laser is adopted to stimulate raman scattering in the phosphorus-doped optical fiber and active gain in the thulium-doped optical fiber, the common gain is obtained in the 2um waveband, the problem of large loss of 2-micron waveband optical signals in long-distance passive optical fiber transmission is solved, the optical fiber random laser in the semi-open cavity structure is obtained, the laser has extremely low noise characteristics, a brand new thought is provided for optimization and performance improvement of the medium-infrared waveband optical fiber laser, the emission wavelength of the optical fiber random laser is expanded to the medium-infrared waveband, and the hybrid gain semi-open structure has important application value.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: a novel distributed feedback type random fiber laser structure with the working wavelength near 2 microns is provided to improve the light-light conversion efficiency and the output power.
In order to solve the technical problems, the technical scheme of the invention is as follows: a hybrid gain semi-open cavity 2um fiber random laser, said random fiber laser having an operating wavelength in the vicinity of 2 microns comprising:
a pump light source: for generating pump light; consists of 1566nm HR FBG, 976nm LD, a beam combiner, erbium-doped fiber and 1566nm LR FBG;
1566nm HR FBG, which reflects 1566nm light back to the laser cavity, thus avoiding the generated 1566nm light from overflowing into the laser cavity and reducing the output of the laser;
976nmLD for generating 976nm light;
the beam combiner is used for coupling the reflected light of the 1566nm HR FBG and the light generated by the 976nm LD to an optical fiber;
the erbium-doped optical fiber absorbs 976nm laser pumped by a 976nm LD pumping light source, and performs active gain amplification to generate 1566nm laser;
the 1566nm LR FBG is used for continuously participating in active gain amplification by carrying out high-back-reflection on the residual 976nm pumping light passing through the erbium-doped fiber, transmitting 1566nm light generated by the active gain amplification after passing through the erbium-doped fiber, and outputting 1566nm laser from a laser;
the 1560 end of the wavelength division multiplexer is connected with the 1566nm LR FBG;
the wavelength division multiplexer couples the pump light to the active optical fiber, and the active optical fiber performs gain amplification on laser generated by a pump light source; the 1974nm FBG written in the tail part of the active optical fiber reflects 1974nm light to the end of the wavelength division multiplexer 1950 for output;
further, the wavelength of the pump light is 1566 nm.
Further, the optical fiber port is beveled to prevent cross-section feedback.
Further, the length of the phosphorus-doped optical fiber is 500m, and the length of the thulium-doped optical fiber is 3 m.
Further, the reflectivity of the HR FBG is greater than 90%, and the reflectivity of the LR FBG is less than 10%. .
Compared with the prior art, the 2um optical fiber random laser with the mixed gain semi-open cavity structure has the structural advantages that 1566nm pumping is utilized, the first-order stimulated Raman scattering gain of the phosphorus-doped optical fiber can be utilized, the active gain of the thulium-doped optical fiber can also be utilized, two nonlinear processes are simultaneously gained by one pumping, the generated wavelengths are overlapped, and the light conversion efficiency and the output power can be effectively improved.
Drawings
Fig. 1 is a schematic structural diagram of a 2um fiber random laser with a hybrid gain semi-open cavity structure.
A pumping light source 1, a wavelength division multiplexer 2, a phosphor-doped optical fiber 3 and a thulium-doped optical fiber 4.
The following detailed description will be further described in conjunction with the above-described drawings.
Detailed Description
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the concepts underlying the described embodiments, however, it will be apparent to one skilled in the art that the described embodiments may be practiced without some or all of these specific details, and in other cases well-known process steps have not been described in detail.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the invention.
As shown in fig. 1, a mixed gain semi-open cavity structure 2um optical fiber random laser, a distributed feedback random optical fiber laser includes a pump light source 1, a wavelength division multiplexer 2, a phosphorus doped optical fiber 3, and a thulium doped optical fiber 4.
In one embodiment, the pump light source 1 generates pump light, which is 1566 nm.
In one embodiment, a Wavelength Division Multiplexer (WDM)2 includes 1560 terminals, 1950 terminals, com terminals. The 1560 terminal and the 1950 terminal are located on the same side of the wavelength division multiplexer 2, and the com terminal is located on the other side of the wavelength division multiplexer 2. The 1560 end of the wavelength division multiplexer 2 is connected with the pumping light source 1.
In one embodiment, the phosphorus doped fiber 3 may be a single mode fiber with different phosphorus ion doping concentrations, and the length of the phosphorus doped fiber is 500 meters. The phosphorus-doped fiber 3 is connected with the com end of the wavelength division multiplexer 2, and the wavelength division multiplexer 2 couples the pump light generated by the pump light source 1 to the phosphorus-doped fiber 3. The phosphorus-doped fiber 3 performs raman gain amplification due to a stimulated raman scattering effect on the pump light generated by the pump light source 1.
In one embodiment, the thulium doped fiber 4 has a length of 3 meters. The residual 1566nm pump light after passing through the 500m phosphor-doped optical fiber 3 passes through the thulium-doped optical fiber 4, and due to active gain amplification of thulium ions, the laser radiation of 1974nm is generated.
In one embodiment, a highly reflective fiber bragg grating with a reflectivity greater than 90% is written in the tail end of the thulium-doped optical fiber 4, and the highly reflective fiber bragg grating performs almost complete reflection on 1974nm distributed feedback type random laser generated by rayleigh scattering feedback and stimulated raman gain amplification in the 500m single-mode phosphorus-doped optical fiber 3 and on 1974nm stimulated radiation laser subjected to gain amplification in the 3m thulium-doped optical fiber 4 due to population inversion, and the laser is reflected into the thulium-doped optical fiber 4 and the phosphorus-doped optical fiber 3 to further amplify the required random laser. The high-reflectivity fiber Bragg grating can generate multiple reflections due to backward Rayleigh scattering generated by the single-mode phosphorus-doped fiber 3, so that the gain is greatly improved.
Specifically, 1566nm pump light emitted by the pump light source 1 passes through the wavelength division multiplexer 2 and the single-mode phosphorus-doped optical fiber 3, and rayleigh scattering of 500m single-mode phosphorus-doped optical fiber caused by uneven distribution of refractive index of the fiber core provides random distribution feedback, weak rayleigh scattering is continuously accumulated through a distance of 500m, and random distribution feedback is greatly improved; meanwhile, the single-mode phosphorus-doped optical fiber provides stimulated Raman gain amplification to gain and amplify the pump light, and when the power of a pump light source exceeds a lasing threshold and the gain obtained in the optical fiber is larger than loss, stable distributed feedback type random laser with the working wavelength of 1974nm can be obtained. The 1566nm pump light which is left after passing through the 500m phosphor doped optical fiber passes through the thulium doped optical fiber 4, and due to the active gain amplification of thulium ions, the 1974nm stimulated radiation laser can be generated, so that the pump light generated by the pump light source 1 can be utilized to the maximum extent, sufficient gain is provided, and the output of the 1974nm distributed feedback type random laser is formed. The 1974nm distributed feedback type random laser formed by the phosphorus-doped optical fiber 3 and the 1974nm stimulated radiation laser formed by the thulium-doped optical fiber 4 are almost totally reflected by the high-reflectivity fiber Bragg grating through the high-reflectivity fiber Bragg grating with the reflectivity larger than 90 percent written in the tail end of the thulium-doped optical fiber 4, and then are reflected into the thulium-doped optical fiber 4 and the phosphorus-doped optical fiber 3 to further amplify the required random laser. The high-reflectivity fiber Bragg grating can generate multiple reflections due to backward Rayleigh scattering generated by the single-mode phosphorus-doped fiber 3, so that the gain is greatly improved. Finally, after multiple amplification, 1974nm distributed feedback random laser and 1974nm stimulated emission laser are fed back to the wavelength division multiplexer 2 from the com end of the wavelength division multiplexer 2, and the wavelength division multiplexer 2 outputs feedback light of 1974nm from the 1950 end.
Claims (3)
1. The utility model provides a 2um optic fibre random laser of mixed gain semi-open cavity structure which characterized in that distributed feedback optic fibre random laser includes:
the pump light source is used for generating 1566nm pump laser, 1566nm simultaneously corresponds to the pump absorption wavelength of the thulium-doped optical fiber, and has the pump wavelength of 1320cm-1 Raman frequency shift phosphorus-doped optical fiber at a 2-micron waveband, so that the pump light source can simultaneously provide stimulated Raman scattering gain for the phosphorus-doped optical fiber, provide active gain for the thulium-doped optical fiber, and realize the mixed gain of the 2-micron waveband;
the first end of the wavelength division multiplexer is connected with the pumping light source; the second end of the wavelength division multiplexer is connected with the output port;
the wavelength division multiplexer is used for coupling the pump light generated by the pump light source to the phosphorus-doped optical fiber, and the phosphorus-doped optical fiber is used for amplifying Raman gain generated by a stimulated Raman scattering effect on the pump light;
the thulium-doped optical fiber is connected with the other end of the phosphorus-doped optical fiber and is used for carrying out active gain amplification on residual pump light after passing through the phosphorus-doped optical fiber;
and the high-reflectivity optical fiber Bragg grating connected with the other end of the thulium-doped optical fiber selects and determines the laser wavelength of 2-micron waveband, and forms a semi-open cavity structure together with distributed Rayleigh scattering in the phosphorus-doped optical fiber.
2. The 2um fiber random laser with the hybrid gain semi-open cavity structure as claimed in claim 1, wherein the pump light source wavelength and the high reflectivity fiber bragg grating wavelength correspond to the raman frequency shift of the phosphorus doped fiber in 1320cm "1, and correspond to the absorption and gain bands of the thulium doped fiber, respectively.
3. The 2um optical fiber random laser with the hybrid gain semi-open cavity structure as claimed in claim 1, wherein the fiber tail end in the structure is a bevel fiber, so as to avoid generating end face feedback, and ensure that the feedback of the cavity is provided only by a point-type high-reflectivity fiber bragg grating and distributed rayleigh scattering, so as to satisfy the characteristics of random laser open cavity and no resonance, and ensure that the generated laser has the characteristics of no longitudinal mode structure and low noise.
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| CN114927933B (en) * | 2022-05-13 | 2023-05-23 | 电子科技大学 | Super-long Raman fiber laser |
| CN114976838B (en) * | 2022-05-16 | 2024-08-02 | 电子科技大学 | Ultra-long distance high-order random fiber laser and sensor based on ultra-low loss fiber |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US6303051B1 (en) * | 1999-09-09 | 2001-10-16 | Osram Sylvania Inc. | Phosphate treated silicate phosphor |
| JP2001209081A (en) * | 2000-01-27 | 2001-08-03 | Sumitomo Electric Ind Ltd | Optical fiber for raman amplification, raman amplifier and optical transmission system |
| RU2158458C1 (en) * | 2000-02-08 | 2000-10-27 | Научный центр волоконной оптики при Институте общей физики РАН | Raman fiber laser |
| JP2005141159A (en) * | 2003-11-10 | 2005-06-02 | Nippon Telegr & Teleph Corp <Ntt> | Raman amplification system |
| CN102738697B (en) * | 2011-04-12 | 2014-03-12 | 深圳大学 | Realization method of 2.7 micron fiber laser and apparatus thereof |
| CN102761048B (en) * | 2012-05-16 | 2014-04-09 | 中国科学院上海光学精密机械研究所 | Tunable Raman fiber laser |
| CN103762485A (en) * | 2014-01-21 | 2014-04-30 | 中国计量学院 | Multi-wavelength optical fiber laser based on chirp grating and random distribution feedback |
| CN206451972U (en) * | 2016-10-25 | 2017-08-29 | 中国工程物理研究院激光聚变研究中心 | One kind mixes ytterbium random fiber laser |
| CN108493748B (en) * | 2018-04-03 | 2020-04-17 | 电子科技大学 | ytterbium-Raman mixed gain random fiber laser based on fiber core pumping |
| CN111446612A (en) * | 2020-05-20 | 2020-07-24 | 中国计量大学 | 2um waveband random fiber laser based on inclined fiber grating |
| CN111668688A (en) * | 2020-07-07 | 2020-09-15 | 中国人民解放军国防科技大学 | Three-cladding phosphorus-doped optical fiber and Raman fiber laser based on phosphorus-doped optical fiber |
| CN112186481A (en) * | 2020-11-09 | 2021-01-05 | 四川光盛物联科技有限公司 | Narrow-band low-noise random fiber laser Raman pumping light source |
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