CN114597738A - Annular cavity 1270nm Raman laser based on phosphorus-doped optical fiber and 1087nm pump laser - Google Patents
Annular cavity 1270nm Raman laser based on phosphorus-doped optical fiber and 1087nm pump laser Download PDFInfo
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- CN114597738A CN114597738A CN202111436390.3A CN202111436390A CN114597738A CN 114597738 A CN114597738 A CN 114597738A CN 202111436390 A CN202111436390 A CN 202111436390A CN 114597738 A CN114597738 A CN 114597738A
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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
- H01S3/0675—Resonators including a grating structure, e.g. distributed Bragg reflectors [DBR] or distributed feedback [DFB] fibre 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
- H01S3/05—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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Abstract
The invention discloses an annular cavity 1270nm Raman laser based on a phosphorus-doped optical fiber and 1087nm pump laser, which relates to the technical field of laser and comprises a pump laser and an optical fiber resonant cavity, wherein the optical fiber resonant cavity comprises a high-reflection grating, a pump light beam combiner, an ytterbium-doped optical fiber, a low-reflection grating, an irrelevant isolator, a wavelength division multiplexer, a polarization controller, a phosphorus-doped optical fiber, an output coupler and an output head. The center wavelength of the pump laser is 980nm, the 980nm pump laser is connected with the pump light beam combiner, the gain optical fiber is arranged in the optical fiber resonant cavity, and the passive optical fiber is sequentially connected with the low-reflection grating, the irrelevant isolator, the wavelength division multiplexer, the phosphorus-doped optical fiber, the output coupler and the output head. A pumping source with the wavelength of 980nm is adopted to pump ytterbium-doped fibers in a grating cavity to generate 1087nm laser, and the generated 1087nm laser is used as pumping laser to pump phosphorus-doped fibers in an annular cavity to generate a Stokes effect, so that 1270nm laser is output, and a 1270nm Raman laser is obtained. The output wavelength of the Raman laser is around 1270nm, and the Raman laser has great advantages in the aspects of laser physical therapy, wound healing and the like.
Description
Technical Field
The invention relates to the technical field of laser, in particular to an annular cavity 1270nm Raman laser based on a phosphorus-doped optical fiber and 1087nm pump laser.
Background
The fiber laser is widely applied to the fields of military, medical treatment and the like due to compact structure, convenient maintenance and good beam quality. Photodynamic therapy (PDT) is a non-invasive medical procedure widely used in clinical medicine, and has been demonstrated in the treatment of malignant tumors and some other benign diseases. The main principle of photodynamic therapy is that a large amount of active oxygen (mainly singlet oxygen) is generated in biological tissues by means of laser irradiation, and the strong oxidation of the singlet oxygen is utilized to kill tumor cells or pathological tissues. The photosensitization method is the main means of the current PDT technology and has wide clinical application. The photosensitization PDT technology has the defects of large photosensitive side effect, long treatment period, few photosensitive drugs capable of being clinically applied and the like. Therefore, no drug photodynamic therapy technology is currently being studied by researchers. Drug-free PDT attempts to directly excite oxygen molecules in the tissue to an excited state using laser light near 1270nm wavelength, producing a photodynamic therapeutic effect. The laser irradiation of 1270nm can avoid the side effect caused by using photosensitive medicine, and the wavelength of 1270nm is positioned at the overlapping position of the absorption lines of water, melanin and hemoglobin and positioned in a transparent window of biological tissues, so that the absorption is generally weaker, the treatment depth can be increased, and the damage to other normal tissues can be reduced. Due to the application prospect in the field of photodynamic therapy, lasers with output wavelength near 1270nm have attracted much attention in recent years. The 1270nm laser research currently available for photodynamic therapy research and application is not mature.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a ring cavity 1270nm Raman laser based on a phosphorus-doped optical fiber and 1087nm pump laser, and solves the problems in the background art.
In order to achieve the purpose, the invention is realized by the following technical scheme:
ring-cavity 1270nm Raman laser based on phosphorus-doped optical fiber and 1087nm pump laser
Preferably, the pump laser is a semiconductor laser, the central wavelength of the pump laser is 980nm, and the energy output by the pump laser is absorbed by the ytterbium-doped fiber and forms population inversion.
Preferably, the high-reflection grating and the low-reflection grating form a resonant cavity, the high-reflection grating is a fiber chirped bragg grating, the reflectivity of the fiber chirped bragg grating is 99.9%, the wavelength of a working center is 1087nm, the bandwidth is less than 2nm, and 15-degree cutting is performed on an output end to prevent laser in the reflective cavity.
Preferably, the ytterbium-doped fiber is a gain fiber, the core diameter is 10/130 μm, the length is 5m, and the gain fiber is pumped by a 980nm pump laser to form population inversion in the cavity to obtain 1087nm laser.
Preferably, the low-reflection grating is a fiber chirped bragg grating, the reflectivity of the low-reflection grating is 20%, the working center wavelength of the low-reflection grating is 1087nm, and the low-reflection grating and the high-reflection grating together form a resonant cavity.
Preferably, the irrelevant isolator is a 1087nm irrelevant isolator, and the irrelevant isolator is used for ensuring that 1087nm laser generated in the resonant cavity generates 1270nm laser through the pumping phosphorus-doped fiber in a one-way mode, and the laser cannot pass light in a reverse direction, so that the laser is prevented from being reflected back to the resonant cavity formed by the high-reflection grating and the low-reflection grating.
Preferably, the wavelength division multiplexer is an 1087/1130-1300nm broadband wavelength division multiplexer, and the input end of the wavelength division multiplexer is 1087nm laser.
Preferably, the polarization controller is a three-piece coil rotary type, and is used for adjusting the birefringence in the annular cavity to generate 1270nm laser light.
Preferably, the length of the phosphorus-doped optical fiber is 200m, and the phosphorus-doped optical fiber is used as a Raman optical fiber to generate 1270nm laser after being pumped by 1087nm laser.
Preferably, the output coupler is a 1270nm output coupler, the coupling ratio of the output coupler is 50:50, the working wavelength is 1270nm, 1270nm laser generated by the output head end is output, and the connecting output head end is a main output port.
Drawings
FIG. 1 is a schematic diagram of a ring cavity 1270nm Raman laser based on a phosphorus-doped fiber and 1087nm pump laser according to the present invention;
in the figure: 1. a pump laser; 2. a high reflection grating; 3. a pump light combiner; 4. an ytterbium-doped optical fiber; 5. a low reflection grating; 6. an extraneous isolator; 7. a wavelength division multiplexer; 8. a polarization controller; 9. a phosphorus-doped optical fiber; 10. an output coupler; 11. and (6) outputting the head.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the present invention provides a technical solution: a ring cavity 1270nm Raman laser based on phosphorus-doped optical fiber and 1087nm pump laser comprises a pump laser and a fiber resonant cavity, wherein the fiber resonant cavity comprises a high-reflection grating, a pump light beam combiner, ytterbium-doped optical fiber, a low-reflection grating, an irrelevant isolator, a wavelength division multiplexer, a polarization controller, phosphorus-doped optical fiber, an output coupler and an output head.
The pump laser 1 is a semiconductor laser, the central wavelength of the pump laser is 980nm, and the energy output by the pump laser 1 is absorbed by the ytterbium-doped optical fiber 4 and forms population inversion.
The high-reflection grating 2 and the low-reflection grating 5 form a resonant cavity, the high-reflection grating 2 is a fiber chirped Bragg grating, the reflectivity of the fiber chirped Bragg grating is 99.9%, the wavelength of a working center is 1087nm, the bandwidth is less than 2nm, the output end is cut at 15 degrees, and laser in the reflective cavity is prevented.
The ytterbium-doped fiber 4 is a gain fiber, the core diameter is 10/130 μm, the length is 5m, and the 1087nm laser is obtained by forming population inversion in the cavity after being pumped by a 980nm pump laser 1.
The low reflection grating 5 is a fiber chirped bragg grating, the reflectivity of the low reflection grating is 20%, the working center wavelength is 1087nm, and the low reflection grating and the high reflection grating jointly form a resonant cavity.
The irrelevant isolator 6 is a 1087nm irrelevant isolator and is used for ensuring that 1087nm laser generated in the resonant cavity generates 1270nm laser through the pumping phosphorus-doped fiber 9 in a one-way mode and cannot pass light in the reverse direction, so that the laser is prevented from being reflected back to the resonant cavity formed by the high-reflection grating 2 and the low-reflection grating 5.
The wavelength division multiplexer 7 is a 1087/1130-1300nm broadband wavelength division multiplexer, and the input end of the wavelength division multiplexer is 1087nm laser.
The polarization controller 8 is a three-piece coil rotary type, and is used for adjusting the birefringence in the annular cavity and generating 1270nm laser.
The length of the phosphorus-doped optical fiber 9 is 200m, and the phosphorus-doped optical fiber is used as a Raman optical fiber to generate 1270nm laser after being pumped by 1087nm laser.
Preferably, the output coupler 10 is an 1270nm output coupler, the coupling ratio of the output coupler is 50:50, the operating wavelength is 1270nm, 1270nm laser generated by the output head 11 end is output, and the output head 11 end connected with the output head is a main output port.
980nm pump laser enters a laser cavity through a beam combiner, 1087nm laser is generated by ytterbium-doped optical fiber pumped in a resonant cavity formed by a low-reflection grating and a high-reflection grating, 1087nm laser is used as new pump light and is output from the low-reflection grating, passes through a 1087nm polarization-independent isolator and then is connected to 1087/1130-1300nm wavelength division multiplexer pump phosphorus-doped optical fiber, 1270nm Raman laser is generated in an annular cavity formed by the wavelength division multiplexer, a polarization controller, the phosphorus-doped optical fiber and an output coupler, and 1270nm laser is output from an output head through the output coupler.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (12)
1. A ring cavity 1270nm Raman laser based on a phosphorus-doped fiber and 1087nm pump laser, comprising: the device comprises a pump laser (1), a high-reflection grating (2), a pump light beam combiner (3), an ytterbium-doped optical fiber (4), a low-reflection grating (5), an irrelevant isolator (6), a wavelength division multiplexer (7), a polarization controller (8), a phosphorus-doped optical fiber (9), an output coupler (10) and an output head (11).
2. The high-reflection grating (2), the pump light beam combiner (3), the ytterbium-doped optical fiber (4) and the low-reflection grating (5) are connected through a single-mode optical fiber to form a linear resonant cavity; the output end of the pump laser (1) is connected with the first end of the pump light beam combiner (3), one port of the high-reflection grating (2) is cut by 15 degrees, the other end of the high-reflection grating is connected with the second end of the pump light beam combiner (3), the third end of the pump light beam combiner (3) is connected with the first end of the ytterbium-doped optical fiber (4), the second end of the ytterbium-doped optical fiber (4) is connected with the first end of the low-reflection grating (5), the second end of the low-reflection grating (5) is connected with the first end of the irrelevant isolator (6), the second end of the irrelevant isolator (6) is connected with the first end of the wavelength division multiplexer (7), the second end of the wavelength division multiplexer (7) is connected with the first end of the polarization controller (8), the second end of the polarization controller (8) is connected with the first end of the phosphorus-doped optical fiber (9), the second end of the phosphorus-doped optical fiber (9) is connected with the first end of the output coupler (10), the second end of the output coupler (10) is connected with the third end of the wavelength division multiplexer (7) and the polarization controller (8), The phosphorus-doped optical fiber (9) forms an annular resonant cavity, and the third end of the output coupler (10) is connected with an output head (11) to serve as a laser output end.
3. The ring cavity 1270nm raman laser based on a phosphorus doped fiber and 1087nm pump laser according to claim 1, wherein: the pump laser (1) is a semiconductor laser, the central wavelength of the pump laser (1) is 980nm, and the energy output by the pump laser (1) is absorbed by the ytterbium-doped optical fiber (4) and forms population inversion.
4. The ring cavity 1270nm raman laser based on a phosphorus doped fiber and 1087nm pump laser according to claim 1, wherein: the high-reflection grating (2) and the low-reflection grating (5) form a resonant cavity, the high-reflection grating (2) is a fiber chirped Bragg grating, the reflectivity of the fiber chirped Bragg grating is 99.9%, the wavelength of a working center is 1087nm, the bandwidth of the fiber chirped Bragg grating is less than 2nm, 15-degree cutting is carried out on the output end, and laser in the reflective cavity is prevented.
5. The ring cavity 1270nm raman laser based on a phosphorus doped fiber and 1087nm pump laser according to claim 1, wherein: the ytterbium-doped optical fiber (4) is a gain optical fiber, the core diameter is 10/130 μm, the length is 5m, and population inversion is formed in the cavity after being pumped by a 980nm pump laser to obtain 1087nm laser.
6. The ring cavity 1270nm Raman laser based on the P-doped fiber and 1087nm pump laser according to claim 1, wherein said low reflection grating (5) is a fiber chirped Bragg grating having a reflectivity of 20% and a working center wavelength of 1087nm, and forms a resonant cavity together with said high reflection grating (2).
7. The ring-cavity 1270nm Raman laser based on the phosphorus-doped fiber and the 1087nm pump laser according to claim 1, wherein the independent isolator (6) is a 1087nm independent isolator which is used for ensuring that the 1087nm laser generated in the resonant cavity passes through the pump phosphorus-doped fiber (9) in a unidirectional manner to generate the 1270nm laser, and the laser cannot pass through light in a reverse direction, so that the laser is prevented from being reflected back to the resonant cavity consisting of the high-reflection grating (2) and the low-reflection grating (5).
8. The ring cavity 1270nm Raman laser based on the phosphorus-doped fiber and 1087nm pump laser according to claim 1, wherein said wavelength division multiplexer (7) is an 1087/1130-1300nm broadband wavelength division multiplexer, and its input end is 1087nm laser.
9. The ring cavity 1270nm Raman laser based on the P-doped fiber and the 1087nm pump laser according to claim 1, wherein the polarization controller (8) is in a three-piece coil type for adjusting birefringence in the ring cavity to generate 1270nm laser.
10. The ring-cavity 1270nm Raman laser based on the phosphorus-doped fiber and the 1087nm pump laser according to claim 1, wherein the length of the phosphorus-doped fiber (9) is 200m, and the phosphorus-doped fiber is used as a Raman fiber to generate 1270nm laser after being pumped by the 1087nm laser.
11. The ring cavity 1270nm raman laser based on a phosphorus doped fiber and 1087nm pump laser according to claim 1, wherein: the output coupler (10) is a 1270nm output coupler, the coupling ratio is 50:50, the working wavelength is 1270nm, 1270nm laser generated by output from the output head (11) end is connected with the output head (11) end as a main output port.
12. The use of the ring cavity 1270nm Raman laser based on the phosphorus-doped fiber and 1087nm pump laser according to claim 1 in the fields of surgical medicine and laser therapy and physiotherapy.
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| CN202111436390.3A CN114597738A (en) | 2021-11-30 | 2021-11-30 | Annular cavity 1270nm Raman laser based on phosphorus-doped optical fiber and 1087nm pump laser |
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| CN202111436390.3A CN114597738A (en) | 2021-11-30 | 2021-11-30 | Annular cavity 1270nm Raman laser based on phosphorus-doped optical fiber and 1087nm pump laser |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115296132A (en) * | 2022-10-09 | 2022-11-04 | 武汉中科锐择光电科技有限公司 | High-spectral-purity polarization-maintaining fiber Raman laser generation system |
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2021
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115296132A (en) * | 2022-10-09 | 2022-11-04 | 武汉中科锐择光电科技有限公司 | High-spectral-purity polarization-maintaining fiber Raman laser generation system |
| CN115296132B (en) * | 2022-10-09 | 2023-02-14 | 武汉中科锐择光电科技有限公司 | High spectral purity polarization maintaining optical fiber Raman laser generation system |
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Application publication date: 20220607 |