CN110994340A - 2-micron double-cone filtering tunable mode-locked fiber laser - Google Patents
2-micron double-cone filtering tunable mode-locked fiber laser Download PDFInfo
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- CN110994340A CN110994340A CN201911005675.4A CN201911005675A CN110994340A CN 110994340 A CN110994340 A CN 110994340A CN 201911005675 A CN201911005675 A CN 201911005675A CN 110994340 A CN110994340 A CN 110994340A
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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
- H01S3/11—Mode locking; Q-switching; Other giant-pulse techniques, e.g. cavity dumping
- H01S3/1106—Mode locking
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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
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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
- H01S3/08018—Mode suppression
- H01S3/08022—Longitudinal modes
- H01S3/08027—Longitudinal modes by a filter, e.g. a Fabry-Perot filter is used for wavelength setting
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Abstract
The invention claims a 2-micron double-cone filtering tunable mode-locked fiber laser, belonging to the field of laser technology and nonlinear optics. The optical fiber coupler mainly comprises a laser pumping source, a beam combiner, a gain optical fiber, a double-cone filter, an isolator, a coupler, a standard single-mode optical fiber and the like. According to the invention, a thulium-doped or thulium-holmium-doped optical fiber is used as a gain medium, a graphene and other material type saturable absorber covers or wraps a tapered optical fiber prepared by one tapering machine in a double-cone to form a passive mode-locking device, and the double-cone filter is manufactured by a welding machine and the tapering machine. The invention adopts the structure that the double-cone filter is combined with the saturable absorber, thereby realizing mode-locked pulse, realizing tunable wavelength, having the advantages of simple structure, low price, high integration level and the like, and being easy to realize industrialized application.
Description
Technical Field
The invention belongs to the technical field of fiber lasers, and particularly relates to a 2-micrometer double-cone filtering tunable mode-locked fiber laser.
Background
The mode-locked pulse fiber laser has the advantages of high peak power, short pulse duration, wide frequency spectrum bandwidth and the like. The wavelength of the pulse laser source needs to be selected in the fields of optical communication, astronomy, biomedicine, optical measurement and the like, so that the tunable mode-locked fiber laser has great significance in the research of the tuning characteristics. In order to realize the tunable fiber laser, many methods have been studied, such as dielectric thin film interference type filtering, bragg fiber grating filtering, acousto-optic tunable filtering, Lyot filtering, etc., but these methods have the problems of inconvenient operation, complex structure and high cost. In contrast, the biconical filter is a novel tunable filter which is easy to operate, low in price and simple in structure, one of the tapered fibers and a saturable absorber material are combined to serve as a mode locking device, the tunable mode locking fiber laser is realized, huge application value is shown, and industrialization is easy to realize.
Disclosure of Invention
The present invention is directed to solving the above problems of the prior art. A tunable mode-locked fiber laser with 2-micron biconical filtering is provided. The technical scheme of the invention is as follows:
a tunable mode-locked fiber laser with 2-micron double-cone filtering comprises a laser pumping source (1), a beam combiner (2), a gain fiber (3), an isolator (4), a double-cone filter (5), a first cone fiber (6), a second cone fiber (7), a material type saturable absorber (8), an output coupler (9) and a standard single-mode fiber (10), wherein the output end of the laser pumping source (1) is connected with the input end of the beam combiner (2), the output end of the beam combiner (2) is connected with one end of the gain fiber (3), the other end of the gain fiber (3) is connected with one end of the isolator (4), the other end of the isolator (4) is connected with the input end of the double-cone filter (5), the output end of the double-cone filter (5) is connected with one end of the output coupler (9), the output end of the output coupler (9) is provided with two paths, and one path of the two paths of the output paths, the other path is connected with the signal end of the beam combiner (2);
the laser pump source (1) is used for generating laser, the beam combiner (2) is used for coupling pump laser into an annular cavity, the gain fiber (3) is used for generating thulium-doped, thulium-holmium-doped or holmium-doped 2-micron laser, the isolator (4) is used for ensuring unidirectional optical transmission, the double-cone filter (5) is composed of two tapered fibers (6) and (7), the filter excites a high-order mode or a cladding mode in the fiber by using a fiber tapering method, the excited modes have different transmission constants compared with a basic mode, interference can be generated when the modes meet again after passing through the same-length fibers, and then a Mach-Zehnder interference type filter is formed. The combination of the tapered optical fiber, the material type and the saturable absorber can also be used as a mode locking device, the absorption degree of different materials to the evanescent field of the tapered waist part of the optical fiber is mainly used for reflecting external information, and the modulation of the evanescent field to light by the mode locking device is consistent. Under the same optical fiber, a first conical optical fiber (6) is prepared by a fusion splicer through electric discharge heating, a second conical optical fiber (7) is prepared by an oxyhydrogen flame heating method, a material type saturable absorber (8) covers or wraps the material type saturable absorber including graphene on the conical optical fiber (7) to form a mode locking device, and a coupler (9) is used for distributing power, wherein the first conical optical fiber (6) is prepared by a fusion splicer through electric discharge heating, the second conical optical fiber (7) is prepared by an oxyhydrogen flame heating method, the material
The output end of the laser pumping source (1) is connected with the input end of the beam combiner (2), the output end of the beam combiner (2) is connected with one end of the gain optical fiber (3), the other end of the gain optical fiber (3) is connected with one end of the isolator (4), the other end of the isolator (4) is connected with the input end of the double-cone filter (5), the output end of the double-cone filter (5) is connected with one end of the output coupler (9), the output end of the output coupler (9) is provided with two paths, one path is used as the output end of the optical fiber laser, and the other path is connected with the signal end of the beam combiner (2).
Further, the laser pump source (1) is a 793nm, 1210nm, 1550nm or 2000nm laser.
Further, the double-cone filter (5) is an optical fiber filter based on the principle of interference between a core mode and a cladding mode of a transmission optical fiber, the double-cone filter (5) excites a high-order mode or a cladding mode in the optical fiber by using an optical fiber tapering method, the excited modes and the base mode have different transmission constants, and the excited modes meet with each other again after passing through the optical fibers with the same length to generate interference, so that the Mach-Zehnder interference type filter is formed.
Furthermore, the fixed second tapered optical fiber 7 forms a mode locking device by covering or wrapping the graphene material type saturable absorber 8, the mode locking device covers or wraps the beam waist part of the tapered optical fiber 7 prepared by the tapering machine by an external material, the absorption degree of different materials to the evanescent field of the tapered optical fiber cone waist part is utilized to reflect external information, the action degree of the mode locking device with the saturable absorber material can be improved by increasing the length and the strength of the evanescent field, and the mode locking device is further combined together. And further realizes the tunable mode-locking fiber laser with the 2-micron biconical filter.
Further, the method for tuning the wavelength of the tunable mode-locked fiber laser with 2-micron biconical filtering comprises the following steps:
and fixing the second tapered optical fiber (7) prepared by the tapering machine, and changing the external environment including stress and temperature of the first tapered optical fiber (6) prepared by the fusion splicer, so that the coupling efficiency between the modes is changed, the optical path difference of the double-tapered filter is changed, the transmission spectrum is changed accordingly, and the wavelength can be tuned.
The invention has the following advantages and beneficial effects:
1. the tunable optical fiber has the advantages that the double-cone filter is selected to be combined with the saturable absorber, so that the tunable wavelength of a 2-micron waveband can be realized, the mode-locked pulse can be realized, and the tunable optical fiber has the advantages of simple structure, simplicity and convenience in operation, low cost and the like. The problems that the traditional adjustable filter is complex in structure and more in used devices are solved.
2. The double-tapered optical fiber has advantages in the aspects of manufacturing process and loss control, the full-optical-fiber structure of the laser is realized, and the mode of covering and wrapping the tapered optical fiber is adopted, so that the mode locking performance of materials such as graphene is greatly expanded.
3. The invention adopts a full-fiber structure, can replace a tuning fiber laser with a traditional space structure, has strong ring mirror interference resistance and low manufacturing cost, and can realize industrialized production.
Drawings
Fig. 1 is a schematic structural view of the principle of the preferred embodiment provided by the preferred embodiment of the present invention.
The labels in the figure are: 1. a laser pumping source, 2, a beam combiner, 3, a gain fiber, 4, an isolator, 5, a double-cone filter, 6, a tapered fiber prepared by a fusion splicer, 7, a tapered fiber prepared by a tapering splicer, 8, a material type saturable absorber, 9, an output coupler, 10 and a standard single-mode fiber
Detailed Description
The technical solutions in the embodiments of the present invention will be described in detail and clearly with reference to the accompanying drawings. The described embodiments are only some of the embodiments of the present invention.
The technical scheme for solving the technical problems is as follows:
as shown in fig. 1, an all-fiber thulium-doped mode-locked fiber laser with tunable wavelength adopts a ring cavity structure as shown in fig. 1, which mainly includes: the central wavelength is near 793nm, and the laser pumping source with the maximum power of 12W is output; the optical fiber coupler comprises a (2+1) multiplied by 1 type beam combiner with an operating waveband of 793/2000nm, a double-cladding thulium-doped optical fiber, an isolator, a self-made double-cone filter, a graphene saturable absorber wrapping a tapered optical fiber, an output coupler with a splitting ratio of 70:30 and an SMF28e common single-mode optical fiber. Wherein: the laser pumping source is connected with the input end of the beam combiner, the output end of the beam combiner is connected with one end of the gain optical fiber, the other end of the gain optical fiber is connected with the input end of the isolator, the other end of the isolator is connected with the input end of the double-cone filter, the output end of the double-cone filter is connected with the input end of the 70:30 output coupler, the output end of the 70:30 output coupler is provided with two paths, one path is used as the output end of the optical fiber laser, and the other path is connected with the signal end of the.
The double-cone filter is made up of ordinary single-mode optical fibre through removing its coating, preparing one conic optical fibre by oxyhydrogen flame heating method and preparing another conic optical fibre by fusion splicer discharge heating method. The tapered optical fiber prepared by the oxygen flame heating method is fixed in position and is combined with graphene to serve as a mode locking device, and the tapered optical fiber prepared by the other fusion splicer discharging method is used for changing external environments (stress, temperature and the like) and achieving wavelength adjustability.
The above examples are to be construed as merely illustrative and not limitative of the remainder of the disclosure. After reading the description of the invention, the skilled person can make various changes or modifications to the invention, and these equivalent changes and modifications also fall into the scope of the invention defined by the claims.
Claims (5)
1. A tunable mode-locked fiber laser with 2-micron double-cone filtering is characterized by comprising a laser pumping source (1), a beam combiner (2), a gain fiber (3), an isolator (4), a double-cone filter (5), a first cone fiber (6), a second cone fiber (7), a material type saturable absorber (8), an output coupler (9) and a standard single-mode fiber (10), wherein the output end of the laser pumping source (1) is connected with the input end of the beam combiner (2), the output end of the beam combiner (2) is connected with one end of the gain fiber (3), the other end of the gain fiber (3) is connected with one end of the isolator (4), the other end of the isolator (4) is connected with the input end of the double-cone filter (5), the output end of the double-cone filter (5) is connected with one end of the output coupler (9), and the output end of the output coupler (9) is provided with two paths, one path is taken as the output end of the optical fiber laser, and the other path is connected with the signal end of the beam combiner (2);
the laser pumping source (1) is used for generating laser, the beam combiner (2) is used for coupling pumping laser into the annular cavity, the gain fiber (3) is used for generating thulium-doped, thulium-holmium-doped or holmium-doped 2-micron laser, the isolator (4) is used for ensuring unidirectional optical transmission, the double-cone filter (5) is composed of two tapered fibers (6) and (7), the filter excites a high-order mode or a cladding mode in the fiber by using a fiber tapering method, the excited modes have different transmission constants compared with a basic mode, interference can be generated when meeting the same length of the fiber again, a Mach-Zehnder interference type filter is further formed, when the gain in the cavity exceeds the total loss in the cavity, comb peaks of the light in the round-trip process in the cavity of the fiber are selectively amplified to form laser output, wherein the combination of the tapered fiber and a saturated absorber can also be used as a mode locking device, the absorption degree of different materials to the evanescent field of the taper waist part of the optical fiber is mainly used for reflecting external information, and the absorption degree is consistent with the modulation of the mode locking device to light. Under the same optical fiber, a first conical optical fiber (6) is prepared by a fusion splicer through electric discharge heating, a second conical optical fiber (7) is prepared by an oxyhydrogen flame heating method, a material type saturable absorber (8) is formed by covering or wrapping a material including graphene on the conical optical fiber (7) to form a mode locking device, and a coupler (9) is used for distributing power, wherein the first conical optical fiber (6) is prepared by a fusion splicer through electric discharge heating, the second conical optical fiber (7) is prepared by an oxyhydrogen flame heating method
The output end of the laser pumping source (1) is connected with the input end of the beam combiner (2), the output end of the beam combiner (2) is connected with one end of the gain optical fiber (3), the other end of the gain optical fiber (3) is connected with one end of the isolator (4), the other end of the isolator (4) is connected with the input end of the double-cone filter (5), the output end of the double-cone filter (5) is connected with one end of the output coupler (9), the output end of the output coupler (9) is provided with two paths, one path is used as the output end of the optical fiber laser, and the other path is connected with the signal end of the beam combiner (2).
2. The tunable mode-locked fiber laser with 2-micron biconic filter according to claim 1, wherein the laser pump source (1) is a 793nm, 1210nm, 1550nm or 2000nm laser.
3. The tunable mode-locked fiber laser with 2-micrometer double-cone filtering according to claim 1, wherein the double-cone filter (5) is a fiber filter based on the principle of interference between core modes and cladding modes of a transmission fiber, the double-cone filter (5) excites the middle-high order modes or cladding modes of the fiber by using a fiber tapering method, the excited modes have different transmission constants with the base modes, and after passing through the same length of the fiber, the mode-locked fiber laser meets the base modes again to generate interference, so that a Mach-Zehnder interference type filter is formed.
4. The tunable mode-locked fiber laser with 2-micrometer double-cone filtering according to claims 1-3, characterized in that the fixed second tapered fiber (7) forms a mode-locking device by covering or wrapping the saturable absorber (8) made of graphene material, the beam waist part of the tapered fiber (7) prepared by the tapering machine is covered or wrapped by external material, the absorption degree of different materials to the evanescent field of the tapered fiber waist part is utilized to reflect external information, the action degree with the saturable absorber material can be improved by increasing the length and intensity of the evanescent field, and then the mode-locking device is combined together to be used as the mode-locking device, thereby realizing the tunable mode-locked fiber laser with 2-micrometer double-cone filtering.
5. The 2-micron biconic filter tunable mode-locked fiber laser of claim 3, wherein the wavelength of the 2-micron biconic filter tunable mode-locked fiber laser is tunable by the following method:
and fixing the second tapered optical fiber (7) prepared by the tapering machine, and changing the external environment including stress and temperature of the first tapered optical fiber (6) prepared by the fusion splicer, so that the coupling efficiency between the modes is changed, the optical path difference of the biconical filter is changed, the transmission spectrum is changed accordingly, and the wavelength can be tuned.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113131317A (en) * | 2021-03-03 | 2021-07-16 | 长春理工大学 | Tunable mode-locked fiber laser based on single-mode double-eccentric-core structure and control method |
| CN114498267A (en) * | 2022-01-27 | 2022-05-13 | 厦门大学 | Multi-wavelength high-repetition-frequency output tapered optical fiber, manufacturing method thereof and mode-locked laser |
| CN115693372A (en) * | 2023-01-05 | 2023-02-03 | 济南邦德激光股份有限公司 | Fiber laser capable of suppressing Raman scattering and method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN114498267A (en) * | 2022-01-27 | 2022-05-13 | 厦门大学 | Multi-wavelength high-repetition-frequency output tapered optical fiber, manufacturing method thereof and mode-locked laser |
| CN115693372A (en) * | 2023-01-05 | 2023-02-03 | 济南邦德激光股份有限公司 | Fiber laser capable of suppressing Raman scattering and method |
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Application publication date: 20200410 |