CN103149628A - Micro-tapered fiber for producing ultra-narrow linewidth fiber laser, and laser - Google Patents
Micro-tapered fiber for producing ultra-narrow linewidth fiber laser, and laser Download PDFInfo
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- CN103149628A CN103149628A CN2013100692421A CN201310069242A CN103149628A CN 103149628 A CN103149628 A CN 103149628A CN 2013100692421 A CN2013100692421 A CN 2013100692421A CN 201310069242 A CN201310069242 A CN 201310069242A CN 103149628 A CN103149628 A CN 103149628A
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Abstract
The invention relates to a micro-tapered fiber for producing an ultra-narrow linewidth fiber laser. The micro-tapered fiber is produced by ordinary single-mode fibers through a tapering process. A plurality of tapering regions are formed on the ordinary single-mode fibers through multiple tapering operations, and the whole micro-tapered fiber is connected into the laser, so that the length of a resonant cavity of the laser is more than or equal to 80m; the tapering regions on the ordinary single-mode fibers can effectively suppress the Brillouin gain and ensure the stability of single-frequency operation of the laser, and meanwhile, the large-length resonant cavity can meet the requirement of vast accumulation of Rayleigh gain and improve the signal strength. The micro-tapered fiber provided by the invention has the beneficial technical effects that the single-frequency operation of the laser is ensured, and meanwhile, the accumulation of Rayleigh gain can be effectively realized, and the output signal strength is improved; the tuning range is unrelated to the matching of the pumping wavelength and the length of the laser cavity, and additional linewidth compression is not needed; and the structure is simple, the implementation is easy, and the fiber is a novel narrow-linewidth light source.
Description
Technical field
The present invention relates to a kind of laser instrument, relate in particular to a kind of little tapered fiber and laser instrument for making the super-narrow line width fiber laser.
Background technology
The super-narrow line width fiber laser becomes an important development direction in present fiber laser with its distinctive low phase noise characteristic, and it is widely used in distributing optical fiber sensing and interference-type optical fiber sensor-based system, to reduce noise, improves detection sensitivity.
The mode that realizes at present the output of fiber laser single mode narrow linewidth mainly contains short cavity method, ring cavity method and stimulated scattering fiber laser.wherein, it is that the Er-doped fiber of high-dopant concentration of several centimetres is as gain media that the short cavity method generally adopts length, the narrow linewidth fiber grating is as the laser chamber mirror, although its structure is simple, but realize very difficult, at first, the length of Er-doped fiber is very short, its doping content is restive, doping content is too low, the gain that optical fiber produces does not reach the needed gain of laser instrument far away, doping content is too high, cancellation easily occurring again now looks like, the short cavity method also requires fiber grating three dB bandwidth less than 0.03nm in addition, processing technology to fiber grating has proposed higher requirement, realize that difficulty is larger.When adopting the ring cavity method, the output efficiency of laser instrument is lower, though adopted the means that increase doped fiber length to improve output power in prior art, makes again the frequency stability of laser instrument reduce simultaneously.Fiber laser based on Brillouin scattering, its Output of laser exists the frequency displacement of 11GHz, and due to brillouin gain broader bandwidth in optical fiber (20MHz left and right), optical fiber can not be oversize, in order to avoid have a plurality of zlasing modes in brillouin gain spectral limit (20MHz), the random mode hopping of final formation is picture now, and can't realize stable single-frequency operation, simultaneously, owing to limited by fiber lengths, be not easy to form the gain accumulation in resonator cavity, signal a little less than, be unfavorable for using.
Summary of the invention
For the problem in background technology, the present invention proposes a kind of little tapered fiber for making the super-narrow line width fiber laser, described little tapered fiber by general single mode fiber through drawing cone technique to be made: by repeatedly drawing cone operation, make and form a plurality of cone districts of drawing on general single mode fiber; In the whole access of described little tapered fiber laser instrument, make the cavity length of laser instrument more than or equal to 80m; A plurality of on general single mode fiber draw the cone district can effectively suppress brillouin gain, guarantee the stability of laser instrument single-frequency operation, and simultaneously, the resonator cavity of big-length can satisfy the needs of a large amount of accumulations of Rayleigh gain, improves signal intensity.
Its ultimate principle is: the numerical aperture of optical fiber is a limited value, and therefore, general single mode fiber allows the conduction of multimode sound wave; Because light can be by the scattering of the sound wave of non-zero angle institute, if angle is enough little, scattered light still can be propagated in the middle of general single mode fiber; And in general single mode fiber, the transverse gradients of light field is far longer than vertical gradient of light field, therefore transverse sound wave plays vital effect to excited Brillouin, its unique structure of little tapered fiber of the present invention can function as follows: 1) enlarge the mould field distribution of light in optical fiber, reduce the transverse gradients of light field, indirectly suppress the transverse sound wave in optical fiber; 2) make optical fiber form variable section structure, destroy the conduction condition of transverse sound wave; 3) a plurality of cones that draw that are distributed on general single mode fiber are distinguished the cumulative effect that can avoid the excited Brillouin gain.
The laser instrument that adopts the little tapered fiber of the present invention to make as resonator cavity, can avoid adopting the laser instrument of brillouin gain principle because existing random mode hopping now as causing the unsettled problem of single-frequency operation, eliminated simultaneously the restriction for cavity length, make resonator cavity can reach hundred meters magnitudes, effectively realize Rayleigh gain accumulation, improve signal intensity.
Based on aforementioned schemes, the present invention has also proposed the following preferred parameter plan of establishment for the axial length that draws cone to distinguish: the single axial length that draws cone to distinguish is 1.5 ~ 2cm; Draw the axial length in cone district to choose in this scope, can make loss and the little tapered fiber of light in little tapered fiber obtain better balance to the inhibition of brillouin gain.
If draw the spacing distance of boring between the district too small, can make the loss of light in little tapered fiber excessive, if and draw the spacing distance between cone district excessive, can cause again little tapered fiber not obvious to the inhibition of brillouin gain accumulation, for drawing the spacing distance of boring between the district, the inventor has proposed following preferred version: in order to simplify manufacture craft through after great many of experiments, each is drawn bore spaced set between the district, adjacent two are drawn interval 4 ~ 6m between the axial centre of boring the district.
Minimum diameter for drawing the cone district the invention allows for following preferred version: the ratio that draws cone to distinguish between the external diameter numerical value of interior minimum diameter numerical value and general single mode fiber is chosen between 24 ︰ 25 ~ 16 ︰ 25.Draw cone to distinguish interior minimum diameter numerical value too small, can reduce the percent of pass of light, draw the minimum diameter numerical value in cone district excessive, can cause the inhibition of brillouin gain again not obviously, the aforementioned parameters scope is that the inventor is arranging scope through the preferred parameter that sums up after great many of experiments.
Aforesaid preferred parameter draws cone technique based on existing ripe optical fiber, adopts ordinary optic fibre to draw cone equipment to realize, adds only to should be noted man-hour to avoid optical fiber is broken and get final product.
The invention allows for a kind of super-narrow line width fiber laser that adopts aforementioned little tapered fiber to be made, it is comprised of pumping source, wavelength division multiplexer, Er-doped fiber section, adjustable narrow-band wave filter, 1 * 2 coupling mechanism, Polarization Controller, three-port circulator, little tapered fiber section, variable optical attenuator and faraday's catoptron;
pumping source is connected with the first input end light path of wavelength division multiplexer, the output terminal of wavelength division multiplexer is connected with the input end light path of Er-doped fiber section, the output terminal of Er-doped fiber section is connected with the input end light path of adjustable narrow-band wave filter, the output terminal of adjustable narrow-band wave filter is connected with the input end light path of 1 * 2 coupling mechanism, the first output terminal of 1 * 2 coupling mechanism is connected with the input end light path of Polarization Controller, the second output terminal of 1 * 2 coupling mechanism is used for Laser output, the output terminal of Polarization Controller is connected with the input end light path of three-port circulator, the multiplexing end of the transmitting-receiving of three-port circulator is connected with an end light path of little tapered fiber section, the other end of little tapered fiber section is connected with variable optical attenuator, variable optical attenuator is connected with faraday's catoptron, the output terminal of three-port circulator is connected with the second input end light path of wavelength division multiplexer, described little tapered fiber by general single mode fiber through drawing cone technique to be made: by repeatedly drawing cone operation, make and form a plurality of cone districts of drawing on general single mode fiber, in the whole access of described little tapered fiber laser instrument, make the cavity length of laser instrument more than or equal to 80m.
The principle of work of this super-narrow line width fiber laser is: pumping source by wavelength division multiplexer with the Er-doped fiber section from the low-lying level pumping to high level, thereby a wideband light source is provided; The adjustable narrow-band wave filter determines the output wavelength of laser instrument as the wavelength selectors; The second output terminal of 1 * 2 coupling mechanism is used for Output of laser, and the first output terminal of 1 * 2 coupling mechanism is used for ring cavity is returned in optically-coupled; Polarization Controller is used for regulating the polarization state of controlling ring cavity laser; Polarization Controller is connected with the input end light path of three-port circulator, the multiplexing end of the transmitting-receiving of three-port circulator connects little tapered fiber section, variable optical attenuator and faraday's catoptron successively, the output terminal of three-port circulator is connected with the wavelength division multiplexer light path, thereby forms complete loop laser chamber.The effect of variable optical attenuator and faraday's catoptron is to provide a very faint seed light, variable optical attenuator is controlled the seed light intensity, be submerged with the backward Rayleigh signal of avoiding narrow linewidth, thereby increase the probability that back scattering produces, the Rayleigh scattering light of narrow linewidth circulates in ring cavity, narrow linewidth, high-intensity laser signal are outwards exported in final formation laser generation.
Useful technique effect of the present invention is: when guaranteeing the laser instrument single-frequency operation, can effectively realize Rayleigh gain accumulation, improve output signal strength, whether its tunable range and pumping wavelength and laser chamber length mate irrelevant, needn't carry out extra live width compression, simple in structure, be easy to realize, be a kind of novel narrow linewidth light source.
Description of drawings
Fig. 1, little tapered fiber structural representation;
Fig. 2, super-narrow line width optical fiber laser structure schematic diagram (in figure, port shown in mark A is the second output terminal of 1 * 2 coupling mechanism, is also laser output).
Embodiment
A kind of little tapered fiber for making the super-narrow line width fiber laser, described little tapered fiber by general single mode fiber through drawing cone technique to be made: by repeatedly drawing the cone operation, make to form a plurality of cones that draw on general single mode fiber and distinguish 8-1; In the whole access of described little tapered fiber laser instrument, make the cavity length of laser instrument more than or equal to 80m, a plurality of cone district 8-1 that draw on general single mode fiber can effectively suppress brillouin gain, guarantee the stability of laser instrument single-frequency operation, simultaneously, the resonator cavity of big-length can satisfy the needs of a large amount of accumulations of Rayleigh gain, improves signal intensity.
The single axial length (seeing scope shown in label L in Fig. 1) that draws cone to distinguish 8-1 is 1.5 ~ 2cm.
Each draws spaced set between cone district 8-1, and adjacent two are drawn interval (seeing scope shown in mark M in Fig. 1) 4 ~ 6m between the axial centre of boring district 8-1.
The ratio that draws cone to distinguish between the external diameter numerical value of the interior minimum diameter numerical value of 8-1 and general single mode fiber is chosen between 24 ︰ 25 ~ 16 ︰ 25.
A kind of super-narrow line width fiber laser, it is comprised of pumping source 1, wavelength division multiplexer 2, Er-doped fiber section 3, adjustable narrow- band wave filter 4,1 * 2 coupling mechanism 5, Polarization Controller 6, three-port circulator 7, little tapered fiber section 8, variable optical attenuator 9 and faraday's catoptron 10;
Claims (5)
1. little tapered fiber of be used for making the super-narrow line width fiber laser, it is characterized in that: described little tapered fiber by general single mode fiber through drawing cone technique to be made: by repeatedly drawing cone operation, make and form a plurality of cone districts (8-1) of drawing on general single mode fiber; In the whole access of described little tapered fiber laser instrument, make the cavity length of laser instrument more than or equal to 80m; A plurality of cone districts (8-1) of drawing on general single mode fiber can effectively suppress brillouin gain, guarantee the stability of laser instrument single-frequency operation, and simultaneously, the resonator cavity of big-length can satisfy the needs of a large amount of accumulations of Rayleigh gain, improves signal intensity.
2. require 1 described little tapered fiber for making the super-narrow line width fiber laser according to claim, it is characterized in that: the single axial length that draws cone to distinguish (8-1) is 1.5 ~ 2cm.
3. require 1 described little tapered fiber for making the super-narrow line width fiber laser according to claim, it is characterized in that: each draws spaced set between cone district (8-1), and adjacent two are drawn interval 4 ~ 6m between the axial centre of boring district (8-1).
4. require 1 described little tapered fiber for making the super-narrow line width fiber laser according to claim, it is characterized in that: the ratio that draws cone to distinguish between the external diameter numerical value of (8-1) interior minimum diameter numerical value and general single mode fiber is chosen between 24 ︰ 25 ~ 16 ︰ 25.
5. super-narrow line width fiber laser, it is characterized in that: it is comprised of pumping source (1), wavelength division multiplexer (2), Er-doped fiber section (3), adjustable narrow-band wave filter (4), 1 * 2 coupling mechanism (5), Polarization Controller (6), three-port circulator (7), little tapered fiber section (8), variable optical attenuator (9) and faraday's catoptron (10);
pumping source (1) is connected with the first input end light path of wavelength division multiplexer (2), the output terminal of wavelength division multiplexer (2) is connected with the input end light path of Er-doped fiber section (3), the output terminal of Er-doped fiber section (3) is connected with the input end light path of adjustable narrow-band wave filter (4), the output terminal of adjustable narrow-band wave filter (4) is connected with the input end light path of 1 * 2 coupling mechanism (5), the first output terminal of 1 * 2 coupling mechanism (5) is connected with the input end light path of Polarization Controller (6), the second output terminal of 1 * 2 coupling mechanism (5) is used for Laser output, the output terminal of Polarization Controller (6) is connected with the input end light path of three-port circulator (7), the multiplexing end of transmitting-receiving of three-port circulator (7) is connected with an end light path of little tapered fiber section (8), the other end of little tapered fiber section (8) is connected with variable optical attenuator (9), variable optical attenuator (9) is connected with faraday's catoptron (10), the output terminal of three-port circulator (7) is connected with the second input end light path of wavelength division multiplexer (2),
Described little tapered fiber by general single mode fiber through drawing cone technique to be made: by repeatedly drawing cone operation, make and form a plurality of cone districts (8-1) of drawing on general single mode fiber; In the whole access of described little tapered fiber laser instrument, make the cavity length of laser instrument more than or equal to 80m.
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Cited By (14)
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| CN103490272A (en) * | 2013-09-11 | 2014-01-01 | 上海交通大学 | 2um single frequency pulse fiber laser adjustable in amplitude modulation frequency |
| CN103794975A (en) * | 2014-02-19 | 2014-05-14 | 重庆大学 | Ultra-narrow linewidth annular fiber laser based on linear rayleigh scattering and self-feedback |
| CN103928834A (en) * | 2014-04-25 | 2014-07-16 | 北京交通大学 | Ultra-narrow line-width FDML ring-shaped laser based on SOA |
| CN105720468A (en) * | 2016-04-07 | 2016-06-29 | 浙江师范大学 | Multi-wavelength narrow linewidth laser output method based on micro-groove fiber |
| CN105762644A (en) * | 2016-04-07 | 2016-07-13 | 浙江师范大学 | Micro groove fiber-based narrow linewidth laser output method |
| CN105762645A (en) * | 2016-04-07 | 2016-07-13 | 浙江师范大学 | Micro-groove optical fiber-based tunable narrow linewidth laser output method |
| CN105958314A (en) * | 2016-06-23 | 2016-09-21 | 华中科技大学 | Single-longitudinal mode narrow linewidth Brillouin laser |
| CN106654833A (en) * | 2017-03-15 | 2017-05-10 | 重庆大学 | Wavelength-tunable narrow linewidth laser based on graphene Bragg grating |
| CN107069403A (en) * | 2017-06-08 | 2017-08-18 | 电子科技大学 | Based on cascade draw cone fluoride fiber it is tunable in infrared mode locked fiber laser |
| CN107785771A (en) * | 2017-10-27 | 2018-03-09 | 西安深瞳智控技术有限公司 | A kind of Dan Zong for improving wavelength delivery efficiency touches multi-wavelength tunable Optical Maser System and method |
| CN108683064A (en) * | 2018-07-20 | 2018-10-19 | 中国人民解放军国防科技大学 | All-fiber laser oscillator based on fiber core size longitudinal gradient gain fiber |
| CN110635347A (en) * | 2019-08-12 | 2019-12-31 | 华中科技大学鄂州工业技术研究院 | Reducing optical fiber and all-fiber laser oscillator based on same |
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| CN103490272A (en) * | 2013-09-11 | 2014-01-01 | 上海交通大学 | 2um single frequency pulse fiber laser adjustable in amplitude modulation frequency |
| CN103794975A (en) * | 2014-02-19 | 2014-05-14 | 重庆大学 | Ultra-narrow linewidth annular fiber laser based on linear rayleigh scattering and self-feedback |
| CN103794975B (en) * | 2014-02-19 | 2016-05-18 | 重庆大学 | Super-narrow line width annular optical fiber laser based on linear pattern Rayleigh scattering and self feed back |
| CN103928834B (en) * | 2014-04-25 | 2016-08-24 | 北京交通大学 | A kind of super-narrow line width FDML ring laser based on SOA |
| CN103928834A (en) * | 2014-04-25 | 2014-07-16 | 北京交通大学 | Ultra-narrow line-width FDML ring-shaped laser based on SOA |
| CN105720468B (en) * | 2016-04-07 | 2018-11-02 | 浙江师范大学 | Multi-wavelength narrow-linewidth laser output method based on micro groove optical fiber |
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| CN105762645A (en) * | 2016-04-07 | 2016-07-13 | 浙江师范大学 | Micro-groove optical fiber-based tunable narrow linewidth laser output method |
| CN105762645B (en) * | 2016-04-07 | 2018-11-27 | 浙江师范大学 | Tunable narrow-linewidth laser output method based on micro groove optical fiber |
| CN105720468A (en) * | 2016-04-07 | 2016-06-29 | 浙江师范大学 | Multi-wavelength narrow linewidth laser output method based on micro-groove fiber |
| CN105958314A (en) * | 2016-06-23 | 2016-09-21 | 华中科技大学 | Single-longitudinal mode narrow linewidth Brillouin laser |
| CN106654833A (en) * | 2017-03-15 | 2017-05-10 | 重庆大学 | Wavelength-tunable narrow linewidth laser based on graphene Bragg grating |
| CN107069403A (en) * | 2017-06-08 | 2017-08-18 | 电子科技大学 | Based on cascade draw cone fluoride fiber it is tunable in infrared mode locked fiber laser |
| CN107785771A (en) * | 2017-10-27 | 2018-03-09 | 西安深瞳智控技术有限公司 | A kind of Dan Zong for improving wavelength delivery efficiency touches multi-wavelength tunable Optical Maser System and method |
| CN107785771B (en) * | 2017-10-27 | 2023-07-04 | 西安深瞳智控技术有限公司 | Single-longitudinal-mode multi-wavelength tunable laser system and method for improving wavelength output efficiency |
| CN108683064A (en) * | 2018-07-20 | 2018-10-19 | 中国人民解放军国防科技大学 | All-fiber laser oscillator based on fiber core size longitudinal gradient gain fiber |
| CN108683064B (en) * | 2018-07-20 | 2023-11-21 | 中国人民解放军国防科技大学 | All-fiber laser oscillator based on fiber core size longitudinal gradual gain fiber |
| CN110635347A (en) * | 2019-08-12 | 2019-12-31 | 华中科技大学鄂州工业技术研究院 | Reducing optical fiber and all-fiber laser oscillator based on same |
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| CN113325517A (en) * | 2021-08-03 | 2021-08-31 | 中国工程物理研究院激光聚变研究中心 | Optical fiber end cap and optical fiber laser |
| CN113325517B (en) * | 2021-08-03 | 2021-10-15 | 中国工程物理研究院激光聚变研究中心 | Optical fiber end cap and optical fiber laser |
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