CN104617471B - A kind of accidental laser based on optical fiber planar end surface Fresnel reflection - Google Patents
A kind of accidental laser based on optical fiber planar end surface Fresnel reflection Download PDFInfo
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- CN104617471B CN104617471B CN201510038464.6A CN201510038464A CN104617471B CN 104617471 B CN104617471 B CN 104617471B CN 201510038464 A CN201510038464 A CN 201510038464A CN 104617471 B CN104617471 B CN 104617471B
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Abstract
A kind of accidental laser based on optical fiber planar end surface Fresnel reflection of the disclosure of the invention, is related to field of high power fiber lasers.The laser includes pump light source, wavelength division multiplexer, bandstop filter and single-mode fiber；Wherein wavelength division multiplexer has two input ports, an output port；The pump light of pumping source inputs wavelength division multiplexer by one of input port, another input port only allows single order stokes light to pass through, and connect the optical fiber that an end is planar end surface, the single order stokes light that lasing goes out inside optical fiber to reflected pump light；The output end of wavelength division multiplexer connects the input of bandstop filter by optical fiber, and the output end of bandstop filter connects a section single-mould fiber, and the end of this section of single mode light is angled end-face, is the output end of laser.So as to further increase single order Random Laser peak power output, obtain high power single order Random Laser of the light light conversion efficiency more than 80% and export.
Description
Technical field
This technology is related to field of high power fiber lasers, itself it is a technical advantage that simple in construction, without fiber grating or
Fiber optic loop speculum, high-power optical fiber random laser output, light light conversion efficiency can be produced>80%, and the structure is random
For laser based on the Ramam effect in optical fiber, it is wide that output laser may be selected wavelength band, can by select pumping wavelength obtain with
The single order Random Laser of its corresponding wavelength.
Background technology
Compared with traditional solid state laser, optical fiber laser has small volume, and beam quality is high, and heat management convenience etc. is excellent
Point.At present, advanced by leaps and bounds with mixing the output laser power of the high power rare earth ion doped optical fiber laser based on ytterbium.In optical fiber
Ramam effect as another important channel for obtaining optical-fiber laser, with Doped ions be excited amplification mode compared with, have
Broader gain bandwidth, and the laser output of various specific wavelengths can be obtained, receive much concern in recent years.Traditional Raman fiber laser
Device places speculum at optical fiber both ends, in order to obtain high-power output, needs the reflectivity and reflection of two speculums of fine optimization
Bandwidth.
Random-distribution feedback optical fiber laser is a kind of new no cavity optical fibre laser, and it differs structurally from tradition and swashed
Light device, it, which feeds back, derives from the back rayleigh scattering of random distribution rather than common resonator in optical fiber.Random distribution is fed back
Optical fiber laser obtains gain by the distributed Raman scattering effect in optical fiber, and stable, spatial independence company can be achieved
A kind of continuous laser output, it is considered to be important new light sources.It is high that one considerable advantage of optical fiber random laser device is that it is produced
The threshold value of rank stokes light is very high, therefore possesses the ability for producing high power single order Random Laser.However, common standard-sized sheet chamber knot
The output characteristics of the optical fiber random laser device of structure is highly susceptible to the influence of fiber-optic output methods of parasitic feedback, and theoretical simulation shows,
10-5The end face methods of parasitic feedback of magnitude will significantly change the power distribution of laser, reduce laser delivery efficiency and higher order laser
Lasing threshold, so as to limited in actual experiment its produce high power single order Random Laser power.Using partly beginning to speak to tie
The fiber Raman accidental laser of structure, point type feedback is introduced in optical fiber front end, higher order laser output and laser power can be achieved
Characteristic is insensitive to the methods of parasitic feedback of optical fiber tail-end, but before scheme using specific high reflectance Fiber Bragg Grating FBG or
Fiber optic loop speculum, its operation wavelength need to match Stokes wavelength corresponding to pumping.
The content of the invention
For above-mentioned prior art, propose that a kind of half-open cavity configuration based on optical fiber planar end surface broadband Fresnel reflection is efficient
Rate high-power fiber Raman accidental laser, and use short fiber chamber length (<1km), by being introduced only to one at pumped fiber end
Rank laser has the weak reflection (4%) of the fiber end face of feedback effect, can further increase single order Random Laser peak power output, obtain
To light light conversion efficiency>80% high power single order Random Laser output.
In order to solve the above-mentioned technical problem, the present invention adopts the following technical scheme that：
The solution of the present invention is a kind of accidental laser based on optical fiber planar end surface Fresnel reflection, the laser bag
Include pump light source (1), wavelength division multiplexer (3), bandstop filter (5) and single-mode fiber (6)；Wherein wavelength division multiplexer have two it is defeated
Inbound port (2), (9), an output port (4)；The pump light of pumping source inputs wavelength-division by one of input port (2) and answered
With device, another input port (9) only allows single order stokes light by and connecting the optical fiber that an end is planar end surface, using
The single order stokes light that lasing goes out inside optical fiber with reflected pump light；The output end of wavelength division multiplexer passes through optical fiber connect band
The input of wave filter (5) is hindered, the output end of bandstop filter connects a section single-mould fiber, the end of this section of single mode light (6)
For angled end-face, the end face reflection is less than 10-5, for the output end of laser.
The length of wherein described single-mode fiber (6) is less than 1 km；
Wherein described bandstop filter (5) is used to filter out second order of Stokes light.
The present invention has the advantages that compared with prior art：The present invention utilizes 4% Fresnel of optical fiber planar end surface (8)
Reflection is used as laser mirror, without the hysteroscopes such as the Fiber Bragg Grating FBG of particular job wavelength or fiber optic loop speculum, knot
Structure is very simple, insensitive to environment temperature, good operating stability；Optical fiber planar end surface (8) provides broadband reflection, random to single order
The effective reflectivity of laser changes less with the increase of laser power；Optical fiber planar end surface (8) provides broadband reflection, for difference
Pumping wavelength can provide feedback to its corresponding single order stokes light；Optical fiber planar end surface (8) provides broadband reflection, and it reflects
Rate is low (4%), can further increase single order Random Laser peak power output；Use short length single-mode fiber within 1km
(6) laser power profile, can be made to concentrate on optical fiber connector (7) output, so as to improve the delivery efficiency of laser；In laser cavity
Bandstop filter (5) is added, further increases the threshold value of second order Random Laser, swashs at random so as to obtain more powerful single order
Light output.
Brief description of the drawings
Fig. 1 is the high efficiency high-power fiber Raman accidental laser structure based on optical fiber planar end surface broadband Fresnel reflection
Schematic diagram
When Fig. 2 optical fiber front end reflections specular reflectivity is 0.04 and 0.9, single order optical fiber random laser power output is with pumping work(
The simulation result figure of the change of rate
When Fig. 3 optical fiber front end reflections specular reflectivity is 0.04 and 0.9, in the case of identical power output, single order optical fiber
The simulation result figure of the power distribution of Random Laser in a fiber
In Fig. 1：1. pumping source, the Single port of 2. wavelength division multiplexers, 3. wavelength division multiplexers, 4. wavelength division multiplexers it is public
End, 5. bandstop filters, 6. single-mode fibers, 7. optical fiber angled end-faces, 8. optical fiber planar end surfaces, the Two-port netwerk of 9. wavelength division multiplexers；
Embodiment
The present invention is elaborated below in conjunction with the accompanying drawings.
A kind of accidental laser based on optical fiber planar end surface Fresnel reflection, including pump light source (1), wavelength division multiplexer
WDM (3), bandstop filter (5) and single-mode fiber (6), it is characterised in that：The ripple of wavelength division multiplexer WDM (3) Single port (2)
The long wavelength corresponding to pump light source, pump light source (1) are coupled into single-mode optics by the Single port (2) of wavelength division multiplexer WDM (3)
In fine (6), bandstop filter (5) is accessed between wavelength division multiplexer WDM (3) common port (4) and single-mode fiber (6), so as to enter
One step increases the threshold value of second order Random Laser, and optical fiber connector (7) is angled end-face, and its end face reflection rate is less than 10-5, it is laser
Output port.Wavelength division multiplexer WDM (3) Two-port netwerk (9) end is optical fiber planar end surface (8), due to wavelength division multiplexer WDM (3)
Two-port netwerk (9) correspond to single order stokes light wavelength, so optical fiber planar end surface (8) be only single order Random Laser provide
4% broadband Fresnel reflection.
Fig. 2 is under numerical simulation, and when optical fiber front end reflection specular reflectivity is 0.04 and 0.9, single order optical fiber random laser is defeated
Going out change of the power with pump power, the end of input port (9) connection of wavelength division multiplexer of the present invention is the optical fiber of planar end surface,
The reflectivity of the transverse plane is 0.04, and background technology is in this place 0.9 using the reflectivity of reflective mirror.Wherein optical fiber front end is anti-
The situation that input-output curve when specular reflectivity is 0.04 corresponds to optical fiber planar end surface in the present invention is penetrated, fiber lengths are elected as
500m.It can be seen that using 4% Fresnel reflection of optical fiber planar end surface, high-power high-efficiency can be obtained in optical fiber tail-end
Single order Random Laser exports.After single order Random Laser threshold value is reached, output laser power increases rapidly, and the second order at lasing
Maximum single order Random Laser output is obtained during Random Laser.Compared to the situation of high reflectance (90%) speculum, although with
The threshold value of machine laser increased, but when using 4% Fresnel reflection of optical fiber planar end surface, can obtain bigger single order on the contrary
Random Laser peak power output.Finally, the Raman accidental laser of partly beginning to speak based on optical fiber planar end surface and 500m single-mode fibers
44.5W outputs can be achieved, light phototranstormation efficiency reaches 84% Random Laser output.
Fig. 3 is under numerical simulation, when optical fiber front end reflection specular reflectivity is 0.04 and 0.9, in the feelings of identical power output
Under condition, the power distribution of single order optical fiber random laser in a fiber.Selected fiber lengths are shorter (500m), laser power profile collection
In optical fiber connector (7) export.It is standard-sized sheet cavity configuration for second order Random Laser, so second order swashs at random under structure of the present invention
The threshold value of light is determined by the power distribution of single order Random Laser.As can be seen that in the case of identical power output, before optical fiber
When terminal reflector reflectivity is higher, the distribution of laser power more penetrates into inside of optical fibre, so as to be easier to excite produce second order with
Machine laser, so as to which obtainable maximum single order Random Laser output is smaller.So optical fiber Bragg light compared to high reflectance
Grid or fiber optic loop speculum, using 4% Fresnel reflection of optical fiber planar end surface, not only structure is simpler, is also more beneficial for obtaining
The single order Random Laser output of more power.
Claims (3)
1. a kind of accidental laser based on optical fiber planar end surface Fresnel reflection, the laser is multiple including pump light source (1), wavelength-division
With device (3), bandstop filter (5) and single-mode fiber (6)；Wherein wavelength division multiplexer has two input ports (2,9), an output
Port (4)；The pump light of pumping source inputs wavelength division multiplexer by one of input port (2), and another input port (9) is only
Single order stokes light is allowed by and the optical fiber that end is planar end surface being connected, to reflected pump light inside optical fiber
The single order stokes light that lasing goes out；The output end of wavelength division multiplexer connects the input of bandstop filter (5), band by optical fiber
The output end for hindering wave filter connects a section single-mould fiber, and the end of this section of single mode light (6) is angled end-face, and the end face reflection is less than
10-5, for the output end of laser.
A kind of 2. accidental laser based on optical fiber planar end surface Fresnel reflection as described in claim 1, it is characterised in that institute
The length for stating single-mode fiber (6) is less than 1 km.
A kind of 3. accidental laser based on optical fiber planar end surface Fresnel reflection as described in claim 1, it is characterised in that institute
Bandstop filter (5) is stated to be used to filter out second order of Stokes light.
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10522967B2 (en) | 2016-01-26 | 2019-12-31 | Fujikura Ltd. | Fiber laser system, fiber laser system production method, and processing method |
| JP6422454B2 (en) * | 2016-01-26 | 2018-11-14 | 株式会社フジクラ | Fiber laser system, manufacturing method, and processing method |
| CN105576486B (en) * | 2016-03-14 | 2018-06-08 | 电子科技大学 | The random fiber laser that a kind of Raman gain changes along fiber lengths |
| CN106770029B (en) * | 2016-11-16 | 2020-06-02 | 电子科技大学 | End-face type optical fiber refractive index sensor array measuring system and method |
| CN106549292A (en) * | 2017-01-19 | 2017-03-29 | 中国人民解放军国防科学技术大学 | A kind of high-power random fiber laser based on inclined optical fiber grating |
| CN107342818B (en) * | 2017-06-23 | 2020-04-24 | 国家电网公司信息通信分公司 | Self-driven method and system architecture for realizing Q factor optimization of high-order Raman system |
| CN113054520B (en) * | 2021-03-12 | 2021-10-26 | 中国人民解放军国防科技大学 | Pure visible light super-continuum spectrum light source based on semiconductor laser diode pumping |
| CN113314930A (en) * | 2021-05-24 | 2021-08-27 | 国网四川省电力公司经济技术研究院 | Optical fiber random laser based on band elimination filter array and distributed sensing system |
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| CN102354900A (en) * | 2011-11-09 | 2012-02-15 | 中国计量学院 | Random-distribution feedback optical fiber laser |
| CN103597675A (en) * | 2011-04-25 | 2014-02-19 | Ofs菲特尔有限责任公司 | Raman distributed feedback fiber laser and high power laser system using the same |
| CN104184038A (en) * | 2014-07-18 | 2014-12-03 | 浙江大学 | Er-doped optical fiber source and near-Gaussian spectrum output generating method thereof |
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| CN103597675A (en) * | 2011-04-25 | 2014-02-19 | Ofs菲特尔有限责任公司 | Raman distributed feedback fiber laser and high power laser system using the same |
| CN102354900A (en) * | 2011-11-09 | 2012-02-15 | 中国计量学院 | Random-distribution feedback optical fiber laser |
| CN104184038A (en) * | 2014-07-18 | 2014-12-03 | 浙江大学 | Er-doped optical fiber source and near-Gaussian spectrum output generating method thereof |
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| High Power Random Fiber Laser With Short Cavity Length: Theoretical and Experimental Investigations;Zinan Wang et al.;《IEEE Journal of Selected Topics in Quantum Electronics》;20140730;第21卷(第1期);正文第2节第1段，附图1、6 * |
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