CN103280690B - Realize the fiber laser of continuous light and pulsed light output - Google Patents
Realize the fiber laser of continuous light and pulsed light output Download PDFInfo
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- CN103280690B CN103280690B CN201310205711.8A CN201310205711A CN103280690B CN 103280690 B CN103280690 B CN 103280690B CN 201310205711 A CN201310205711 A CN 201310205711A CN 103280690 B CN103280690 B CN 103280690B
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Abstract
Realize a fiber laser for continuous light and pulsed light output, it comprises: the Transmission Fibers of a band feedback end; One ring flange, its one end is connected with Transmission Fibers; One gain fibre, its one end is connected with the other end of ring flange; One fiber grating, its input is connected with the other end of gain fibre; One wavelength division multiplexer, its C end is connected with the output of fiber grating, and the R end of this wavelength division multiplexer is output; Semiconductor laser, its output is held with the P of wavelength division multiplexer and is connected.Of the present invention to realize the fiber laser integrated level that continuous light and pulsed light export high, non-maintaining, is easy to realize industrialization.
Description
Technical field
The invention belongs to laser field, particularly relate to a kind of fiber laser realizing continuous light and pulsed light output.
Background technology
It is high that continuous wave fiber laser has conversion efficiency, good beam quality etc. point and be widely used in the fields such as processing, cutting, mark, welding.In optical-fiber laser field, locked mode is one of method of exporting of the most frequently used at present acquisition pulse, and pulse optical fiber has good beam quality, compact conformation, and narrow output pulse width peak power is high, need not the advantage such as external adding water device for cooling.Be widely used in the fields such as communication, medical treatment, mechanical micro Process.But different for processing request, general machining needs continuous-wave laser, and Precision Machining selects pulse laser better effects if, but general fiber laser only has a kind of mode of operation, and namely single continuous light or pulsed light export.The laser finding simultaneously possessing multiple-working mode is few, document (Mode-lock, Q-switchandCWoperationofanYb-dopeddouble-cladfiberringla ser.OpticsCommunications.Vol.198 (1-3), pp:141-146.2001) in realize locked mode by rotation 1/2nd wave plate, change between Q impulse light and continuous light.This laser is the space structure based on doubly clad optical fiber and wave plate, and adopt optical fiber V type mouth pump coupling, technical difficulty is large, be difficult to realize Industry Promotion, and pulse modulation exists unsteadiness, is unfavorable for the demand of laser continuous operation.
The present invention proposes a kind of method only needing to change feedback device, and the conversion that can realize between stable continuous light and pulsed light exports.This all optical fibre structure continuously and pulse laser has line width, reliability is high, light light conversion efficiency is high, and be easy to maintenance, compact conformation volume is little, the advantage such as can realize commercially producing and have wide application space.
Summary of the invention:
The object of the invention is in order to Problems existing in technical solution background, provide a kind of fiber laser realizing continuous light and pulsed light output, it can provide the output of continuous light or pulsed light according to different application demand.The present invention has compact conformation, good beam quality, and reliability is high, is easy to integrated, non-maintaining, can realize commercially producing.
The invention provides a kind of fiber laser realizing continuous light and pulsed light output, it comprises:
The Transmission Fibers of one band feedback end;
One ring flange, its one end is connected with Transmission Fibers;
One gain fibre, its one end is connected with the other end of ring flange;
One fiber grating, its input is connected with the other end of gain fibre;
One wavelength division multiplexer, its C end is connected with the output of fiber grating, and the R end of this wavelength division multiplexer is output;
Semiconductor laser, its output is held with the P of wavelength division multiplexer and is connected.
The invention has the beneficial effects as follows the extremely strong cavity optical fibre laser selecting compact conformation, one section of feedback is provided at fiber laser, only need manually to change the Transmission Fibers 101 of end face coating or the Transmission Fibers 102 of tail optical fiber encapsulation SESAM (semiconductor saturable absorbing mirror), the conversion between continuous light and pulsed light can be realized, be easy to realize than the mode of the bibliographical information in technical background, expanded the purposes of a laser simultaneously.Laser integrated level of the present invention is high, non-maintaining simultaneously, is easy to realize industrialization.
Accompanying drawing explanation
For further illustrating concrete technology contents of the present invention, be described in detail as follows below in conjunction with embodiment and accompanying drawing, wherein:
Fig. 1 is structural representation of the present invention;
Fig. 2 is that one of Fig. 1 implements illustration;
Fig. 3 is another enforcement illustration of Fig. 1;
Fig. 4 is the mode locking pulse sequence map exported in Fig. 3;
Fig. 5 is that Fig. 1 exports 1064nm laser light spectrogram.
Embodiment
Refer to shown in Fig. 1, Fig. 2 and Fig. 3, a kind of fiber laser realizing continuous light and pulsed light output of the present invention, it comprises:
The Transmission Fibers 10 of one band feedback end, the Transmission Fibers 10 of this band feedback end is the Transmission Fibers 101 (consulting Fig. 2) of end face coating or the Transmission Fibers 102 (consulting Fig. 3) of tail optical fiber encapsulation SESAM (semiconductor saturable absorbing mirror), the reflection kernel wavelength of described end face coating Transmission Fibers institute plated film is 1064nm, reflectivity is greater than 99.3%, it is 1064nm that SESAM in described SESAM Transmission Fibers modulates centre wavelength, reflectivity is 85%, relaxation time 1ps, modulation depth is greater than 10%, saturation flux 32 μ J/cm
2, damage threshold 2.5mJ/cm
2, other one end encapsulation FC joint of band feedback end Transmission Fibers 10, and fiber end face is through 0 ° of angle fine gtinding; One ring flange 20, its one end is connected with Transmission Fibers 10, and ring flange links the loss 0.1dB of two FC joints; One gain fibre 30, its one end is connected with the other end of ring flange 20, and described gain fibre 30 is high Yb dosed optical fiber, is absorbed as 1200dB/m to 976nm pump light, and fiber lengths is 25cm, and core diameter is 6um, and cladding diameter is 125um; One fiber grating 40, its input is connected with the other end of gain fibre 30, export termination wavelength division multiplexer C end, the centre wavelength of described fiber grating 40 is 1064nm, and three dB bandwidth is 0.2nm, and reflectivity is 20%, while touch rejection ratio 11dB; One wavelength division multiplexer 50, its C end is connected with the output of fiber grating 40, and the R end of this wavelength division multiplexer 50 is output, and the operation wavelength of described wavelength division multiplexer 50 is 980/1060nm; Semiconductor laser 60, its output is held with the P of wavelength division multiplexer 50 and is connected, and the centre wavelength of described semiconductor laser 60 is 976nm, and half-wave overall with is 0.5nm, and output peak power is 600mW.
The optical fiber laser structure that continuous light of the present invention exports is see Fig. 2, the optical fiber structure that pulsed light of the present invention exports, see Fig. 3, only needs the Transmission Fibers 10 of belt replacement feedback end, is easy to manual operation between two fiber lasers, need not welding, can repeatedly repeat.
Export for continuous light, see Fig. 2, one end end face is coated with 1064nm high-reflecting film feedback end Transmission Fibers 101 to be linked by ring flange 20 and gain fibre 30, plated film end face and fiber grating 40 form the laserresonator of a 1064nm, are provided feedback by fiber grating 40 and are exported.Being incorporated into by pump light with wavelength division multiplexer 50 mixes in Yb gain fibre 30, and the pump light that its fibre core absorbs 976nm goes out the laser of 1064nm through oscillation radiation.R output again by wavelength division multiplexer 50 after being exported by fiber grating 40 exports the continuous laser of 1064nm.
Export for pulsed light, one end end face used for continuous light (Fig. 1) is coated with 1064nm high-reflecting film feedback end Transmission Fibers 101, after the one end encapsulated by its FC is backed out from ring flange 20, change the reflection kernel wavelength of the Transmission Fibers 102, SESAM of tail optical fiber encapsulation SESAM at 1064nm place.The fiber grating 40 of itself and 1064nm forms the laserresonator of a 1064nm.Adopt wavelength division multiplexer 50 pump light to be incorporated into vibration in resonant cavity and form the laser of 1064nm.Simultaneously due to the non-linear modulation effect of semiconductor saturable absorber, form pulsed light, when these light pulses are by semiconductor saturable absorber, the loss of marginal portion is greater than middle body, such light pulse pulsewidth in the process passing through semiconductor saturable absorber is narrowed, along with the increase gradually of pump light, the passive mode locking that meeting self-starting is stable.Export the pulsed light of picosecond magnitude.Finally pulse laser is exported by the R output of fiber grating 40 and wavelength division multiplexer 50.
Those of ordinary skill in the art will be appreciated that, above execution mode is only used to the present invention is described, and not as limitation of the invention, as long as within the scope of the invention, all will drop on protection scope of the present invention to the change of above example, modification.Change fiber grating 40 and the SESAM device of its commplementary wave length, all will drop within protection scope of the present invention.Such as change one end end face and be coated with 1550nm high-reflecting film feedback end Transmission Fibers 101, the Transmission Fibers 102 of tail optical fiber encapsulation SESAM, wherein the reflection wavelength of SESAM is 1550nm, and the fiber grating 40 of centre wavelength 1550nm, can realize the continuous light of 1550nm and the output of pulsed light; Change one end end face and be coated with 2000nm high-reflecting film feedback end Transmission Fibers 101, the Transmission Fibers 102 of tail optical fiber encapsulation SESAM, wherein the reflection wavelength of SESAM is 2000nm, the fiber grating 40 of centre wavelength 2000nm, operation wavelength is the wavelength division multiplexer 50 of 790/200nm and the semiconductor laser 60 of output wavelength 790nm, can realize the continuous light of 2000nm and the output of pulsed light.These are all modification of the present invention, all will drop within protection scope of the present invention.
Output of the present invention can also connect amplifying stage and realize high power laser light output, tens can be realized according to the different designs of amplifying stage to export to the average power of a few hectowatt, the purposes of this laser can be expanded wider, be applicable to Precision Machining, the making of solar panel, precision drilling and cutting, and micro-cladding etc.
Instantiation one
Laser of the present invention has two kinds of output modes, continuous light and pulsed lights.
Adopt the fiber laser that the continuous light of structure as shown in Figure 2 exports.Transmission Fibers 101 one end end face plating 1064nm high-reflecting film of end face coating, its reflectivity is 99.3%, does not have the end face encapsulation FC joint of plated film, its FC joint mounting flange 20 one end.Gain fibre 30 adopts the height of 25cm to mix Yb monomode fiber, fibre core is absorbed as 1200dB/m to 976nm pump light, 6/125 μm, fine footpath, and fibre core numerical aperture NA. is 0.14, one end end surface grinding encapsulates FC joint after becoming 0 ° of angle, other one end of FC joint mounting flange 20.Fiber grating 40 adopts centre wavelength to be 1064nm, and reflectivity is 20%, and three dB bandwidth is the Bragg grating of 0.2nm, its input termination gain fibre 30.The output of the C terminated optical fiber grating 40 of wavelength division multiplexer 50.Semiconductor laser 60 adopt peak power be 600mW as pumping source, it exports R end of termination wavelength division multiplexer.The laser resonance cavity length of integral optical fiber laser is 2m.In this configuration, when pumping source is added to 300mW, export the laser of the 1064nm of 75.8mW at the R end of wavelength division multiplexer 50, spectral width is 0.2nm, and its spectrum is see Fig. 5.It is one of way of output of this laser.
The Transmission Fibers 101 of manual replacing end face coating, after it being backed out above ring flange 20, manually connect the Transmission Fibers 102 of tail optical fiber encapsulation SESAM, its structure chart is see Fig. 3.All the other devices and parameter are all constant compared with Fig. 2.Wherein SESAM is the saturable absorber of the 1064nm wavelength of BATOP company.Be 80% to 1064nm light reflectance, modulation depth is 10%, and saturation flux is 32 μ J/cm
2, chamber length is still 2m.Realize continuous locking mold to export when the pump light of semiconductor laser 60 is added to 220mW, corresponding power output is 30.8mW, and as shown in Figure 4, spectrogram as shown in Figure 5 for the mode locking pulse sequence map of its correspondence, centre wavelength is 1064.1nm, and half-wave overall with is 0.2nm.Corresponding pulsewidth is 35ps, and repetition rate is 49MHz.Continue to increase pump light, when pump light is added to 280mW, continuous locking mold collection of illustrative plates starts there is disturbance, the 46.4mW of now corresponding output.Namely continuous locking mold interval is the power stage of 30.8-46.4mW.
The above; be only the embodiment in the present invention, but protection scope of the present invention is not limited thereto, any people being familiar with this technology is in the technical scope disclosed by the present invention; the conversion that can expect easily or replacement, all should be encompassed in of the present invention comprising within scope.Therefore, protection scope of the present invention should be as the criterion with the protection range of claims.
Claims (8)
1. realize a fiber laser for continuous light and pulsed light output, it comprises:
The Transmission Fibers of one band feedback end;
One ring flange, its one end is connected with Transmission Fibers;
One gain fibre, its one end is connected with the other end of ring flange;
One fiber grating, its input is connected with the other end of gain fibre;
One wavelength division multiplexer, its C end is connected with the output of fiber grating, and the R end of this wavelength division multiplexer is output;
Semiconductor laser, its output is held with the P of wavelength division multiplexer and is connected.
2. the fiber laser realizing continuous light and pulsed light output according to claim 1, wherein feedback end Transmission Fibers is the Transmission Fibers of end face coating or the Transmission Fibers 102 of tail optical fiber encapsulation SESAM.
3. the fiber laser realizing continuous light and pulsed light output according to claim 2, wherein the reflection kernel wavelength of end face coating Transmission Fibers institute plated film is 1064nm, and reflectivity is greater than 99.3%.
4. the fiber laser realizing continuous light and pulsed light output according to claim 2, it is 1064nm that SESAM in wherein said SESAM Transmission Fibers modulates centre wavelength, and reflectivity is greater than 80%, relaxation time 1ps, modulation depth is greater than 10%, saturation flux 32 μ J/cm
2, damage threshold is greater than 2mJ/cm
2.
5. the fiber laser realizing continuous light and pulsed light and export according to claim 1, wherein said gain fibre 30 is high Yb dosed optical fiber, is absorbed as 1200dB/m to 976nm pump light, and fiber lengths is 25cm.
6. the fiber laser realizing continuous light and pulsed light output according to claim 1, the centre wavelength of wherein said fiber grating 40 is 1064nm, and three dB bandwidth is 0.2nm, and reflectivity is 20%, while touch rejection ratio to be greater than 10dB.
7. the fiber laser realizing continuous light and pulsed light output according to claim 1, the operation wavelength of wherein said wavelength division multiplexer 50 is 980/1060nm.
8. the fiber laser realizing continuous light and pulsed light output according to claim 1, the centre wavelength of wherein said semiconductor laser 60 is 976nm, and half-wave overall with is 0.5nm, and power output is 600mW.
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| CN201374492Y (en) * | 2009-03-13 | 2009-12-30 | 深圳市明鑫科技发展有限公司 | High-power single-frequency pulse/continuous dual-output fiber laser |
| CN102842843A (en) * | 2011-06-21 | 2012-12-26 | 中国人民解放军国防科学技术大学 | Method for realizing all-fiber package of semiconductor saturable absorption mirror |
| CN103066483A (en) * | 2013-01-08 | 2013-04-24 | 中国科学院半导体研究所 | Laser used for producing multi-wavelength multiple-pulse fiber laser signals |
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| TWI346429B (en) * | 2007-04-27 | 2011-08-01 | Univ Nat Taiwan Science Tech | Broadband fiber laser |
| US8767286B2 (en) * | 2010-04-12 | 2014-07-01 | Lockheed Martin Corporation | Signal and pump mode-field adaptor for double-clad fibers and associated method |
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| CN201374492Y (en) * | 2009-03-13 | 2009-12-30 | 深圳市明鑫科技发展有限公司 | High-power single-frequency pulse/continuous dual-output fiber laser |
| CN102842843A (en) * | 2011-06-21 | 2012-12-26 | 中国人民解放军国防科学技术大学 | Method for realizing all-fiber package of semiconductor saturable absorption mirror |
| CN103066483A (en) * | 2013-01-08 | 2013-04-24 | 中国科学院半导体研究所 | Laser used for producing multi-wavelength multiple-pulse fiber laser signals |
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