CN103280690A - Fiber laser outputting continuous light and pulse light - Google Patents
Fiber laser outputting continuous light and pulse light Download PDFInfo
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- CN103280690A CN103280690A CN2013102057118A CN201310205711A CN103280690A CN 103280690 A CN103280690 A CN 103280690A CN 2013102057118 A CN2013102057118 A CN 2013102057118A CN 201310205711 A CN201310205711 A CN 201310205711A CN 103280690 A CN103280690 A CN 103280690A
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Abstract
A fiber laser outputting continuous light and pulse light comprises a transmission optical fiber provided with a feedback end, a flange plate, a gain optical fiber, a fiber grating, a wavelength division multiplexer and a semiconductor laser unit, wherein one end of the flange plate is connected with the transmission optical fiber, one end of the gain optical fiber is connected with the other end of the flange plate, the input end of the fiber grating is connected with the other end of the gain optical fiber, the C end of the wavelength division multiplexer is connected with the output end of the fiber grating, the R end of the wavelength division multiplexer is the output end, and the output end of the semiconductor laser unit is connected with the P end of the wavelength division multiplexer. The fiber laser outputting the continuous light and the pulse light is high in integration level and free of maintenance, and industrialization can be easily achieved.
Description
Technical field
The invention belongs to laser field, relate in particular to a kind of fiber laser of realizing continuous light and pulsed light output.
Background technology
Points such as the continuous wave fiber laser has the conversion efficiency height, good beam quality and be widely used in fields such as processing, cutting, mark, welding.In the optical-fiber laser field, locked mode is one of method of at present the most frequently used acquisition pulse output, and pulse optical fiber has good beam quality, compact conformation, and narrow output pulse width peak power height need not add advantages such as water cooling plant.Be widely used in communication, medical treatment, mechanical little processing and other fields.But at the processing request difference, general machining needs continuous-wave laser to get final product, and Precision Machining is selected the pulse laser better effects if for use, but general fiber laser has only a kind of mode of operation, and namely single continuous light or pulsed light are exported.The laser finding that possesses multiple mode of operation simultaneously is few, document (Mode-lock, Q-switch and CW operation of an Yb-doped double-clad fiber ring laser.Optics Communications.Vol.198 (1-3) realizes changing between locked mode, Q impulse light and the continuous light by rotation 1/2nd wave plates in pp:141-146.2001).This laser is based on the space structure of doubly clad optical fiber and wave plate, adopts optical fiber V type mouth pumping coupling, and technical difficulty is big, be difficult to realize Industry Promotion, and there is unsteadiness in pulse modulation, is unfavorable for the demand of laser continuous operation.
The present invention proposes a kind of method that only need change feedback device, can realize the conversion output between stable continuous light and the pulsed light.This all optical fibre structure continuously and pulse laser have line width, reliability height, light light conversion efficiency height is easy to maintenance, the compact conformation volume is little, advantage such as can realize commercially producing and has wide application space.
Summary of the invention:
The objective of the invention is the problem that exists in the technical solution background, a kind of fiber laser of realizing continuous light and pulsed light output is provided, it can provide the output of continuous light or pulsed light according to the different application demand.The present invention has compact conformation, good beam quality, and the reliability height is easy to integratedly, non-maintaining, can realize commercially producing.
The invention provides a kind of fiber laser of realizing continuous light and pulsed light output, it comprises:
The Transmission Fibers of one band feedback end;
One ring flange, the one end is connected with Transmission Fibers;
One gain fibre, the 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;
The semiconductor laser, its output is connected with the P end of wavelength division multiplexer.
The invention has the beneficial effects as follows the extremely strong cavity optical fibre laser of selecting compact conformation for use, one section of feedback is provided at fiber laser, only need manually change the Transmission Fibers 101 of end face coating or the Transmission Fibers 102 of tail optical fiber encapsulation SESAM (semiconductor saturable absorbing mirror), can realize the conversion between continuous light and the pulsed light, mode than the bibliographical information in the technical background is easy to realize, has expanded the purposes of a laser simultaneously.Laser integrated level height of the present invention is non-maintaining simultaneously, is easy to realize industrialization.
Description of drawings
For further specifying concrete technology contents of the present invention, below in conjunction with embodiment and accompanying drawing describes in detail as after, 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;
The mode locking pulse sequence map of Fig. 4 for exporting among Fig. 3;
Fig. 5 exports 1064nm laser light spectrogram for Fig. 1.
Embodiment
See also Fig. 1, Fig. 2 and shown in Figure 3, a kind of fiber laser of 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 102 (consulting Fig. 3) of the Transmission Fibers 101 (consulting Fig. 2) of end face coating or 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%, SESAM modulation centre wavelength in the described SESAM Transmission Fibers is 1064nm, 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, the other 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, the one end is connected with Transmission Fibers 10, and ring flange links the loss 0.1dB of two FC joints; One gain fibre 30, the one end is connected with the other end of ring flange 20, and described gain fibre 30 is high Yb dosed optical fiber, and to the 1200dB/m that is absorbed as of 976nm pump light, fiber lengths is 25cm, and core diameter is 6um, cladding diameter is 125um; One fiber grating 40, its input is connected with the other end of gain fibre 30, output termination wavelength division multiplexer the C end, the centre wavelength of described fiber grating 40 is 1064nm, three dB bandwidth is 0.2nm, reflectivity is 20%, rejection ratio 11dB is touched on the limit; 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 connected with the P end of wavelength division multiplexer 50, and the centre wavelength of described semiconductor laser 60 is 976nm, and the half-wave overall with is 0.5nm, and the output peak power is 600mW.
The optical fiber laser structure of continuous light output of the present invention is referring to Fig. 2, the optical fiber structure of pulsed light of the present invention output is referring to Fig. 3, only needs between two fiber lasers more that the Transmission Fibers 10 of tape swapping feedback end gets final product, and is easy to manual operation, need not welding, can repeatedly repeat.
Export at continuous light, referring to Fig. 2, one end end face is coated with 1064nm high-reflecting film feedback end Transmission Fibers 101 links with gain fibre 30 by ring flange 20, plated film end face and fiber grating 40 form the laserresonator of a 1064nm, provide feedback and output by fiber grating 40.With wavelength division multiplexer 50 pump light is incorporated into and mixes in the Yb gain fibre 30, the pump light that its fibre core absorbs 976nm gives off the laser of 1064nm through vibration.By export the continuous laser of 1064nm after fiber grating 40 outputs again by the R output of wavelength division multiplexer 50.
Export at pulsed light, the end end face that continuous light (Fig. 1) is used is coated with 1064nm high-reflecting film feedback end Transmission Fibers 101, after one end of its FC encapsulation backed out from ring flange 20, change the Transmission Fibers 102 of tail optical fiber encapsulation SESAM, the reflection kernel wavelength of SESAM is at the 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 the laser of vibration formation 1064nm in the resonant cavity.Simultaneously because the non-linear modulation effect of semiconductor saturable absorber, form pulsed light, when semiconductor saturable absorber is passed through in these light pulses, the loss of marginal portion is greater than middle body, light pulse is narrowed by pulsewidth in the process of semiconductor saturable absorber like this, along with the increase gradually of pump light, can the stable passive mode locking of self-starting.The pulsed light of output picosecond magnitude.R output by fiber grating 40 and wavelength division multiplexer 50 is finally exported pulse laser.
Those of ordinary skill in the art will be appreciated that above execution mode only is that the present invention is described, and is 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 variation, the modification of above example.Change fiber grating 40 and the SESAM device of its commplementary wave length, all will drop within protection scope of the present invention.For example change an 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 the fiber grating 40 of 1550nm and centre wavelength 1550nm, can realize the output of continuous light and the pulsed light of 1550nm; Change an 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 output of continuous light and the pulsed light of 2000nm.These all are 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, different designs according to amplifying stage can realize the tens average power outputs to several hectowatts, make the purposes of this laser can expand wideer, be applicable to Precision Machining, the making of solar panel, precision drilling and cutting, and little cladding etc.
Instantiation one
Laser of the present invention has two kinds of output modes, continuous light and pulsed lights.
Adopt the fiber laser of the continuous light output of structure as shown in Figure 2.The Transmission Fibers 101 1 end end faces 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 1 ends.Gain fibre 30 adopts the height of 25cm to mix the Yb monomode fiber, fibre core is to the 1200dB/m that is absorbed as of 976nm pump light, and fibre is 6/125 μ m directly, and fibre core numerical aperture NA. is 0.14, one end end surface grinding becomes encapsulation FC joint behind 0 ° of angle, an other end of FC joint mounting flange 20.It is 1064nm that fiber grating 40 adopts centre wavelength, 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 powers be 600mW as pumping source, R end of its output termination wavelength division multiplexer.The laser resonance cavity length of whole fiber laser is 2m.In this structure, when pumping source was added to 300mW, at the laser of the 1064nm of the R of wavelength division multiplexer 50 end output 75.8mW, spectral width was 0.2nm, and its spectrum is referring to Fig. 5.It is one of way of output of this laser.
Manually change the Transmission Fibers 101 of end face coating, after it is backed out, manually connect the Transmission Fibers 102 of tail optical fiber encapsulation SESAM above ring flange 20, its structure chart is referring to Fig. 3.All the other devices and parameter are compared all constant with Fig. 2.Wherein SESAM is the saturable absorber of the 1064nm wavelength of BATOP company.Be 80% to 1064nm reflection of light rate, modulation depth is 10%, and saturation flux is 32 μ J/cm
2, chamber length still is 2m.When being added to 220mW, realizes the pump light of semiconductor laser 60 continuous locking mold output, corresponding power output is 30.8mW, and its corresponding mode locking pulse sequence map is seen shown in Figure 4, and spectrogram as shown in Figure 5, centre wavelength is 1064.1nm, and the half-wave overall with is 0.2nm.Corresponding pulsewidth is 35ps, and repetition rate is 49MHz.Continuing increases pump light, and the continuous locking mold collection of illustrative plates begins that disturbance is arranged when pump light is added to 280mW, the 46.4mW of the output that this moment is corresponding.Be the interval power output for 30.8-46.4mW of continuous locking mold.
The above; only be the embodiment among the present invention, but protection scope of the present invention is not limited thereto, anyly is familiar with the people of this technology in the disclosed technical scope of the present invention; the conversion that can expect easily or replacement all should be encompassed in of the present invention comprising within the scope.Therefore, protection scope of the present invention should be as the criterion with the protection range of claims.
Claims (8)
1. fiber laser of realizing the output of continuous light and pulsed light, it comprises:
The Transmission Fibers of one band feedback end;
One ring flange, the one end is connected with Transmission Fibers;
One gain fibre, the 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;
The semiconductor laser, its output is connected with the P end of wavelength division multiplexer.
2. the fiber laser of realization continuous light according to claim 1 and pulsed light output, wherein the feedback end Transmission Fibers is the Transmission Fibers 102 of the Transmission Fibers of end face coating or tail optical fiber encapsulation SESAM.
Realization continuous light according to claim 2 and pulsed light output fiber laser, wherein the reflection kernel wavelength of end face coating Transmission Fibers institute plated film is 1064nm, reflectivity is greater than 99.3%.
Realization continuous light according to claim 2 and pulsed light output fiber laser, SESAM in wherein said SESAM Transmission Fibers modulation centre wavelength is 1064nm, 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
Realization continuous light according to claim 1 and pulsed light output fiber laser, wherein said gain fibre 30 is high Yb dosed optical fiber, to the 1200dB/m that is absorbed as of 976nm pump light, fiber lengths is 25cm.
Realization continuous light according to claim 1 and pulsed light output fiber laser, the centre wavelength of wherein said fiber grating 40 is 1064nm, three dB bandwidth is 0.2nm, reflectivity is 20%, rejection ratio is touched greater than 10dB in the limit.
Realization continuous light according to claim 1 and pulsed light output fiber laser, the operation wavelength of wherein said wavelength division multiplexer 50 is 980/1060nm.
Realization continuous light according to claim 1 and pulsed light output fiber laser, the centre wavelength of wherein said semiconductor laser 60 is 976nm, the half-wave overall with is 0.5nm, power output is 600mW.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113809621A (en) * | 2020-06-12 | 2021-12-17 | 大族激光科技产业集团股份有限公司 | High-power continuous optical fiber laser and processing method of central optical fiber thereof |
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| US20110249320A1 (en) * | 2010-04-12 | 2011-10-13 | Lockheed Martin Corporation | High beam quality and high average power from large-core-size optical-fiber amplifiers |
| 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 |
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| US20100008386A1 (en) * | 2007-04-27 | 2010-01-14 | Shien-Kuei Liaw | Broadband fiber laser |
| 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 |
| US20110249320A1 (en) * | 2010-04-12 | 2011-10-13 | Lockheed Martin Corporation | High beam quality and high average power from large-core-size optical-fiber amplifiers |
| 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 |
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| CN113809621A (en) * | 2020-06-12 | 2021-12-17 | 大族激光科技产业集团股份有限公司 | High-power continuous optical fiber laser and processing method of central optical fiber thereof |
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