CN101588008B - Dual-wavelength high-power self-similarity femtosecond pulse Yb-doping microstructure optical fiber laser - Google Patents
Dual-wavelength high-power self-similarity femtosecond pulse Yb-doping microstructure optical fiber laser Download PDFInfo
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Abstract
The present invention belongs to a non-linear optical fiber optical field, and discloses a dual-wavelength high-power self-similarity femtosecond pulse Yb-doping microstructure optical fiber laser, principally including a pumping laser light source, a WDM coupler, a positive dispersion single mode fiber, a Yb-doping microstructure optical fiber, a polarizer, a polarization controller, a circulator, a polarization-preserving fiber grating, an output coupler and a dispersive delay line. An input pulse generates a self-similarity pulse with a better stability in the positive dispersion single mode fiber and the Yb-doping microstructure optical fiber, a wavelength of an output laser is selected in the polarization-preserving fiber grating with two reflection peaks by adjusting the polarizationcontroller, so as to implement a stable operation of double wavelengths at a normal temperature and output a laser with a good polarization degree. The laser of the invention has a large output energ y, a good wavelength stability, and it is easy to obtain a high power ultrashort pulse; the structure is simple, regulation is convenient, and has a wide application for a research, a production and an engineering of fields such as a laser processing, a light communication, a light transmission, an optical fiber sensing and the like.
Description
Technical field
The invention belongs to the nonlinear optical fiber optical field, specifically is a kind of dual-wavelength high-power self-similarity femtosecond pulse Yb-doping microstructure fiber laser.
Background technology
Superpower laser is used widely in the industrial development of countries in the world, especially industrially developed country, the high power laser light process technology is described as " following manufacturing common manufacturing process " by people, be improve production efficiency and product quality, reduce cost, increase benefit, improve the important means of international competitiveness, representing the developing direction of present material processing industry.And the multi wave length illuminating source of function admirable also has great using value in fields such as optical communication, laser ranging, spectrum analysis and profile fiber sensing.
Similarity pulse has solved the intensity restricted problem of pulse in the transmission well, and when it was propagated at high power, pulse shape did not change, and has the ability of resisting the light wave division, has strict linear chrip characteristic, is easy to obtain high-power ultrashort compression pulse.
Research for the similarity pulse fiber laser at present mainly is based on common gain fibre.Be subjected to the inspiration of dispersion management orphan design principle, 2004-2005, F.O.Ilday, wait the people to use 4 kinds of optical devices to constitute a similarity pulse laser: one section monomode fiber (SMF) with positive GVD, as the main body of similarity pulse evolution; Short as far as possible a bit of gain fibre (GAIN), as the gain media of laser, its GVD and non-linear can ignoring; One section saturated absorbing body (SA), for laser provides locked mode, and as output coupler; One has negative GVD but non-linear negligible dispersive delay line (DDL), so that the similarity pulse that forms is effectively compressed (F.O.Ilday, J.R.Buckley, W.G.Clarkand F.W.Wise, Self-similar Evolution of Parabolic Pulse in a Laser, Phys.Rev.Lett.2004,92 (21): 213902 (1-4); C.K.Nielsen, B.Ortac, T.Schreiber, and J.Limpert, Self-starting Self-similar All-polarization Maintaining Yb-doped Fiber Laser, Opt.Lett.2005,13 (23): 9346-9351), and carried out relative theory analysis and experimental study, but the design principle and the pulse that produced of experimental technique that are based on them are not proper similarity pulse, but the dispersion management soliton pulse.People such as recent Feng Jie have designed the fiber laser that produces similarity pulse on the stricti jurise, (Feng Jie; Xu Wencheng; Chen Weicheng; Liu Songhao, self-similar pulsed fiber laser in femtosecond: CN100429846C; Feng Jie; Xu Wencheng; Chen Weicheng; Liu Songhao, self-similar pulsed erbium doped fiber laser in femtosecond: CN100429847C).But in their the research to the similarity pulse fiber laser, all do not consider the influence of higher-order effect to similarity pulse, and in fact higher-order effect can cause unsteadiness (the Liu Wei-Ci of pulse in the distortion of similarity pulse and the aggravation laser, Xu Wen-Cheng, Feng Ji, Chen Wei-Cheng, Li Shu-Xian, Liu Song-Hao, Higher-order Effects on Self-Similar parabolic Pulse inMicrostructured Fiber Amplifier, Chinese Physics, 2008,17 (3) 1025-1028; Weici Liu, Wencheng Xu, Jie Feng, Weicheng Chen, Shuxian Li, Songhao Liu, Higher-order Effectson Self-Similar parabolic Pulse Evolution in Microstructured Fiber Amplifier, Proc.SPIE Vol.2007,6783,678301; Yury Logvin and Hanan Anis, Similariton pulseinstability in mode-locked Yb-doped fiber laser in the vicinity of zero cavityDispersion.OPTICS EXPRESS 2007,15 (21): 13607-13612.).
People such as C.Finot utilized numerical simulation and the experimental study (C.Finot that has carried out producing similarity pulse series with full optical device in 2005, S.Pitois, and G.Millot, Regenerative 40Gbit/s wavelength converterbased on similariton generation, Optics Letters, 2005,30, (14): 1776-1778), produce similarity pulse series, and structure is too complicated but mainly be based on amplifier.
Existing similarity pulse fiber laser all consider to suppress higher-order effect in design, less stable in the practical application, and to the research of multi-wavelength similarity pulse laser do not appear in the newspapers as yet to.
Summary of the invention
The object of the present invention is to provide a kind of dual-wavelength high-power self-similarity femtosecond pulse Yb-doping microstructure fiber laser, it suppresses higher-order effect based on Yb-doping microstructure CHROMATIC DISPERSION IN FIBER OPTICS and non-linear controllability, improve the stability of self-similar pulsed fiber laser in femtosecond, utilize two reflection peak output dual wavelength similarity pulse of polarization-maintaining fiber grating.
Technical scheme of the present invention is as follows:
A kind of dual-wavelength high-power self-similarity femtosecond pulse Yb-doping microstructure fiber laser, it is characterized in that by the pumping laser light source, wave division multiplex coupler, the positive dispersion monomode fiber, Yb-doping microstructure optical fiber, the polarizer, circulator, Polarization Controller, polarization-maintaining fiber grating and output coupler connect into optic fiber ring-shaped cavity with optical fiber, wave division multiplex coupler comprises first port, second port and the 3rd port, circulator comprises first port, second port and the 3rd port, output coupler comprises first port, second port and the 3rd port, the pumping laser light source is connected with first port of wave division multiplex coupler, the 3rd port of wave division multiplex coupler is through the positive dispersion monomode fiber, Yb-doping microstructure optical fiber, the polarizer is connected to first port of circulator, second port of circulator is connected to polarization-maintaining fiber grating through Polarization Controller, the 3rd port of circulator is connected with first port of output coupler, and second port of output coupler is connected to second port of wave division multiplex coupler; The 3rd port of output coupler is connected with dispersive delay line.
Further, the airport radius of Yb-doping microstructure optical fiber is 0.20～0.29 μ m, and the airport spacing is 1.82～2.3 μ m, doping content 10
24～10
25m
-3, length is 1～7m.
Further, the second order GVD (Group Velocity Dispersion) value of positive dispersion monomode fiber is more than or equal to 6.0 * 10
-1Ps
2m
-1, length is 6～12m.
Further, polarization-maintaining fiber grating is based on the polarization-maintaining fiber grating of ordinary optic fibre or photonic crystal fiber, and its centre wavelength is positioned at 1030nm and 1064nm.
Further, pumping laser light source output Wavelength of Laser is 980nm.
Further, the wave-length coverage of wave division multiplex coupler is 976～1550nm.
Further, output coupler is high-power coupler, and coupling efficiency is 40～60%.
Further, the second order GVD (Group Velocity Dispersion) value of dispersive delay line is less than-1.0 * 10
-1Ps
2m
-1
The core diameter of Yb-doping microstructure optical fiber, covering airport diameter, its great flexibility in structural design aspect has been given in the isoparametric various combinations of spacing between the covering airport, thereby it is controlled to make it have the chromatic dispersion characteristic, no wavelength restriction single mode transport, band gap limits hollow leaded light, many new kink characteristics such as nonlinear effect is controlled. and its chromatic dispersion and non-linear adjustable controlled, the generation and transmission (the Liu Wei-Ci that help the high-quality similarity pulse, Xu Wen-Cheng, Feng Ji, ChenWei-Cheng, Li Shu-Xian, Liu Song-Hao, Higher-order Effects on Self-Similar parabolicPulse in Microstructured Fiber Amplifier, Chinese Physics, 2008,17 (3) 1025-1028; Weici Liu, Wencheng Xu, Jie Feng, Weicheng Chen, Shuxian Li, Songhao Liu, Higher-order Effects on Self-Similar parabolic Pulse Evolution in MicrostructuredFiber Amplifier, Proc.SPIE Vol.2007,6783,678301.); And the ytterbium ion in the Yb-doping microstructure optical fiber has very wide absorption spectra (800nm～1060nm) and emission spectra (975nm～1200nm), and its emission spectra can produce the ultrashort similarity pulse of high power just in time in the positive dispersion zone of silica fiber.
The birefringence that polarization-maintaining fiber grating is introduced helps to separate the polarization state of different wave length in the Yb-doping microstructure optical fiber, thereby has strengthened polarisation hole-burning effect in the Yb-doping microstructure optical fiber of even broadening.This polarisation hole-burning effect has strengthened the non-homogeneous gain broadening of Yb-doping microstructure optical fiber greatly, thereby has reduced the competition between the different mode.Therefore, we can at room temperature obtain stable double wave-length vibration.On the other hand, by adjusting the state of Polarization Controller, promptly change the birefringence state in the chamber, the reflection characteristic of fiber grating can change, when the gain population of two pattern correspondences much at one the time, two pattern stable oscillation stationary vibrations simultaneously, and, can make the amplitude of two wavelength correspondences almost equal by the careful state of regulating Polarization Controller.Based on above principle, just formed selection to laser oscillation mode, promptly make laser works at stable dual wavelength state by the state of adjusting Polarization Controller.
Dual-wavelength high-power self-similarity femtosecond pulse Yb-doping microstructure fiber laser of the present invention, input pulse produce high-quality similarity pulse in positive dispersion monomode fiber and Yb-doping microstructure optical fiber; Fiber grating can play energy back and frequency-selecting effect, by regulating Polarization Controller, exports Wavelength of Laser at the fiber grating with two reflection peaks and selects, and realizes dual wavelength stable operation at normal temperatures, the laser that the output polarization degree is good.Circulator also plays isolator, guarantees light clockwise direction operation in the chamber.The similarity pulse laser can produce high-octane pulse, so can utilize the output coupler of higher output coupling ratio, make the output pulse energy account for big percentage, and utilize dispersive delay line to compress to obtain the high power ultrashort pulse, like this we can to obtain power higher, the similarity pulse that pulsewidth is shorter.
Compare with existing similarity pulse fiber laser, this laser has the following advantages:
1: used Yb-doping microstructure optical fiber is with respect to common Yb dosed optical fiber, and chromatic dispersion and non-linear adjustable controlled helps suppressing the unsteadiness that higher-order effect causes, guarantees the generation and the transmission of the light pulse of high-quality self similarity.
2: used polarization-maintaining fiber grating helps stable output under the dual wavelength self similarity light pulse normal temperature, and wavelength stability is good, easily obtains double-wavelength short pulse.
3: than common multi-wavelength optical fiber laser, the light pulse that the exportable power of this laser is higher, pulsewidth is shorter.
4: simple in structure, easy to adjust, scientific research, production and engineering in fields such as laser processing, optical communication, optical transmission, Fibre Optical Sensor have a wide range of applications.
Description of drawings
Fig. 1 is the schematic diagram of dual-wavelength high-power self-similarity femtosecond pulse Yb-doping microstructure fiber laser of the present invention.
Fig. 2 is the output waveform figure of embodiment 1.
Fig. 3 is the output waveform figure of embodiment 2.
Fig. 4 is the output waveform figure of embodiment 3.
Embodiment
Below in conjunction with drawings and Examples the present invention is done explanation in further detail.
As shown in Figure 1, by pumping laser light source 1, wave division multiplex coupler 2, positive dispersion monomode fiber 3, Yb-doping microstructure optical fiber 4, the polarizer 5, circulator 6, Polarization Controller 7, polarization-maintaining fiber grating 8 and output coupler 9 usefulness optical fiber connect into optic fiber ring-shaped cavity, wave division multiplex coupler 2 comprises first port 21, second port 22 and the 3rd port 23, circulator 6 comprises first port 61, second port 62 and the 3rd port 63, output coupler 9 comprises first port 91, second port 92 and the 3rd port 93, pumping laser light source 1 is connected with first port 21 of wave division multiplex coupler 2, the 3rd port 23 of wave division multiplex coupler 2 is through positive dispersion monomode fiber 3, Yb-doping microstructure optical fiber 4, the polarizer 5 is connected to first port 61 of circulator 6, second port 62 of circulator 6 is connected to polarization-maintaining fiber grating 8 through Polarization Controller 7, the 3rd port 63 of circulator 6 is connected with first port 91 of output coupler 9, and second port 92 of output coupler 9 is connected to second port 22 of wave division multiplex coupler 2; The 3rd port 93 of output coupler 9 is connected with dispersive delay line 10.
In positive dispersion monomode fiber 3 and Yb-doping microstructure optical fiber 4, produce similarity pulse.Circulator 6 also plays isolator, guarantees light clockwise direction operation as shown in Figure 1 in the chamber.Polarization-maintaining fiber grating 8 can play energy back and frequency-selecting effect, and the polarization-maintaining fiber grating 8 that has two reflection peaks is herein exported the Wavelength of Laser selection.The coupling efficiency of output coupler 9 is 40%～60%.Rotatory polarization controller 7 can make dual-wavelength laser export simultaneously.Self-similar pulsed fiber laser in femtosecond can produce high-octane pulse, so can utilize the output coupler 9 of higher output coupling ratio, make the output pulse energy account for big percentage, and utilize dispersive delay line 10 to compress to obtain ultrashort pulse, it is higher so just can to obtain power, the high power ultrashort pulse that pulse is shorter.
The parameter of table 1 Yb-doping microstructure optical fiber
| Yb-doping microstructure optical fiber | Airport radius (μ m) | Airport spacing (μ m) | 2nd order chromatic dispersion (ps 2m -1) | Third-order dispersion (ps 3m -1) | Non-linear (W -1m -1) | Doping content (m -3) | Length (m) |
| F | 0.20～ 0.29 | 1.82～ 2.3 | 0.046～ 0.08 | 0.0002～ 0.001 | 0.003～ 0.001 | 10 24～ 10 25 | 1～7 |
Table 1 is parameters such as the structural parameters, chromatic dispersion of Yb-doping microstructure optical fiber 4, non-linear, doping content.
Other parameters of operating part range specification of dual-wavelength high-power self-similarity femtosecond pulse Yb-doping microstructure fiber laser of the present invention is as follows:
(1) positive dispersion monomode fiber 3 length are 6～12m, and the positive second order GVD (Group Velocity Dispersion) value (positive GVD) that is provided is not less than 6.0 * 10
-1Ps
2m
-1, its non linear coefficient is less than 1 * 10
-3W
-1m
-1
(2) pumping laser light source 1 adopts the pumping laser light source of 980nm;
(3) wave-length coverage of wave division multiplex coupler 2 is 976～1550nm;
(4) output coupler 9 is high-power coupler, and coupling efficiency is 40～60%;
(5) centre wavelength of polarization-maintaining fiber grating 8 is positioned at 1064nm and 1030nm;
(6) the negative second order GVD (Group Velocity Dispersion) value (negative GVD) of dispersive delay line 10 is less than-1.0 * 10
-1Ps
2m
-1
Make that the input pulse energy is 30PJ, pulse is 1.1ps, the long 7m of monomode fiber, and the 2nd order chromatic dispersion of dispersive delay line is-1.2 * 10
-1Ps
2m
-1, below three kinds of embodiments:
Embodiment 1
The 2nd order chromatic dispersion of Yb-doping microstructure optical fiber 4 is 0.046ps
2m
-1, third-order dispersion is 0.001ps
3m
-1, non-linear value is 0.003W
-1m
-1, gain coefficient g=1.2m
-1, long 1m, as shown in Figure 2, the nearly 8KW of the power output of femtosecond pulse, the about 200fs of pulsewidth, the double wave long value is respectively 1040nm and 1060nm.
Embodiment 2
The 2nd order chromatic dispersion of Yb-doping microstructure optical fiber 4 is 0.06ps
2m
-1, third-order dispersion is 0.0005ps
3m
-1, non-linear value is 0.002W
-1m
-1, gain coefficient g=0.7m
-1, long 3.5m, as shown in Figure 3, the nearly 8KW of the power output of femtosecond pulse, the about 200fs of pulsewidth, the double wave long value is respectively 1038nm and 1062nm.
The 2nd order chromatic dispersion of Yb-doping microstructure optical fiber 4 is 0.08ps
2m
-1, third-order dispersion is 0.0002ps
3m
-1, non-linear value is 0.001W
-1m
-1, gain coefficient g=0.4m
-1, long 7m, as shown in Figure 4, the nearly 8KW of the power output of femtosecond pulse, the about 200fs of pulsewidth, the double wave long value is respectively 1036nm and 1064nm.
The present invention is not limited to above-mentioned embodiment, and modification that essence any and of the present invention is identical or replacement all belong to protection scope of the present invention.
Claims (7)
1. dual-wavelength high-power self-similarity femtosecond pulse Yb-doping microstructure fiber laser, it is characterized in that by pumping laser light source (1), wave division multiplex coupler (2), positive dispersion monomode fiber (3), Yb-doping microstructure optical fiber (4), the polarizer (5), circulator (6), Polarization Controller (7), polarization-maintaining fiber grating (8) and output coupler (9) connect into optic fiber ring-shaped cavity with optical fiber, wave division multiplex coupler (2) comprises first port (21), second port (22) and the 3rd port (23), circulator (6) comprises first port (61), second port (62) and the 3rd port (63), output coupler (9) comprises first port (91), second port (92) and the 3rd port (93), pumping laser light source (1) is connected with first port (21) of wave division multiplex coupler (2), the 3rd port (23) of wave division multiplex coupler (2) is through positive dispersion monomode fiber (3), Yb-doping microstructure optical fiber (4), the polarizer (5) is connected to first port (61) of circulator (6), second port (62) of circulator (6) is connected to polarization-maintaining fiber grating (8) through Polarization Controller (7), the 3rd port (63) of circulator (6) is connected with first port (91) of output coupler (9), and second port (92) of output coupler (9) is connected to second port (22) of wave division multiplex coupler (2); The 3rd port (93) of output coupler (9) is connected with dispersive delay line (10); The airport radius of Yb-doping microstructure optical fiber (4) is 0.20～0.29 μ m, and the airport spacing is 1.82～2.3 μ m, doping content 10
24～10
25m
-3, length is 1～7m.
2. dual-wavelength high-power self-similarity femtosecond pulse Yb-doping microstructure fiber laser according to claim 1 is characterized in that: the second order GVD (Group Velocity Dispersion) value of positive dispersion monomode fiber (3) is more than or equal to 6.0 * 10
-1Ps
2m
-1, length is 6～12m.
3. dual-wavelength high-power self-similarity femtosecond pulse Yb-doping microstructure fiber laser according to claim 2, it is characterized in that: polarization-maintaining fiber grating (8) is based on the polarization-maintaining fiber grating of ordinary optic fibre or photonic crystal fiber, and its centre wavelength is positioned at 1030nm and 1064nm.
4. dual-wavelength high-power self-similarity femtosecond pulse Yb-doping microstructure fiber laser according to claim 1 is characterized in that: pumping laser light source (1) output Wavelength of Laser is 980nm.
5. dual-wavelength high-power self-similarity femtosecond pulse Yb-doping microstructure fiber laser according to claim 1 is characterized in that: the wave-length coverage of wave division multiplex coupler (2) is 976～1550nm.
6. dual-wavelength high-power self-similarity femtosecond pulse Yb-doping microstructure fiber laser according to claim 1 is characterized in that: output coupler (9) is high-power coupler, and coupling efficiency is 40～60%.
7. according to each described dual-wavelength high-power self-similarity femtosecond pulse Yb-doping microstructure fiber laser of claim 1 to 6, it is characterized in that: the second order GVD (Group Velocity Dispersion) value of dispersive delay line (10) is less than-1.0 * 10
-1Ps
2m
-1
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| CN101924319B (en) * | 2010-09-02 | 2011-11-02 | 中国科学院西安光学精密机械研究所 | All-fiber structure laser system capable of generating high-energy femtosecond pulse |
| CN102353486A (en) * | 2011-07-07 | 2012-02-15 | 天津大学 | Device for measuring active photonic crystal fiber pressure |
| CN102916329A (en) * | 2012-11-09 | 2013-02-06 | 天津理工大学 | Fourier domain mode locking optical fiber laser device |
| CN102983484A (en) * | 2012-12-24 | 2013-03-20 | 华南师范大学 | Bismuth-doped optical fiber laser with wavelength of mode-locked pulse capable of being dynamically tuned in wide range |
| CN103048809B (en) * | 2013-01-22 | 2015-04-08 | 杭州电子科技大学 | Delay adjustable device based on active fiber grating coupler |
| CN103190887A (en) * | 2013-03-29 | 2013-07-10 | 太原理工大学 | Scattered chaotic light tomography method |
| CN104215367B (en) * | 2014-08-28 | 2017-01-25 | 天津大学 | Multi-dimensional stress photonic crystal fiber testing device and method |
| CN105388559B (en) * | 2015-12-22 | 2018-10-30 | 华中科技大学 | A kind of optical fibre device based on inside of optical fibre lattice structure |
| CN105356212B (en) * | 2015-12-22 | 2018-10-09 | 华中科技大学 | A kind of optical fiber laser including inside of optical fibre lattice structure optical fibre device |
| CN106410578B (en) * | 2016-11-15 | 2018-12-28 | 长春理工大学 | 2 mu m waveband all -fiber dual wavelength broad tuning mode-locked lasers |
| CN111600185B (en) * | 2020-06-05 | 2021-03-05 | 中国科学院半导体研究所 | Dual-polarization optical fiber amplifier |
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