父脉冲参数对飞秒脉冲相干合成质量的影响
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摘要
利用解析方法研究了父脉冲参数对合成脉冲宽度和质量的影响。研究结果表明,两个父脉冲具有相近的脉冲宽度和脉冲能量时,合成脉冲的时域质量较高。减小父脉冲时域宽度可以有效减小合成脉冲基底。为了验证这一相干脉冲合成的优化方法,在不同的非线性光纤中,对分束后的掺镱光纤飞秒激光器的输出脉冲分别进行非线性频率变换,获得了两个小于30 fs的脉冲,再将二者进行相干脉冲合成,获得了合成脉冲宽度为8 fs的少周期脉冲。
The effects of the parent pulse parameters on the width and quality of the synthesized pulse are investigated using an analytical method. The research results show that the time-domain quality of the synthesized pulse can be improved when the two parent pulses exhibit similar widths and energies, and the substrate of the synthesized pulse can be reduced by decreasing the time-domain widths of parent pulses. In order to verify the optimizing method for pulse coherent synthesis, the pulse output obtained from the Yb~(3+)-doped fiber femtosecond laser system is first divided into two branches, then they are treated by nonlinear frequency conversion in different nonlinear fibers, respectively, and finally two pulses with pulse durations of less than 30 fs are obtained. These two pulses are further coherently synthesized. Consequently, after coherent synthesis, a few-cycle laser pulse with a pulse duration of 8 fs is realized.
The effects of the parent pulse parameters on the width and quality of the synthesized pulse are investigated using an analytical method. The research results show that the time-domain quality of the synthesized pulse can be improved when the two parent pulses exhibit similar widths and energies, and the substrate of the synthesized pulse can be reduced by decreasing the time-domain widths of parent pulses. In order to verify the optimizing method for pulse coherent synthesis, the pulse output obtained from the Yb~(3+)-doped fiber femtosecond laser system is first divided into two branches, then they are treated by nonlinear frequency conversion in different nonlinear fibers, respectively, and finally two pulses with pulse durations of less than 30 fs are obtained. These two pulses are further coherently synthesized. Consequently, after coherent synthesis, a few-cycle laser pulse with a pulse duration of 8 fs is realized.
引文
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[2] Knight J C,Birks T A,Russell P S J,et al.All-silica single-mode optical fiber with photonic crystal cladding[J].Optics Letters,1996,21(19):1547-1549.
[3] Heidt A M,Hartung A,Bosman G W,et al.Coherent octave spanning near-infrared and visible supercontinuum generation in all-normal dispersion photonic crystal fibers[J].Optics Express,2011,19(4):3775-3787.
[4] Hundertmark H,Rammler S,Wilken T,et al.Octave-spanning supercontinuum generated in SF6-glass PCF by a 1060 nm mode-locked fibre laser delivering 20 pJ per pulse[J].Optics Express,2009,17(3):1919-1924.
[5] Dudley J M,Coen S.Fundamental limits to few-cycle pulse generation from compression of supercontinuum spectra generated in photonic crystal fiber[J].Optics Express,2004,12(11):2423-2428.
[6] Zhang J H,Hu M L,Liu B W,et al.Amplification of dissipative soliton and supercontinuum generation[J].Chinese Journal of Lasers,2014,41(4):0405003.张巨慧,胡明列,刘博文,等.耗散孤子脉冲的放大和超连续光谱的产生[J].中国激光,2014,41(4):0405003.
[7] Dudley J M,Genty G,Coen S.Supercontinuum generation in photonic crystal fiber[J].Reviews of Modern Physics,2006,78(4):1135-1184.
[8] Mu J,Zhou K N,Wang X,et al.Effect of wavefront distortion on beam pointing detection in coherent combination of large aperture beams[J].Chinese Journal of Lasers,2017,44(6):0605001.母杰,周凯南,王逍,等.波前畸变对大口径光束相干合成中光束指向探测的影响[J].中国激光,2017,44(6):0605001.
[9] Wang X L,Zhou P,Su R T,et al.Current situation,tendency and challenge of coherent combining of high power fiber lasers[J].Chinese Journal of Lasers,2017,44(2):0201001.王小林,周朴,粟荣涛,等.高功率光纤激光相干合成的现状、趋势与挑战[J].中国激光,2017,44(2):0201001.
[10] Jiang M,Ma P F,Zhou P,et al.Performance of laser beam combination system based on brightness[J].Acta Optica Sinica,2017,37(7):0714001.姜曼,马鹏飞,周朴,等.基于亮度的激光光束合成系统性能[J].光学学报,2017,37(7):0714001.
[11] Manzoni C,Mücke O D,Cirmi G,et al.Coherent pulse synthesis:towards sub-cycle optical waveforms[J].Laser & Photonics Reviews,2015,9(2):129-171.
[12] Fan J T,Gu C L,Shi H S,et al.Generation of 3.9-cycle pulses from the coherent synthesis of two continuous-wave injection seeded optical parametric amplifiers at 53 MHz[J].Optics Letters,2018,43(22):5579-5582.
[13] Kim J W,Song Y J.Ultralow-noise mode-locked fiber lasers and frequency combs:principles,status,and applications[J].Advances in Optics and Photonics,2016,8(3):465-540.
[14] Krauss G,Lohss S,Hanke T,et al.Synthesis of a single cycle of light with compact erbium-doped fibre technology[J].Nature Photonics,2010,4(1):33-36.
[15] Huang S W,Cirmi G,Moses J,et al.High-energy pulse synthesis with sub-cycle waveform control for strong-field physics[J].Nature Photonics,2011,5(8):475-479.
[16] Manzoni C,Huang S W,Cirmi G,et al.Coherent synthesis of ultra-broadband optical parametric amplifiers[J].Optics Letters,2012,37(11):1880-1882.
[17] Peng T D,Liu B W,Zhang J H,et al.Generation of few-cycle femtosecond pulses via coherent synthesis based on self-frequency-shifted solitons in all-solid-state photonic bandgap fiber[J].Chinese Journal of Lasers,2015,42(7):0702006.彭天铎,刘博文,张巨慧,等.基于全固光子带隙光纤中自频移孤子的相干合成产生少周期飞秒激光脉冲[J].中国激光,2015,42(7):0702006.
[18] Cox J A,Putnam W P,Sell A,et al.Pulse synthesis in the single-cycle regime from independent mode-locked lasers using attosecond-precision feedback[J].Optics Letters,2012,37(17):3579-3581.
[19] Fong B J,Lin W T,Wu S Y,et al.Relative carrier-envelope phase stabilization of hybridly synchronized ultrafast Yb and Er fiber-laser systems with the feed-forward scheme[J].Optics Letters,2015,40(6):966-969.
[20] Schibli T R,Kim J,Kuzucu O,et al.Attosecond active synchronization of passively mode-locked lasers by balanced cross correlation[J].Optics Letters,2003,28(11):947-949.
[21] Tian H C,Song Y J,Meng F,et al.Long-term stable coherent beam combination of independent femtosecond Yb-fiber lasers[J].Optics Letters,2016,41(22):5142-5145.
[22] Wang S J,Liu B W,Gu C L,et al.Self-similar evolution in a short fiber amplifier through nonlinear pulse preshaping[J].Optics Letters,2013,38(3):296-298.
[23] Heidt A M.Pulse preserving flat-top supercontinuum generation in all-normal dispersion photonic crystal fibers[J].Journal of the Optical Society of America B,2010,27(3):550-559.
[24] Tu H H,Boppart S A.Optical frequency up-conversion by supercontinuum-free widely-tunable fiber-optic Cherenkov radiation[J].Optics Express,2009,17(12):9858-9872.