200 Hz高重复频率SBS脉宽压缩实验研究
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摘要
受激布里渊散射(SBS)脉宽压缩是实现高峰值功率、短脉冲激光输出的重要途径之一,然而,目前SBS脉宽压缩仅限于1~10 Hz低重复频率激光器,限制了高重频短脉冲激光器在激光雷达、空间碎片探测以及目标成像等领域的应用。基于此,开展了高重复频率下的SBS脉宽压缩实验研究。设计搭建了高重复频率的主振荡放大激光器,开展了SBS二次级联脉宽压缩和SBS振荡放大双池脉宽压缩实验。通过SBS二次级联压缩实现了脉冲宽度从~32 ns压缩到~1.9 ns,脉宽压缩比达16倍;而通过SBS振荡放大双池结构实现了脉冲宽度从~4 ns压缩到376 ps,脉宽压缩比达10倍。实验结果表明,采用该超净封闭型SBS相位共轭镜,在Stokes光输出能量达50 m J时,无光学击穿现象,实现了在200 Hz高重复频率下的SBS脉宽压缩。
Stimulated Brillouin scattering( SBS) pulse width compression is one of the important pathway to achieve high peak power and short pulse output. However,the current SBS pulse with compression is limited to1 ~ 10 Hz low repetition frequency lasers,which limits the application of high repetition frequency short pulse lasers in the fields of laser radar,space debris detection,target imaging. Therefore,the experimental study of SBS pulse width compression at high repetition frequency is carried out. The main oscillation amplification laser with high repetition frequency is designed and the SBS secondary cascade pulse width compression and SBS oscillation amplification double pool pulse width compression experiments are carried out. Through SBS secondary cascade compression,the pulse width is compressed from ~ 32 ns to ~ 1. 9 ns,and the pulse width compression ratio is up to 16 times. The SBS oscillation amplification double-cell structure realizes the pulsewidth from ~ 4 ns to 376 ps,and the pulse width compression ratio is up to 10 times. The experimental results show that no optical breakdown occurred in case of the ultra-clean closed SBS phase conjugation mirror when the output power of Stokes light reaches 50 m J,thus achieving SBS pulse width compression at a high repetition rate of 200 Hz.
Stimulated Brillouin scattering( SBS) pulse width compression is one of the important pathway to achieve high peak power and short pulse output. However,the current SBS pulse with compression is limited to1 ~ 10 Hz low repetition frequency lasers,which limits the application of high repetition frequency short pulse lasers in the fields of laser radar,space debris detection,target imaging. Therefore,the experimental study of SBS pulse width compression at high repetition frequency is carried out. The main oscillation amplification laser with high repetition frequency is designed and the SBS secondary cascade pulse width compression and SBS oscillation amplification double pool pulse width compression experiments are carried out. Through SBS secondary cascade compression,the pulse width is compressed from ~ 32 ns to ~ 1. 9 ns,and the pulse width compression ratio is up to 16 times. The SBS oscillation amplification double-cell structure realizes the pulsewidth from ~ 4 ns to 376 ps,and the pulse width compression ratio is up to 10 times. The experimental results show that no optical breakdown occurred in case of the ultra-clean closed SBS phase conjugation mirror when the output power of Stokes light reaches 50 m J,thus achieving SBS pulse width compression at a high repetition rate of 200 Hz.
引文
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[2]孟庆季,张续严,周凌,等.机载激光3D探测成像系统的关键技术[J].中国光学,2011,4(4):327-339.MENG Q J,ZHANG J Y,ZHOU L,et al..Key technologies of airborne laser 3D detection imaging system[J].Chinese Optics,2011,4(4):327-339.(in Chinese)
[3]KMETIK V,FIEDOROWICZ H,ANDREEV A A,et al..Reliable stimulated brillouin scattering compression of Nd∶YAG laser pulses with liquid fluorocarbon for long-time operation at 10 Hz[J].Applied Optics,1998,37(30):7085.
[4]李秦川,杨亚培,刘爽,等.相位共轭谐振腔改善激光器波前像差特性研究[J].光学与光电技术,2013,11(1):21-24.LI Q C,YANG Y P,LIU SH,et al..Characteristics of phase conjugated resonator to improve the laser wavefront aberrations[J].Optics&Optoelectronic Technology,2013,11(1):21-24.(in Chinese)
[5]汪莎,陈军,童立新,等.熔石英棒-光纤组合型相位共轭镜的研究[J].光学与光电技术,2008,6(1):5-7.WANG SH,CHEN J,TONG L X,et al..Fused silica rod-fiber combined phase conjugation mirror[J].Optics&Optoelectronic Technology,2008,6(1):5-7.(in Chinese)
[6]DANE C B,NEUMAN W A,HACKEL L A.High-energy SBS pulse compression[J].IEEE Journal of Quantum Electronics,1994,30(8):1907-1915.
[7]MITRA A,YOSHIDA H,FUJITA H,et al..Sub nanosecond pulse generation by stimulated brillouin scattering using FC-75 in an integrated setup with laser energy up to 1.5 J[J].Japanese Journal of Applied Physics,2006,45(3A):1607-1611.
[8]OGINO J,MIYAMOTO S,MATSUYAMA T,et al.Two-stage optical parametric chirped-pulse amplifier using sub-nanosecond pump pulse generated by stimulated Brillouin scattering compression[J].Applied Physics Express,2014,7(12):122702.
[9]TARASOV A A,CHU H.Subnanosecond Nd:YAG laser with multipass cell for SBS pulse compression[J].Proc.of SPIE,2017,10082:100820Q.
[10]YOSHIDA H,FUJITA H,NAKATSUKA M,et al..A 160 ps pulse generation by stimulated Brillouin scattering-phase conjugation mirror at 1064 nm wavelength[C]//European Conference on Lasers and Electro-Optics 2009 and the European Quantum Electronics Conference.Cleo Europe-Eqec.IEEE,2009:1-1.
[11]YOSHIDA H,HATAE T,FUJITA H,et al..A high-energy 160-ps pulse generation by stimulated Brillouin scattering from heavy fluorocarbon liquid at 1 064 nm wavelength.[J].Optics Express,2009,17(16):13654-13662.
[12]FRITSCHE H.Pulse compression and beam quality improvement of a single-frequency Nd∶YAG MOPA system[J].Proc.of SPIE,2013,8600:860005.
[13]XU X,FENG C,DIELS J C.Optimizing sub-ns pulse compression for high energy application[J].Optics Express,2014,22(11):13904.
[14]FENG C,XU X,DIELS J C.High-energy sub-phonon lifetime pulse compression by stimulated Brillouin scattering in liquids[J].Optics Express,2017,25:12421.
[15]BAI Z,WANG Y,LU Z,et al..High Energy,high compact single frequency hundred picoseconds laser based on stimulated brillouin scattering pulse compression[C]//Compact EUV&X-ray Light Sources,Long Beach,California,USA,2016:JM7A.3.
[16]ZHANG H,ZHU X,WANG Y,et al..Generation of 360 ps laser pulse with 3 J energy by stimulated Brillouin scattering with a nonfocusing scheme[J].Optics Express,2015,23(18):23318-28.
[17]SHILOV A A,PASMANIK G A,KULAGIN O V,et al..High-peak-power diode-pumped Nd∶YAG laser with a Brillouin phase-conjugation-pulse[J].Optics Letters,2001,26(20):1565-1567.
[18]WANG Y,LV Z,GUO Q,et al..A new circulating two-cell structure for stimulated Brillouin scattering phase conjugation mirrors with 1-J load and 10-Hz repetition rate[J].Chinese Optics Letters,2010,8(11):1064-1066.
[19]WANG Y L,LU Z W,LI Y,et al..Investigation on high-power load ability of stimulated Brillouin scattering phase conjugating mirror[J].Applied Physics B,2010,98(2-3):391-395.