1064 nm激光泵浦D_2产生1560 nm拉曼激光
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摘要
以波长为1 064 nm的线偏振脉冲激光为泵浦源,以高压氘气作为拉曼介质,实现了波长为1 560 nm的一阶拉曼S_1、波长为2 920 nm的二阶拉曼S_2和后向一阶拉曼BS_1输出。采用透镜组双次聚焦的方法将S_1的光子转化效率提高到61.5%,S_1的最大单脉冲能量达到86.3 mJ,脉宽不超过10 ns。S_2和BS_1的最高光子转化效率分别超过12%和20%。此外,通过实验论证了压力对光子转化效率的影响,给出了进一步提高S_1的光子转化效率的方法。
In this paper, the first order Raman Stokes(S_1)with wavelength of 1 560 nm and the second order Raman Stokes(S_2) with wavelength of 2 920 nm and the backward first Stokes(BS_1) are generated by using a linear polarized pulsed laser with wavelength of 1 064 nm as pumped source and high pressure deuterium gas as Raman active medium. The maximum photon conversion efficiency of S_1 is 61.5%, the maximum single pulse output energy of S_1 is 86.3 mJ, and the pulse width of S_1 is not more than 10 ns. The highest photon conversion efficiencies of S_2 and BS_1 are more than 12% and 20%, respectively. The effect of pressure of deuterium on the conversion efficiency of S_1 is also verified experimentally, and the methods to further improve conversion efficiency of S_1 are also discussed.
In this paper, the first order Raman Stokes(S_1)with wavelength of 1 560 nm and the second order Raman Stokes(S_2) with wavelength of 2 920 nm and the backward first Stokes(BS_1) are generated by using a linear polarized pulsed laser with wavelength of 1 064 nm as pumped source and high pressure deuterium gas as Raman active medium. The maximum photon conversion efficiency of S_1 is 61.5%, the maximum single pulse output energy of S_1 is 86.3 mJ, and the pulse width of S_1 is not more than 10 ns. The highest photon conversion efficiencies of S_2 and BS_1 are more than 12% and 20%, respectively. The effect of pressure of deuterium on the conversion efficiency of S_1 is also verified experimentally, and the methods to further improve conversion efficiency of S_1 are also discussed.
引文
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[2]CARLSTEN J L,TELLE J M,WENZEL R G.Efficient stimulated Raman scattering due to absence of second stokes growth[J].Opt Lett,1984,9(8):353-355.
[3]CAI X L,ZHOU C H,ZHOU D J,et al.H2stimulated Raman scattering in a multi-pass cell with a Herriot configuration[J].Chin Phys Lett,2015,32(11):114207.
[4]ZHOU D J,GUO J W,ZHOU C H,et al.Intracavity CH4Raman laser using negative-branch unstable resonator[J].Opt Commun,2015,356:49-53.
[5]CARNUTH W,TRICKL T.A powerful eyesafe infrared aerosol lidar:Application of stimulated Raman backscattering of 1.06μm radiation[J].Rev Sci Instrum,1994,65(11):3 324-3 331.
[6]HE L J,LIU K,LIU Z,et al.1.5μm high-energy burstmode picoseconds pulsed lasers based on an optical parametric oscillator[J].Laser Phys Lett,2018,15(10):105003.
[7]AUBOURG A,DIDIERJEAN J,AUBRY N,et al.Passively Q-switched diode-pumped Er:YAG solid-state laser[J].Opt Lett,2013,38(6):938-940.
[8]HANNA D C,POINTER D J,PRATT D J.Stimulated Raman scattering of picosecond light pulses in hydrogen,deuterium,and methane[J].IEEE J Quantum Electron,1986,22(2):332-336.
[9]SPULER S M,MAYOR S D.Raman shifter optimized for lidar at a 1.5μm wavelength[J].Appl Opt,2007,46(15):2 990-2 995.
[10]LIU D,CAI X L,LI Z H,et al.The threshold reduction of SRS in deuterium by multi-pass configuration[J].Opt Commun,2016,379:36-40.
[11]WANG Z F,BELARDI W,YU F,et al.Efficient diodepumped mid-infrared emission from acetylene-filled hollowcore fiber[J].Opt Exp,2014,22(18):21 872-21 878.
[12]HOOPER W P,FRICK G M,MICHAEL B P.Using backward Raman scattering from coupled deuterium cells for wavelength shifting[J].Opt Eng,2009,48(8):084302.
[13]冷静.气体中的受激拉曼散射研究及其在激光波长转换中的应用[D].大连:中国科学院大连化学物理研究所,2006.(LENG Jing.Study on stimulated Raman scattering in gas medium and its application in laser wavelength conversion[D].Dalian:Dalian Institute of Chemical Physics,Chinese Academy of Sciences,2006.)