激光偏振态对光纤型太赫兹时域光谱仪的影响
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摘要
采用光纤飞秒激光器与光纤耦合型太赫兹光电导天线相结合的方案,设计并研制了光纤型太赫兹时域光谱系统。通过实验研究了激光偏振态对太赫兹时域波形、强度以及光谱特性的影响,通过对飞秒激光偏振态的精确控制与优化,消除了时域脉冲分裂现象,获得了高信噪比的单脉冲太赫兹时域波形。
A fiber-type terahertz(THz) time-domain spectrometer is designed by combining a fiber femtosecond laser with a fiber-coupled THz photoconductive antenna. The effect of laser polarization on the THz time-domain waveform, intensity, and spectral characteristics are studied experimentally. Via the precise control and the optimization of the polarization state of the femtosecond laser, the time-domain pulse splitting is eliminated, and a single-peak THz time-domain pulse with a high signal-to-noise ratio is obtained.
A fiber-type terahertz(THz) time-domain spectrometer is designed by combining a fiber femtosecond laser with a fiber-coupled THz photoconductive antenna. The effect of laser polarization on the THz time-domain waveform, intensity, and spectral characteristics are studied experimentally. Via the precise control and the optimization of the polarization state of the femtosecond laser, the time-domain pulse splitting is eliminated, and a single-peak THz time-domain pulse with a high signal-to-noise ratio is obtained.
引文
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[2] Du S Q,Li H,Xie L,et al.Vibrational frequencies of anti-diabetic drug studied by terahertz time-domain spectroscopy[J].Applied Physics Letters,2012,100(14):143702.
[3] Ryu C H,Park S H,Kim D H,et al.Nondestructive evaluation of hidden multi-delamination in a glass-fiber-reinforced plastic composite using terahertz spectroscopy[J].Composite Structures,2016,156:338-347.
[4] Parrott E P J,Sun Y W,Pickwell-Macpherson E.Terahertz spectroscopy:its future role in medical diagnoses[J].Journal of Molecular Structure,2011,1006(1/2/3):66-76.
[5] Yang M W,Ji H B,Tan Z Y,et al.Terahertz joint analyzer with imaging and spectrum detection[J].Acta Optica Sinica,2016,36(6):0611004.杨旻蔚,季海兵,谭智勇,等.成像与成谱联动的太赫兹分析检测仪[J].光学学报,2016,36(6):0611004.
[6] Dietz R J B,Gerhard M,Stanze D,et al.THz generation at 1.55 μm excitation:six-fold increase in THz conversion efficiency by separated photoconductive and trapping regions[J].Optics Express,2011,19(27):25911-25917.
[7] Roehle H,Dietz R J B,Hensel H J,et al.Next generation 1.5 μm terahertz antennas:mesa-structuring of InGaAs/InAlAs photoconductive layers[J].Optics Express,2010,18(3):2296-2301.
[8] Sartorius B,Künzel H,Biermann K,et al.THz photoconductive antennas for 1.55 μm telecom wavelengths[C]//Optical Terahertz Science and Technology,March 18-21,2007,Orlando,Florida United States.Washington D.C.:OSA,2007:ME6.
[9] Yang Y,Sun Q,Deng Y Q,et al.Study on beat signal with high signal-to-noise ratio in terahertz frequency measurement[J].Chinese Journal of Lasers,2017,44(6):0604006.杨奕,孙青,邓玉强,等.太赫兹频率测量中高信噪比拍频信号的研究[J].中国激光,2017,44(6):0604006.
[10] Sun Q,Yang Y,Meng F,et al.High-precision measurement of terahertz frequency based on frequency comb[J].Acta Optica Sinica,2016,36(4):0412002.孙青,杨奕,孟飞,等.基于频率梳的太赫兹频率精密测量方法研究[J].光学学报,2016,36(4):0412002.
[11] Vieweg N,Rettich F,Deninger A,et al.Terahertz-time domain spectrometer with 90 dB peak dynamic range[J].Journal of Infrared,Millimeter,and Terahertz Waves,2014,35(10):823-832.
[12] Sartorius B,Roehle H,Künzel H,et al.All-fiber terahertz time-domain spectrometer operating at 1.5 μm telecom wavelengths[J].Optics Express,2008,16(13):9565-9570.
[13] Ohno Y,Inoue R,Tonouchi M.Fiber-coupled compact terahertz system[C]//2005 International Topical Meeting on Microwave Photonics,October 14-14,2005,Seoul,Korea.New York:IEEE,2005:293-296.
[14] Fan S T,Parrott E P J,Pickwell-Macpherson E.Removing the ‘double-pulse’ problem in polarization maintaining fiber delivery of femtosecond laser in terahertz systems[C]//2012 37th International Conference on Infrared,Millimeter,and Terahertz Waves,September 23-28,2012,Wollongong,NSW,Australia.New York:IEEE,2012:13192522.
[15] Kaminow I P.Polarization-maintaining fibers[J].Applied Scientific Research,1984,41(3/4):257-270.
[16] Noda J,Okamoto K,Sasaki Y.Polarization-maintaining fibers and their applications[J].Journal of Lightwave Technology,1986,4(8):1071-1089.
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