基于激光成丝的太赫兹时域光谱系统研究综述
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摘要
太赫兹时域光谱(THz-TDS)技术是一种使用相干探测的频谱分析手段。THz-TDS系统集太赫兹波发射器与探测器于一体,通过相干探测,可以同时获取太赫兹脉冲的电场强度和相位信息,广泛用于生物、材料、安检等领域。超快激光成丝产生太赫兹波是当前产生宽频谱、高强度太赫兹辐射的一个重要途径。文章详细介绍了超快激光成丝辐射太赫兹波的主流物理机制以及增强、调控太赫兹波的主要方法,阐述了基于激光成丝的THz-TDS系统的探测原理和探测手段。
Terahertz time-domain spectroscopy(THz-TDS) uses coherent detection method for spectrum analysis. The THz-TDS system integrates terahertz emitter and detector, which can simultaneously acquire the field intensity and phase information of terahertz pulses and be widely used in biology, materials, security, and other fields. The THz pulse induced by the ultrafast laser filament is an important way to generate wide-spectrum and high-intensity THz radiation. In this paper, the physical mechanisms of ultrafast laser filament radiated THz waves and the methods of enhancing and regulating THz waves are introduced in detail. The detection principle and methods of the THz-TDS system based on laser filamentation are described.
Terahertz time-domain spectroscopy(THz-TDS) uses coherent detection method for spectrum analysis. The THz-TDS system integrates terahertz emitter and detector, which can simultaneously acquire the field intensity and phase information of terahertz pulses and be widely used in biology, materials, security, and other fields. The THz pulse induced by the ultrafast laser filament is an important way to generate wide-spectrum and high-intensity THz radiation. In this paper, the physical mechanisms of ultrafast laser filament radiated THz waves and the methods of enhancing and regulating THz waves are introduced in detail. The detection principle and methods of the THz-TDS system based on laser filamentation are described.
引文
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[14] Zhang X C,Hu B B,Darrow J T,et al.Generation of femtosecond electromagnetic pulses from semiconductor surfaces[J].Applied Physics Letters,1990,56(11):1011-1013.
[15] Auston D H.Picosecond optoelectronic switching and gating in silicon[J].Applied Physics Letters,1975,26(3):101-103.
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[22] Wu Q,Zhang X C.Free-space electro-optics sampling of mid-infrared pulses[J].Applied Physics Letters,1997,71(10):1285-1286.
[23] Matsubara E,Nagai M,Ashida M.Ultrabroadband coherent electric field from far infrared to 200 THz using air plasma induced by 10 fs pulses[J].Applied Physics Letters,2012,101(1):011105.
[24] Liu J L,Dai J M,Chin S L,et al.Broadband terahertz wave remote sensing using coherent manipulation of fluorescence from asymmetrically ionized gases[J].Nature Photonics,2010,4(9):627-631.
[25] Couairon A,Mysyrowicz A.Femtosecond filamentation in transparent media[J].Physics Reports,2007,441(2/3/4):47-189.
[26] Braun A,Korn G,Liu X,et al.Self-channeling of high-peak-power femtosecond laser pulses in air[J].Optics Letters,1995,20(1):73-75.
[27] Hauri C P,Kornelis W,Helbing F W,et al.Generation of intense,carrier-envelope phase-locked few-cycle laser pulses through filamentation[J].Applied Physics B,2004,79(6):673-677.
[28] Stibenz G,Zhavoronkov N,Steinmeyer G.Self-compression of millijoule pulses to 7.8 fs duration in a white-light filament[J].Optics Letters,2006,31(2):274-276.
[29] Kasparian J,Rodriguez M,Mejean G,et al.White-light filaments for atmospheric analysis[J].Science,2003,301(5629):61-64.
[30] Méjean G,Kasparian J,Yu J,et al.Remote detection and identification of biological aerosols using a femtosecond terawatt lidar system[J].Applied Physics B,2004,78(5):535-537.
[31] Hamster H,Sullivan A,Gordon S,et al.Subpicosecond,electromagnetic pulses from intense laser-plasma interaction[J].Physical Review Letters,1993,71(17):2725-2728.
[32] Chin S L,Hosseini S A,Liu W,et al.The propagation of powerful femtosecond laser pulses in optical media:physics,applications,and new challenges[J].Canadian Journal of Physics,2005,83(9):863-905.
[33] D′Amico C,Houard A,Franco M,et al.Conical forward THz emission from femtosecond-laser-beam filamentation in air[J].Physical Review Letters,2007,98(23):235002.
[34] Xie X,Dai J M,Zhang X C.Coherent control of THz wave generation in ambient air[J].Physical Review Letters,2006,96(7):075005.
[35] Zhang Y,Chen Y,Marceau C,et al.Non-radially polarized THz pulse emitted from femtosecond laser filament in air[J].Optics Express,2008,16(20):15483-15488.
[36] Kim K Y,Glownia J H,Taylor A J,et al.Terahertz emission from ultrafast ionizing air in symmetry-broken laser fields[J].Optics Express,2007,15(8):4577-4584.
[37] Kim K Y,Taylor A J,Glownia J H,et al.Coherent control of terahertz supercontinuum generation in ultrafast laser-gas interactions[J].Nature Photonics,2008,2(10):605-609.
[38] Bai Y,Song L W,Xu R J,et al.Waveform-controlled terahertz radiation from the air filament produced by few-cycle laser pulses[J].Physical Review Letters,2012,108(25):255004.
[39] Li M,Li W X,Shi Y,et al.Verification of the physical mechanism of THz generation by dual-color ultrashort laser pulses[J].Applied Physics Letters,2012,101(16):161104.
[40] Oh T I,You Y S,Kim K Y.Two-dimensional plasma current and optimized terahertz generation in two-color photoionization[J].Optics Express,2012,20(18):19778-19786.
[41] You Y S,Oh T I,Kim K Y.Mechanism of elliptically polarized terahertz generation in two-color laser filamentation[J].Optics Letters,2013,38(7):1034-1036.
[42] Zhang L L,Wang W M,Wu T,et al.Observation of terahertz radiation via the two-color laser scheme with uncommon frequency ratios[J].Physical Review Letters,2017,119(23):235001.
[43] Karpowicz N,Zhang X C.Coherent terahertz echo of tunnel ionization in gases[J].Physical Review Letters,2009,102(9):093001.
[44] Wu H C,Meyer-ter-Vehn J,Ruhl H,et al.Terahertz radiation from a laser plasma filament[J].Physical Review E,2011,83(3):036407.
[45] Bergé L,Skupin S,K?hler C,et al.3D numerical simulations of THz generation by two-color laser filaments[J].Physical Review Letters,2013,110(7):073901.
[46] Liu W W,Zhao J Y,Zhang Y Z,et al.Research on superluminal propagation of terahertz wave during femtosecond laser filamentation[J].Infrared and Laser Engineering,2016,45(4):0402001.刘伟伟,赵佳宇,张逸竹,等.飞秒激光成丝过程中的太赫兹波超光速传输现象研究[J].红外与激光工程,2016,45(4):0402001.
[47] Zhao J Y,Chu W,Wang Z,et al.Strong spatial confinement of terahertz wave inside femtosecond laser filament[J].ACS Photonics,2016,3(12):2338-2343.
[48] L?ffler T,Jacob F,Roskos H G.Generation of terahertz pulses by photoionization of electrically biased air[J].Applied Physics Letters,2000,77(3):453-455.
[49] Houard A,Liu Y,Prade B,et al.Strong enhancement of terahertz radiation from laser filaments in air by a static electric field[J].Physical Review Letters,2008,100(25):255006.
[50] Wang T J,Marceau C,Chen Y P,et al.Terahertz emission from a dc-biased two-color femtosecond laser-induced filament in air[J].Applied Physics Letters,2010,96(21):211113.
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