宽带THz波的光谱整形及Kerr效应对THz波探测的影响
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摘要
基于光学整流原理的THz波时域光谱技术是一种非常有效的电磁辐射相位相干测试技术。该技术在当当今广泛的研究领域扮演着越来越重要的角色。本论文采用理论与实验相结合的方法,利用我们实验室自行搭建的THz时域光谱实验系统,对于THz波发射过程所诱导的Kerr效应进行了实验研究,同时研究了一种宽带THz波光谱整形方法。本论文主要包括以下几方面工作:
1、在大量阅读文献的基础上,综述了THz科学技术的产生、探测和应用。
2、介绍了基于光学整流原理的THz波产生和利用线性电光效应探测THz辐射的基本原理。
3、在实验室原有的自行搭建的以自锁模Ti: sapphire飞秒激光器为激励源建立的THz波时域光谱实验装置的基础上,将其改装成迈克尔逊干涉仪型THz波光谱整形实验装置,进行了基于干涉原理对宽带THz波光谱整形的实验研究。
4、详细讨论了基于光学整流的THz波产生过程中诱导的Kerr效应和类Kerr效应,并给出THz产生过程中所诱导的区分Kerr效应和二阶非线性级联的实验方法。
Terahertz time-domain spectrometry (THz-TDS) based on optical rectification is an effective phase-coherent photometric method by which one can directly measure the time-resolved electric-field both amplitude and phase of a subpicosecond THz radiation pulse generated by the mode-locked femtosecond pulse laser. At present, this technology is playing a more and more important role in many research fields. In this dissertation, some experimental research of THz is developed based on THz-TDS system. The main works are classified as follows:
1. The most recent results of THz science and technology were reviewed.
2. The principle of generating and detecting THz radiation is introduced.
3. Using the homemade Self-mode-locked Ti: sapphire femtosecond pulse laser as a pump source,a THz Michelson interference setup based on THz-TDS is built. Using the setup, spectrum shaping based on the principle of interference is investigated in detail.
4. Kerr nonlinearity and Kerr-like nonlinearity induced by femtosecond pulses via terahertz generation and electro-optical effect are investigated. A method to distinguish the two signals experimentally is proposed.
1、在大量阅读文献的基础上,综述了THz科学技术的产生、探测和应用。
2、介绍了基于光学整流原理的THz波产生和利用线性电光效应探测THz辐射的基本原理。
3、在实验室原有的自行搭建的以自锁模Ti: sapphire飞秒激光器为激励源建立的THz波时域光谱实验装置的基础上,将其改装成迈克尔逊干涉仪型THz波光谱整形实验装置,进行了基于干涉原理对宽带THz波光谱整形的实验研究。
4、详细讨论了基于光学整流的THz波产生过程中诱导的Kerr效应和类Kerr效应,并给出THz产生过程中所诱导的区分Kerr效应和二阶非线性级联的实验方法。
Terahertz time-domain spectrometry (THz-TDS) based on optical rectification is an effective phase-coherent photometric method by which one can directly measure the time-resolved electric-field both amplitude and phase of a subpicosecond THz radiation pulse generated by the mode-locked femtosecond pulse laser. At present, this technology is playing a more and more important role in many research fields. In this dissertation, some experimental research of THz is developed based on THz-TDS system. The main works are classified as follows:
1. The most recent results of THz science and technology were reviewed.
2. The principle of generating and detecting THz radiation is introduced.
3. Using the homemade Self-mode-locked Ti: sapphire femtosecond pulse laser as a pump source,a THz Michelson interference setup based on THz-TDS is built. Using the setup, spectrum shaping based on the principle of interference is investigated in detail.
4. Kerr nonlinearity and Kerr-like nonlinearity induced by femtosecond pulses via terahertz generation and electro-optical effect are investigated. A method to distinguish the two signals experimentally is proposed.
引文
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[21] Ajay Nahata, Aniruddha S. Weling, and Tony F. Heinz, A wideband coherent terahertz spectroscopy system using optical rectification and electro-optic sampling, Appl. Phys. Lett. 1996, 69, 2321-2323
[22] M. Reid and R. Fedosejevs, Terahertz emission from surface optical rectification in n-InAs,Proc. SPIE Int. Soc. Opt. Eng. 2004, 5577:659
[23] Hashimshony D,Zigler A,Papadopoulos D.Phys.Rev.Lett.2001,86:2806
[24] van der Weide D W, Murakowski J, Keilmarm F, IEEE Trans.Microwave Theory Tech.,2000, 48:740
[25] 周泽魁,张同军,张光新,太赫兹波科学和技术,自动化仪表,2006,27(3):1-6
[26] 廖复疆,微型真空电子器件和太赫兹辐射源技术进展,电子学报,2003,21(9):1361—1364
[27] Taniuchi T,Nakanishi H.Continuously tunable terahertz-wave generation inGaP crystal by collinear difference frequency mixing.Electronics Letters,2004.3,4o(5):327—328.
[28] Taniuehi T. Shikata J. Tunable terahertz-wave generation in DAST crystal with dual wavelength KTP optical parametric oscillator. Electronics Letters,2000,36(16):1414—1416.
[29] G. M. H. Knippels, X. Yan, A. M. MacLeod, W. A. Gillespie, M. Yasumoto, D. Oepts and A. F. G. van derMeer, Generation and complete electric-field characterization of intense ultrashort tunable far-infrared laser pulses, Phys. Rev. Lett. 1999, 83:1578-1581
[30] Mark Sherwin, Applied physics: Terahertz power, Nature, 2002, 42(6912): 131-132
[31] E. Gerecht, C. F. Musante, Y. Zhuang, K. S. Yngevesson, T. Goyetter,J. C. Dickinson, J. Waldman, P. A. Yagoubov, G. Gol'tsman, B. M.Voronov, and E. M. Gershenzon, NbN hot-electron bolometricmixers-a new technology for low-noise THz receivers, IEEE Trans.Microwave Theory Tech. 1999, 47:2519-2527
[32] P. Dieleman, T. M. Klapwijk, J. R. Gao, and H. van de Stadt, Analysis of Nb superconductor insulator superconductor tunnel junctions with Al striplines for THz radiation detection, IEEE Trans. Applied Superconductivity 1997, 7:2566-2569
[33] A. A. Madej, K. J. Siemsen, Absolute heterodyne frequency measurement of the 88Sr+ 455-THz S-D single ion transition, Optics Letters, 1996, 21(11): 824-826
[34] G. Mourou, C. V. Stancampiano, and D. Blumenthal, Picosecond microwave pulse generation, Appl. Phys. Lett. 1981, 38: 470 -472
[35] D. H. Auston, K. P. Cheung, and P. R. Smith, Picosecond photoconducting Hertzian dipoles Appl. Phys. Lett. 1984, 45:284-286
[36] A. P. DeFonzo, M. Jarwala, and C. R. Lutz, Transient response of planar integrated optoelectronic antennas, Appl. Phys. Lett. 1987, 50:1155-1157
[37] Ch. Fattinger and D. Grischkowsky, Point source terahertz optics, Appl. Phys. Lett. 1988, 53:1480-1482
[38] P. R. Smith, D. H. Auston, and M. C. Nuss, Subpicosecond Photoconducting dipole antennas, IEEE J. Quantum Electron. 1988, 24:255-260
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