基于光场离化电流机制产生强太赫兹辐射的参数优化研究

张铠云; 杜海伟; 陈民; 盛政明

doi:10.7498/aps.61.160701

摘要

基于超短激光脉冲与气体作用通过光场离化电流产生太赫兹(THz)辐射的模型, 研究了用双色激光脉冲的方法产生强THz辐射的优化参数条件. 数值计算表明, 导致THz辐射产生的离化电流主要是由一阶电离过程产生的, 高阶离化对该电流产生的贡献很小. 通过调节基频光与倍频光的配比、相位差都能增大离化电流, 从而可以提高THz辐射振幅. 将激光波长拓展到中红外波段, 也有利于提高离化电流. 此外,改变作用气体的种类也能改变离化电流. 在激光和密度参数相等的情况下, 在氦气中可以产生高于氮气中2倍左右的离化电流.

关键词:

Abstract

Based on the theoretical model of field ionization current for terahertz (THz) emission in laser-gas interaction, the parameter optimization for strong THz emission via the two-color laser scheme is explored. It is found from numerical calculation that the ionization current is due mainly to the first-order ionization process and the contribution from high-order ionization is ignorable. In order to produce stronger THz emission, the ionization current can be enhanced by adjusting the amplitude ratio between the fundamental and its second harmonic laser pulses as well as their relative phase difference. The ionization current can also be increased by use of laser pulses at mid-infrared and by changing the gas species. Under the same laser pulse and gas density conditions, the ionization current from the Helium gas is almost twice that from the Neon gas.

Keywords:

作者及机构信息

1.
上海交通大学物理系, 激光等离子体教育部重点实验室, 上海 200240;

2.
劳伦斯伯克利国家实验室, 美国加州 94720

基金项目: 国家自然科学基金(批准号: 11075105, 11121504) 资助的课题.

Authors and contacts

1.
Key Laboratory of Laser Plasma of the Education Ministry, Department of Physics, Shanghai Jiao Tong University, Shanghai 200240, China;

2.
Lawrence Berkeley National Laboratory, California 94720, USA

Funds: Project supported by the National Natural Science Foundation of China (Grant Nos. 11075105, 11121504).

参考文献

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施引文献

[1]	Ferguson B, Zhang X C 2002 Nature Mater. 1 26
[2]	Chen H T, Padilla W J, Zide J M O, Gossard A C, Taylor A J, Averitt R D 2006 Nature 444 597
[3]	Carr G L, Martin M C, McKinney W R, Jordan K, Neil G R, Williams G P 2002 Nature 420 153
[4]	Abo-Bakr M, Feikes J, Holldack K, Kuske P, Peatman W B, Schade U, Wüstefeld G 2003 Phys. Rev. Lett. 90 094801
[5]	Sung C, Tochitsky S Y, Reiche S, Rosenzweig J B, Pellegrini C, Joshi C 2006 Phys. Rev. ST Accel. Beams 9 120703
[6]	Hu M, Zhang Y X, Yan Y, Zhong R B, Liu S G 2009 Chin. Phys. B 18 3877
[7]	Liu S G, Yuan X S, Liu D W, Yan Y, Zhang Y X, Li H F, Zhong R B 2007 Phys. Plasmas 14 103114
[8]	Leemans W P, Geddes C G R, Faure J, Tóth C, Tilborg J V, Schroeder C B, Esarey E, Fubiani G, Auerbach D, Marcelis B, Carnahan M A, Kaindl R A, Byrd J, Martin M C 2003 Phys. Rev. Lett. 91 074802
[9]	Li C, Zhou M L, Ding W J, Du F, Liu F, Li Y T, Wang W M, Sheng Z M, Ma J L, Chen L M, Lu X, Dong Q L, Wang Z H, Lou Z, Shi S C, Wei Z Y, Zhang J 2011 Phys. Rev. E 84 036405
[10]	Jin Z, Chen Z L, Zhuo H B, Kon A, Nakatsutsumi M, Wang H B, Zhang B H, Gu Y Q, Wu Y C, Zhu B, Wang L, Yu M Y, Sheng Z M, Kodama R 2011 Phys. Rev. Lett. 107 265003
[11]	Wu H C, Sheng Z M, Zhang J 2008 Phys. Rev. E 77 046405
[12]	Sprangle P, Penano J R, Hafizi B, Kapetanakos C A 2004 Phys. Rev. E 69 066415
[13]	Cook D J, Hochstrasser R M 2000 Opt. Lett. 25 1210
[14]	Thomson M D, Kress M, Loeffler T, Roskos H G 2007 Laser Photon. Rev. 1 349
[15]	Zhang Y, Chen Y, Marceau C, Liu W, Sun Z D, Xu S, Théberge F, Châteauneuf M, Dubois J, Chin S L 2008 Opt. Express 16 15483
[16]	Kress M, Löffler T, Thomson M D, Dörner R, Gimpel H, Zrost K, Ergler T, Moshammer R, Morgner U, Ullrich J, Roskos H G 2006 Nat. Phys. 2 327
[17]	Kim K Y, Glownia J H, Taylor A J, Rodriguez G 2007 Opt. Express 15 4577
[18]	Wu H C, Meyer-terVehn J, Sheng Z M 2008 New J. Phys. 10 043001
[19]	Zhou Z Y, Zhang D W, Zhao Z X, Yuan J M 2009 Phys. Rev. A 79 063413
[20]	Chen M, Pukhov A, Peng X Y, Willi O 2008 Phys. Rev. E 78 046406
[21]	Penetrante B M, Bardsley J N 1991 Phys. Rev. A 43 3100
[22]	Kemp A J, Pfund R E W, Meyer-ter-Vehn J 2004 Phys. Plasmas 11 5648
[23]	Du H W, Chen M, Sheng Z M, Zhang J 2011 Laser Part. Beams 29 447
[24]	Frolov M V, Manakov N L, Sarantseva T S, Emelin M Y, Ryabikin M Y, Starace A F 2009 Phys. Rev. Lett. 102 243901
[25]	Gingras G, Tripathi A, Witzel B 2009 Phys. Rev. Lett. 103 173001
[26]	Quan W, Lin Z, Wu M, Kang H, Liu H, Liu X, Chen J, Liu J, He X T, Chen S G, Xiong H, Guo L, Xu H, Fu Y, Cheng Y, Xu Z Z 2009 Phys. Rev. Lett. 103 093001
[27]	Wang W M, Kawata S, Sheng Z M, Li Y T, Chen L M, Qian L J, Zhang J 2011 Opt. Lett. 14 2608
[28]	Sun H Q, Zhao G Z, Zhang C L, Yang G Z 2008 Acta Phys. Sin. 57 790 (in Chinese) [孙红起, 赵国忠, 张存林, 杨国桢 2008 物理学报 57 790]
[29]	Qi C C, Ouyang Z B 2011 Acta Phys. Sin. 60 090704 (in Chinese) [祁春超, 欧阳征标 2011 物理学报 60 090704]
[30]	Löffler T, Jacob F, Roskos H G 2000 Appl. Phys. Lett. 77 453
[31]	Houard A, Liu Y, Prade B, Tikhonchuk V T, Mysyrowicz A 2008 Phys. Rev. Lett. 100 255006
[32]	Sun W F, Zhou Y S, Wang X K, Zhang Y 2008 Opt. Express 16 16573
[33]	Chen Y, Wang T, Marceau C, Théberge F, Châteauneuf M, Dubois J, Kosareva O, Chin S L 2009 Appl. Phys. Lett. 95 101101
[34]	Jia W L, Shi W, Ji W L, Ma D M 2007 Acta Phys. Sin. 56 3845 (in Chinese) [贾婉丽, 施卫, 纪卫莉, 马德明 2007 物理学报 56 3845]
[35]	Wang W M, Sheng Z M, Dong X G, Du H W, Li Y T, Zhang J 2010 J. Appl. Phys. 107 023113

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