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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.
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Keywords:
- terahertz emission /
- ionization currents /
- two-color laser pulses
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[2] Chen H T, Padilla W J, Zide J M O, Gossard A C, Taylor A J, Averitt R D 2006 Nature 444 597
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[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
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[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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[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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