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Based on a theoretical model and numerical simulations, the ionization currents and subsequent terahertz (THz) emission induced by the interaction of a few-cycle laser pulses with He gas targets are studied. It is shown that owing to the large transverse current generated by field ionization with few-cycle laser pulses, strong THz emission can be generated. The change of the carrier phase of the few-cycle laser pulses leads to the variation of the ionization currents. Correspondingly, the THz emission amplitude shows the characteristic as a periodic function of the carrier phase, which is also confirmed by one-dimensional particle-in-cell simulations. For a given carrier phase, the THz emission amplitude is not proportional to the laser amplitude. It shows at least two peaks at certain laser amplitudes. When the gas density profile is not uniform, the emission amplitude has a similar dependence on laser amplitude and carrier envelope phase, but the THz pulse duration and spectrum are quite different.
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Keywords:
- ionization current /
- THz emission /
- particle-in-cell simulation
[1] Hamster H, Sullivan A, Gordon A 1993 Phys. Rev. Lett. 71 2725
[2] Cook D J, Hochstrasser R M 2000 Opt. Lett. 25 1210
[3] Bartel T, Gaal P, Reimann K, Woerner M, Elasesser T 2005 Opt. Lett. 30 2805
[4] Amico C D, Houard A, Franco M, Prade B, Mysyrowicz A 2007 Phys. Rev. Lett. 98 235002
[5] Kress M, Loffler T, Eden S, Thomson M, Roskos H 2005 Opt. Lett. 29 1120
[6] Wang W M, Sheng Z M, Wu H C, Chen M, Li C, Zhang J, Mima K 2008 Opt. Express 16 16999
[7] Hu Q L, Liu S B, Li W 2008 Chin. Phys. B 17 1050
[8] Houard A, Liu Y, Prade A, Mysyrowicz A 2008 Opt. Lett. 33 1195
[9] Xie X, Dai J M, Zhang X C 2008 Phys. Rev. Lett. 96 075005
[10] Wu H C, Meyer-ter-Vehn J, Sheng Z M 2008 New J. Phys. 10 043001
[11] Kim K, Glownia J, Taylor A G, Rodriguez 2007 Opt. Express 16 4577
[12] Chen M, Pukhov A, Peng X Y, Willi O 2008 Phys. Rev. E 78 046406
[13] Du H W, Chen M, Sheng Z M, Zhang J 2011 Laser Part. Beams 29 447
[14] Chen M, Sheng Z M, Zhang J 2006 Acta Phys. Sin. 55 0337 (in Chinese) [陈民, 盛政明, 张杰 2006 55 0337]
[15] Penetrante B, Bardsley J 1991 Phys. Rev. E 43 3100
[16] Walsh T, Ilkov F, Decker J, Chin S L 1994 J. Phys. B: At. Mol. Phys. 27 3767
[17] Augst S, Strickland D, Meyerhofer D, Chen S L, Eberly J 1989 Phys. Rev. Lett. 63 2212
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[1] Hamster H, Sullivan A, Gordon A 1993 Phys. Rev. Lett. 71 2725
[2] Cook D J, Hochstrasser R M 2000 Opt. Lett. 25 1210
[3] Bartel T, Gaal P, Reimann K, Woerner M, Elasesser T 2005 Opt. Lett. 30 2805
[4] Amico C D, Houard A, Franco M, Prade B, Mysyrowicz A 2007 Phys. Rev. Lett. 98 235002
[5] Kress M, Loffler T, Eden S, Thomson M, Roskos H 2005 Opt. Lett. 29 1120
[6] Wang W M, Sheng Z M, Wu H C, Chen M, Li C, Zhang J, Mima K 2008 Opt. Express 16 16999
[7] Hu Q L, Liu S B, Li W 2008 Chin. Phys. B 17 1050
[8] Houard A, Liu Y, Prade A, Mysyrowicz A 2008 Opt. Lett. 33 1195
[9] Xie X, Dai J M, Zhang X C 2008 Phys. Rev. Lett. 96 075005
[10] Wu H C, Meyer-ter-Vehn J, Sheng Z M 2008 New J. Phys. 10 043001
[11] Kim K, Glownia J, Taylor A G, Rodriguez 2007 Opt. Express 16 4577
[12] Chen M, Pukhov A, Peng X Y, Willi O 2008 Phys. Rev. E 78 046406
[13] Du H W, Chen M, Sheng Z M, Zhang J 2011 Laser Part. Beams 29 447
[14] Chen M, Sheng Z M, Zhang J 2006 Acta Phys. Sin. 55 0337 (in Chinese) [陈民, 盛政明, 张杰 2006 55 0337]
[15] Penetrante B, Bardsley J 1991 Phys. Rev. E 43 3100
[16] Walsh T, Ilkov F, Decker J, Chin S L 1994 J. Phys. B: At. Mol. Phys. 27 3767
[17] Augst S, Strickland D, Meyerhofer D, Chen S L, Eberly J 1989 Phys. Rev. Lett. 63 2212
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