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采用多周期的800 nm钛宝石激光组合1600 nm中红外脉 冲辐照氦离子产生高次谐波发射功率谱. 相对于单色场情形, 谐波谱出现明显的双平台结构, 且在第二平台区出现了光滑的连续辐射谱, 其转化效率相对于第一平台低了约两个数量级. 通过附加脉宽为1 fs的27次谐波脉冲到双色激光场的特定时域, 可以控制电子电离在半个光学周期内迅速提升, 获得了由单一短量子路径贡献的连续辐射谱, 使得第二平台区谐波的转化效率相对于组合场情形增强4个数量级, 且连续谱的频谱范围从第二平台区扩展到第一平台区, 叠加该连续谱190次到285次谐波生成了脉宽为29 as的强、短孤立脉冲.We theoretically investigate the high-order harmonic generation from He+in the two-color laser pulse, which is composed of a multi-cycle 800 nm laser and 1600 nm laser. Compared with the case of the fundamental laser, the harmonic spectrum presents a two-plateau structure, and a broadband supercontinuum appears in the second plateau, of which the efficiency is approximately 2 orders of magnitude lower than that of the first plateau. Adding the 27th harmonic pulse to the two-color laser at a proper time, we can control the ionization mostly occurring at half the optical cycle, and the short quantum path can be picked out, the second plateau is heightened four orders of magnitude compared with the case of the two-color case. Furthermore, the supercontinuum spectrum is extended from the second plateau to the first one. An intense isolated pulse with a duration of 29 as is obtained by superposing the 190th285th harmonics in the continuous region.
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Keywords:
- combined laser pulse /
- harmonic pulse /
- attosecond pulse
[1] Sansone G, Benedetti E, Calegari F, Vozzi C, Avaldi L, Flammini R, Poletto L, Villoresi P, Altucci C, Velotta R, Stagira S, Silvestri S De, Nisoli M 2006 Science 314 443
[2] Corkum P B, Krausz F 2007 Nature 3 381
[3] Krausz F, Ivanov M 2009 Rev. Mod. Phys. 81 163
[4] Corkum P B 1993 Phys. Rev. Lett. 71 1994
[5] Kienberger R, Goulielmakis E, Uiberacker M, Baltuska A, Yakovlev V, Bammer F, Scrinzi A, Westerwalbesloh Th, Kleineberg U, Heinzmann U, Drescher M, Krausz F 2004 Nature 427 817
[6] Zeng Z, Cheng Y, Song X, Li R, Xu Z 2007 Phys. Rev. Lett. 98 203901
[7] Zhang G T, Liu X S 2009 J. Phys. B 42 125603
[8] Zhao S F, Zhou X X, Li P C, Chen Z 2008 Phys. Rev. A 78 063404
[9] Hong W, Lu P, Lan P, Yang Z, Li Y, Liao Q 2008 Phys. Rev. A 77 033410
[10] Zhai Z, Yu R F, Liu X S, Yang Y J 2008 Phys. Rev. A 78 041402 (R)
[11] Chen J G, Yang Y J, Zeng S L, Liang H Q 2011Phys. Rev. A 83 023401
[12] Chen J G, Zeng S L, Yang Y J 2010 Phys. Rev. A 82 043401
[13] Feng X M, Gilbertson S, Mashiko H, Wang H, Khan S D, Chini M, Wu Y, Zhao K, Chang Z 2009 Phys. Rev. Lett. 103 183901
[14] Zhang G T, Wu J, Xia C L, Liu X S 2009 Phys. Rev. A 80 055404
[15] Du H C, Wang H Q, Hu B T 2010 Phys. Rev. A 81 063813
[16] Chen J G, Yang Y J, Yu X P, He L J, Xu Y Y 2011 Acta Phys. Sin. 60 053206 (in Chinese) [陈基根, 杨玉军, 俞旭萍, 何龙君, 徐圆圆 2011 物理学报 60 053206]
[17] Chen J G, Chen G, Chi F P, Yang Y J 2010 Acta Phys. Sin. 59 0236 (in Chinese) [陈基根, 陈高, 池方萍, 杨玉军 2010 物理学报 59 0236]
[18] Li H S, Li P C, Zhou X X 2009 Acta Phys. Sin. 58 7633 (in Chinese) [李会山, 李鹏程, 周效信 2009 物理学报 58 7633]
[19] Cheng D, Yu B H, Tang Q B 2010 Acta Phys. Sin. 59 4564 (in Chinese) [陈东、余本海、汤清彬 2010 物理学报 59 4564]
[20] Zeng S L, Zou S Y, Yan J 2009 Chin. Phys. Lett. 26 053202
[21] Chen J G, Yang Y J, Chen Y 2011 Acta Phys. Sin. 60 033202 (in Chinese) [陈基根, 杨玉军, 陈漾 2011 物理学报 60 033202]
[22] Vozzi C, Calegari F, Benedetti E, Gasilov G, Cerullo G, Nisoli M, Silvestri S De, Stagira S 2007 Opt. Lett. 32 2957
[23] Ammosov M V, Delone N B, Krainov V P 1986 Sov. Phys. JETP 64 1191
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[1] Sansone G, Benedetti E, Calegari F, Vozzi C, Avaldi L, Flammini R, Poletto L, Villoresi P, Altucci C, Velotta R, Stagira S, Silvestri S De, Nisoli M 2006 Science 314 443
[2] Corkum P B, Krausz F 2007 Nature 3 381
[3] Krausz F, Ivanov M 2009 Rev. Mod. Phys. 81 163
[4] Corkum P B 1993 Phys. Rev. Lett. 71 1994
[5] Kienberger R, Goulielmakis E, Uiberacker M, Baltuska A, Yakovlev V, Bammer F, Scrinzi A, Westerwalbesloh Th, Kleineberg U, Heinzmann U, Drescher M, Krausz F 2004 Nature 427 817
[6] Zeng Z, Cheng Y, Song X, Li R, Xu Z 2007 Phys. Rev. Lett. 98 203901
[7] Zhang G T, Liu X S 2009 J. Phys. B 42 125603
[8] Zhao S F, Zhou X X, Li P C, Chen Z 2008 Phys. Rev. A 78 063404
[9] Hong W, Lu P, Lan P, Yang Z, Li Y, Liao Q 2008 Phys. Rev. A 77 033410
[10] Zhai Z, Yu R F, Liu X S, Yang Y J 2008 Phys. Rev. A 78 041402 (R)
[11] Chen J G, Yang Y J, Zeng S L, Liang H Q 2011Phys. Rev. A 83 023401
[12] Chen J G, Zeng S L, Yang Y J 2010 Phys. Rev. A 82 043401
[13] Feng X M, Gilbertson S, Mashiko H, Wang H, Khan S D, Chini M, Wu Y, Zhao K, Chang Z 2009 Phys. Rev. Lett. 103 183901
[14] Zhang G T, Wu J, Xia C L, Liu X S 2009 Phys. Rev. A 80 055404
[15] Du H C, Wang H Q, Hu B T 2010 Phys. Rev. A 81 063813
[16] Chen J G, Yang Y J, Yu X P, He L J, Xu Y Y 2011 Acta Phys. Sin. 60 053206 (in Chinese) [陈基根, 杨玉军, 俞旭萍, 何龙君, 徐圆圆 2011 物理学报 60 053206]
[17] Chen J G, Chen G, Chi F P, Yang Y J 2010 Acta Phys. Sin. 59 0236 (in Chinese) [陈基根, 陈高, 池方萍, 杨玉军 2010 物理学报 59 0236]
[18] Li H S, Li P C, Zhou X X 2009 Acta Phys. Sin. 58 7633 (in Chinese) [李会山, 李鹏程, 周效信 2009 物理学报 58 7633]
[19] Cheng D, Yu B H, Tang Q B 2010 Acta Phys. Sin. 59 4564 (in Chinese) [陈东、余本海、汤清彬 2010 物理学报 59 4564]
[20] Zeng S L, Zou S Y, Yan J 2009 Chin. Phys. Lett. 26 053202
[21] Chen J G, Yang Y J, Chen Y 2011 Acta Phys. Sin. 60 033202 (in Chinese) [陈基根, 杨玉军, 陈漾 2011 物理学报 60 033202]
[22] Vozzi C, Calegari F, Benedetti E, Gasilov G, Cerullo G, Nisoli M, Silvestri S De, Stagira S 2007 Opt. Lett. 32 2957
[23] Ammosov M V, Delone N B, Krainov V P 1986 Sov. Phys. JETP 64 1191
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