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We theoretically study the high-order harmonic generation (HHG) of a model He atom exposed to a combined field of 1600 nm and 800 nm laser pulses. The changing of rising rate and falling rate with time for the combined filed during main HHG, can present the different characteristics of high-order harmonic generation from the short electron trajectories and the long electron trajectories. By superimposing several harmonics generated from He atom driven by the combined field, we could obtain shorter attosecond pulses. Finally, by adjusting the time delay between two laser pulses, we can effectively suppress the contribution of the short electron trajectories to HHG, and obtain an isolated attosecond pulse with duration 33.7 as.
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Keywords:
- combined field /
- high-order harmonic generation /
- attosecond pulse
[1] Krausz F, Ivanov M 2009 Rev. Mod. Phys. 81 163
[2] Winterfeldt C, Spielmann C, Gerber G 2008 Rev. Mod. Phys. 80 117
[3] Corkum P B 1993 Phys. Rev. Lett. 71 1994
[4] Paul P M, Toma E S, Breger P 2001 Science 292 1689
[5] Mairesse Y, DeBohan A, Frasinski L J 2003 Science 302 1540
[6] Sansone G, Benedetti E, Calegari F 2006 Science 314 443
[7] Du H C, Wang H Q, Hu B T 2010 Phys. Rev. A 81 063813
[8] Chen J G, Zeng S L, Yang Y J 2010 Phys. Rev. A 82 043401
[9] Xia C L, Liu X S 2012 Acta Phys. Sin. 61 043303 (in Chinese) [夏昌龙, 刘学深 2012 61 043303]
[10] Hong W Y, Yang Z Y, Lan P F, Zhang Q B, Li Q G, Lu P X 2009 Acta Phys. Sin. 58 4914 (in Chinese) [洪伟毅, 杨振宇, 兰鹏飞, 张庆斌, 李钱光, 陆培祥 2009 58 4914]
[11] Lu R F, He H X, Guo Y H 2009 J. Phys. B 42 22560
[12] Orlando G, Corso P P, Fiordilino E 2009 J. Mod. Opt. 56 1761
[13] Li P C, Zhou X X, Wang G L, Zhao Z X 2009 Phys. Rev. A 80 053825
[14] Xiang Y, Niu Y P, Gong S Q 2009 Phys. Rev. A 79 053419
[15] 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 60 033202]
[16] Pan H L, Wang G L, Zhou X X 2011 Chinese Sci. Bull. 56 2561 (in Chinese) [潘慧玲, 王国利, 周效信 2011 科学通报 56 2561]
[17] Liu I L, Li P C, Chu S I 2011 Phys. Rev. A 84 033414
[18] Li P C, Zhou X X, Dong C Z, Zhao S F 2004 Acta Phys. Sin. 53 750 (in Chinese) [李鹏程, 周效信, 董晨钟, 赵松峰 2004 53 750]
[19] Burnett K, Reed V C, Cooper J, Knight P L 1992 Phys. Rev. A 45 3347
[20] Antoine P, Piraux B, Maquet A 1995 Phys. Rev. A 51 R1750
[21] Pérez-Hernández J A, Hoffmann D J 2009 J. Phys. B 42 134004
[22] Ye X L, Zhou X X, Zhao S F, Li P C 2009 Acta Phys. Sin. 58 1579 (in Chinese) [叶小亮, 周效信, 赵松峰, 李鹏程 2009 58 1579]
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[1] Krausz F, Ivanov M 2009 Rev. Mod. Phys. 81 163
[2] Winterfeldt C, Spielmann C, Gerber G 2008 Rev. Mod. Phys. 80 117
[3] Corkum P B 1993 Phys. Rev. Lett. 71 1994
[4] Paul P M, Toma E S, Breger P 2001 Science 292 1689
[5] Mairesse Y, DeBohan A, Frasinski L J 2003 Science 302 1540
[6] Sansone G, Benedetti E, Calegari F 2006 Science 314 443
[7] Du H C, Wang H Q, Hu B T 2010 Phys. Rev. A 81 063813
[8] Chen J G, Zeng S L, Yang Y J 2010 Phys. Rev. A 82 043401
[9] Xia C L, Liu X S 2012 Acta Phys. Sin. 61 043303 (in Chinese) [夏昌龙, 刘学深 2012 61 043303]
[10] Hong W Y, Yang Z Y, Lan P F, Zhang Q B, Li Q G, Lu P X 2009 Acta Phys. Sin. 58 4914 (in Chinese) [洪伟毅, 杨振宇, 兰鹏飞, 张庆斌, 李钱光, 陆培祥 2009 58 4914]
[11] Lu R F, He H X, Guo Y H 2009 J. Phys. B 42 22560
[12] Orlando G, Corso P P, Fiordilino E 2009 J. Mod. Opt. 56 1761
[13] Li P C, Zhou X X, Wang G L, Zhao Z X 2009 Phys. Rev. A 80 053825
[14] Xiang Y, Niu Y P, Gong S Q 2009 Phys. Rev. A 79 053419
[15] 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 60 033202]
[16] Pan H L, Wang G L, Zhou X X 2011 Chinese Sci. Bull. 56 2561 (in Chinese) [潘慧玲, 王国利, 周效信 2011 科学通报 56 2561]
[17] Liu I L, Li P C, Chu S I 2011 Phys. Rev. A 84 033414
[18] Li P C, Zhou X X, Dong C Z, Zhao S F 2004 Acta Phys. Sin. 53 750 (in Chinese) [李鹏程, 周效信, 董晨钟, 赵松峰 2004 53 750]
[19] Burnett K, Reed V C, Cooper J, Knight P L 1992 Phys. Rev. A 45 3347
[20] Antoine P, Piraux B, Maquet A 1995 Phys. Rev. A 51 R1750
[21] Pérez-Hernández J A, Hoffmann D J 2009 J. Phys. B 42 134004
[22] Ye X L, Zhou X X, Zhao S F, Li P C 2009 Acta Phys. Sin. 58 1579 (in Chinese) [叶小亮, 周效信, 赵松峰, 李鹏程 2009 58 1579]
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