High-order harmonic generation with a two-color laser pulse

doi:10.1088/1674-1056/21/3/033202

Abstract We theoretically investigate the electron dynamics of the high-order harmonics generation process by combining a near-infrared 800 nm driving pulse with a mid-infrared 2000 nm control field. We also investigate the emission time of harmonics using time-frequency analysis to illustrate the physical mechanisms of high-order harmonic generation. We calculate the ionization rate using the Ammosov-Delone-Krainov model and interpret the variations in harmonic intensity for different control field strengths and delays. We find that the width of the harmonic plateau can be extended when the control electric field is added, and a supercontinuum from 198 to 435 eV is generated, from which an isolated 61-as pulse can be directly obtained.

Keywords: high-order harmonic generation attosecond pulse

Received: 17 May 2011
Revised: 23 July 2011
Accepted manuscript online:

PACS:	32.80.Rm	(Multiphoton ionization and excitation to highly excited states)
	42.65.Ky	(Frequency conversion; harmonic generation, including higher-order harmonic generation)
	42.65.Re	(Ultrafast processes; optical pulse generation and pulse compression)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11075069, 91026021, and 11075068), the Fundamental Research Funds for the Central Universities, China (Grant No. lzujbky-2010-k08), and the Scholarship Award for Excellent Doctoral Student granted by the Ministry of Education, China.

Corresponding Authors: Hu Bi-Tao,hubt@lzu.edu.cn
E-mail: hubt@lzu.edu.cn

Cite this article:

Luo Lao-Yong(罗老永), Du Hong-Chuan(杜洪川), and Hu Bi-Tao(胡碧涛) High-order harmonic generation with a two-color laser pulse 2012 Chin. Phys. B 21 033202

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