Isolated attosecond pulse generation from atom radiated by a three-color laser pulse

doi:10.1088/1674-1056/23/9/093205

Abstract We theoretically investigate high-order harmonic and attosecond pulse generation from helium atom in a three-color laser field, which is synthesized by 10 fs/800 nm Ti-sapphire laser and a two-color field consisting of 30 fs/532 nm and 30 fs/1330 nm pulses. Compared with harmonic spectrum generated by a monochromatic field, the harmonics generated from the synthesized three-color field show a supercontinuum spectrum with a bandwidth of 235 eV, ranging from the 154th to the 306th order harmonic. This phenomenon can be attributed to the fact that the ionization of atoms as well as motion of ionized electron can be effectively controlled in the three-color field. Therefore, an isolated 46-as pulse can be generated by superposing supercontinuum from the 160th to the 210th order harmonics.

Keywords: three-color laser field high-order harmonic isolated attosecond pulse

Received: 06 May 2014
Revised: 02 July 2014
Accepted manuscript online:

PACS:	32.80.Rm	(Multiphoton ionization and excitation to highly excited states)
	42.50.Hz	(Strong-field excitation of optical transitions in quantum systems; multiphoton processes; dynamic Stark shift)
	42.65.Re	(Ultrafast processes; optical pulse generation and pulse compression)

Fund: Project supported by the National Basic Research Program of China (Grant No. 2013CB922200), the National Natural Science Foundation of China (Grant Nos. 11274141, 11034003, and 11204020), the Research Foundation for Basic Research of Jilin Province, China (Grant Nos. 20130101012JC and 20140101168JC), and the Research Fund for the Doctoral Program of Higher Education of China (Grant No. 20130061110021).

Corresponding Authors: Chen Gao
E-mail: chengao@cust.edu.cn

Cite this article:

Qin Yue-Fei (秦岳飞), Guo Fu-Ming (郭福明), Li Su-Yu (李苏宇), Yang Yu-Jun (杨玉军), Chen Gao (陈高) Isolated attosecond pulse generation from atom radiated by a three-color laser pulse 2014 Chin. Phys. B 23 093205

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Isolated attosecond pulse generation from atom radiated by a three-color laser pulse

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