Quantum path control and isolated attosecond pulse generation in the combination of near-infrared and terahertz pulses

doi:10.1088/1674-1056/24/7/073202

Abstract

We present an efficient and realizable scheme for the generation of an ultrashort single attosecond (as) pulse from H atom with a 800-nm fundamental laser field combined with a terahertz (THz) field. The high-order harmonic generation (HHG) can be obtained by solving the time-dependent Schrödinger equation accurately and efficiently with time-dependent generalized pseudo-spectral (TDGPS) method. The result shows that the plateau of high-order harmonics is extended and the broadband spectra can be produced by the combined laser pulse, which can be explained by the corresponding ionization probability. The time–frequency analysis and semi-classical three-step model are also presented to further investigate this mechanism. Besides, by the superposition of the harmonics near the cutoff region, an isolated 133-as pulse can be obtained.

Keywords: high-order harmonic generation generalized pseudospectral method attosecond pulse

Received: 29 November 2014
Revised: 24 March 2015
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. 11174108, 11104108, and 11271158).

Corresponding Authors: Guo Jing, Liu Xue-Shen
E-mail: gjing@jlu.edu.cn;liuxs@jlu.edu.cn

Cite this article:

Zhong Hui-Ying (钟慧英), Guo Jing (郭静), Zhang Hong-Dan (张宏丹), Du Hui (杜慧), Liu Xue-Shen (刘学深) Quantum path control and isolated attosecond pulse generation in the combination of near-infrared and terahertz pulses 2015 Chin. Phys. B 24 073202

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