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Chin. Phys. B, 2015, Vol. 24(7): 073202    DOI: 10.1088/1674-1056/24/7/073202
ATOMIC AND MOLECULAR PHYSICS Prev   Next  

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

Zhong Hui-Ying, Guo Jing, Zhang Hong-Dan, Du Hui, Liu Xue-Shen
Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, China
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      Published:  05 July 2015
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, Guo Jing, Zhang Hong-Dan, Du Hui, Liu Xue-Shen 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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