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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 |
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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.
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Received: 29 November 2014
Revised: 24 March 2015
Published: 05 July 2015
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PACS:
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32.80.Rm
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(Multiphoton ionization and excitation to highly excited states)
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42.65.Ky
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(Frequency conversion; harmonic generation, including higher-order harmonic generation)
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42.65.Re
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(Ultrafast processes; optical pulse generation and pulse compression)
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| 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
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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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