| ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS |
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Harmonic and attosecond pulse enhancement in the presence of noise |
| Feng Li-Qiang (冯立强)a, Chu Tian-Shu (楚天舒)a b |
a State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China;
b Institute for Computational Sciences and Engineering, Laboratory of New Fiber Materials and Modern Textile, the Growing Base for State Key Laboratory, Qingdao University, Qingdao 266071, China |
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Abstract In this paper, we theoretically investigate the effect of noise on the photoionization, the generations of the high-order harmonic and the attosecond pulse irradiated from a model He+ ion. It shows that by properly adding the noise fields, such as the Gaussian white noise, the random light or the colour noise, both the ionization probabilities (IPs) and the harmonic yields can be enhanced by several orders of magnitude. Further, by tuning the noise intensity, a stochastic resonancelike curve is observed, showing the existence of an optimal noise in the ionization enhancement process. Finally, by superposing a properly selected harmonic, an intense attosecond pulse with a duration of 67 as is directly generated.
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Received: 13 April 2012
Revised: 08 May 2012
Accepted manuscript online:
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PACS:
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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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32.80.Fb
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(Photoionization of atoms and ions)
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| Fund: Project supported by the National Natural Science Foundations of China (Grant Nos. 10874096 and 20633070). |
Corresponding Authors:
Chu Tian-Shu
E-mail: tschu@dicp.ac.cn;tschu008@163.com
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Cite this article:
Feng Li-Qiang (冯立强), Chu Tian-Shu (楚天舒) Harmonic and attosecond pulse enhancement in the presence of noise 2012 Chin. Phys. B 21 124204
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