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Time-energy properties of an attosecond extreme ultra-violet pulse |
| Ge Yu-Cheng(葛愉成)†ger and He Hai-Ping(何海萍) |
| School of Physics and Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China |
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Abstract The time-energy properties of high-order harmonic generation (HHG) are calculated for a linearly polarized 7-fs laser pulse with different carrier-envelope phases (CEPs). The quantum trajectory paths that contribute to an as (1 as=10-18 s) pulse in HHG are identified. The laser-duration dependence and the CEP dependence of HHG energy property are investigated. The study shows that an as extreme ultra-violet (XUV) pulse can be selected from HHG spectrum near cut-off energy with a bandpass optical filter. The theoretical prediction of the pulse duration is proportional to bandwidth. Analysis suggests that a measured narrowband as XUV pulse may consist of instantaneous shorter pulses each dependent on laser pulse duration, intensity, and CEP. These information can be used as references for producing, selecting, improving and manipulating (timing) as pulses.
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Received: 29 April 2010
Revised: 13 July 2010
Accepted manuscript online:
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PACS:
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32.80.Fb
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(Photoionization of atoms and ions)
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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. 10827505 and 10675014). |
Cite this article:
Ge Yu-Cheng(葛愉成) and He Hai-Ping(何海萍) Time-energy properties of an attosecond extreme ultra-violet pulse 2010 Chin. Phys. B 19 103302
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