Extension of high-order harmonics and generation of an isolated attosecond pulse in the chirped laser field |
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Authors: | Wu Jie Zhai Zhen and Liu Xue-Shen |
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Abstract: | This paper theoretically investigates the high-order harmonic generation cutoff extension using intense few-cycle linearly chirped laser pulses. It shows that the cutoff of the harmonic can be extended remarkably by optimising the chirping parameters. The time-frequency characteristics of high-order harmonics with different chirping parameters are analysed by means of wavelet transform of the dipole acceleration. It also gives out the classical three-step model pictures of electron. By superposing a properly selected range of the harmonic spectrum, it obtains an isolated 65as pulse. |
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Keywords: | high-order harmonic generation isolated attosecond pulse chirped laser field |
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