Open AccessEffects of additional pulse wavelength at different frequencies on attosecond pulse generation in multicycle two-color laser field
Author(s) -
Meng Jian,
Chunqing Gao,
Sheng-Nan Liu
Publication year - 2012
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.61.203202
Subject(s) - supercontinuum , optics , physics , ultrashort pulse , bandwidth limited pulse , pulse (music) , multiphoton intrapulse interference phase scan , attosecond , laser , femtosecond pulse shaping , high harmonic generation , wavelength , harmonic spectrum , ultrafast laser spectroscopy , detector , photonic crystal fiber
We theoretically investigate the effects of additional pulse wavelength at different frequencies on attosecond pulse generation from the hydrogen atom exposed to multicycle two-color laser field, by numerically solving the one-dimensional time-dependent Schrödinger equation. The results show that when the wavelength of the additional pulse is set to be 1600 nm, the cutoff position of the harmonic spectra is extended dramatically compared with the scenario in the case of 533 nm pulse in visible waveband, accordingly the bandwidth of supercontinuum is widened, finally 78 attosecond pulse is obtained by wavelet transform. In this paper, we explain the effects of additional pulse wavelength in different wavebands on high order harmonic generation for the first time according to the optical oscillation frequency of the synthesized field. Also, such a result is conducible to choosing the appropriate additional pulse frequency in order to obtain the isolated attosecond pulse.