Abstract
Angle-resolved photoelectron spectra of argon atoms by XUV attosecond pulses in the presence of a circularly polarized laser field are calculated to examine their dependence on the duration and the chirp of the attosecond pulses. From the calculated electron spectra, we show how to retrieve the duration and the chirp of the attosecond pulse using genetic algorithm. The method is expected to be used for characterizing the attosecond pulses which are produced by polarization gating of few-cycle left- and right-circularly polarized infrared laser pulses.
Highlights
Single attosecond extreme ultraviolet (XUV) or soft x-ray pulses can be generated by highorder harmonic generation with few-cycle femtosecond infrared (IR) laser pulses [1]
Due to their short wavelength and weak intensity, conventional autocorrelation method cannot be used to determine their pulse durations directly. It has relied on the method of laser-assisted photoionization where photoelectron spectra by XUV pulses are measured in the field of the IR lasers
We examined first theoretically how the electron spectra, including the angular distributions, depend on the pulse duration and the chirp parameter of the XUV light pulse
Summary
Single attosecond extreme ultraviolet (XUV) or soft x-ray pulses can be generated by highorder harmonic generation with few-cycle femtosecond infrared (IR) laser pulses [1] Due to their short wavelength and weak intensity, conventional autocorrelation method cannot be used to determine their pulse durations directly. Based on the quantum mechanical formulation of laser-dressed photoionization [4, 5], experimental measurements of photoelectron spectra have been performed and pulse duration of a few hundreds of attoseconds [2] has been determined Most recently, such technique has been used to characterize the electric field of a few-cycle laser pulse directly [6]. The atomic structure parameters from these calculations will be used in Section 3 to generate ”theoretical” photoionization electron spectra by attosecond pulses in the presence of circularly polarized lasers. Atomic units will be used throughout in this paper unless otherwise indicated
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