Efficient generation of isolated attosecond pulses with high beam-quality by two-color Bessel-Gauss beams

摘要

The generation of isolated attosecond pulses with high efficiency and highbeam quality is essential for attosec- ond spectroscopy. We numericallyinvestigate the supercontinuum generation in a neutral rare-gas medium drivenby a two-color Bessel-Gauss beam. The results show that an efficient smoothsupercontinuum in the plateau is obtained after propagation, and the spatialprofile of the generated attosecond pulse is Gaussian-like with the divergenceangle of 0.1 degree in the far field. This bright source with high beam qualityis beneficial for detecting and controlling the microscopic processes onattosecond time scale.