Abstract

Combining the one dimensional propagation equation and the wavelet transform of dipole moment of atoms in intense laser field, the spectrum of high-order harmonics generated and propagated in ionizing noble gas has been analyzed. The results show that, the spectral lines of harmonic become broad and then split into peaks when the laser intensity is strong enough to ionize the noble gas, and the harmonic emission therefore become quasi-continuum in the higher order region.

© 2001 IEEE