Carrier–envelope phase dependence of a half-cycle soliton generation in asymmetric media

Abstract

We investigate the carrier–envelope phase dependence of the unipolar half-cycle soliton pulse generation when few-cycle ultrashort laser pulses propagate in resonant asymmetric media. It is found that the half-cycle soliton pulse generation depends on both the permanent dipole moment and the electric field shape of the incident few-cycle ultrashort pulse. The irradiation of low-frequency electromagnetic waves superposes with the incident few-cycle ultrashort pulse, which leads to the generation of half-cycle solitons in quantum systems with broken inversion symmetry. Since the electric field shape of the incident few-cycle ultrashort laser pulse depends sensitively on the carrier–envelope phase, the generated half-cycle solitons depend on the carrier–envelope phase of the incident pulse.