Measuring the electric field of few-cycle laser pulses by attosecond cross correlation.
A new technique for directly measuring the electric field of linearly polarized few-cycle laser pulses is proposed. Based on the solution of the time-dependent Schrödinger equation (TDSE) for an H atom in the combined field of infrared (IR) femtosecond (fs) and ultraviolet (UV) attosecond (as) laser pulses we show that, as a function of the time delay between two pulses, the difference (or equivalently, asymmetry) of photoelectron signals in opposite directions (along the polarization vector of laser pulses) reproduces very well the profile of the electric field (or vector potential) in the IR pulse. Such ionization asymmetry can be used for directly measuring the carrier-envelope phase difference (i.e., the relative phase of the carrier frequency with respect to the pulse envelope) of the IR fs laser pulse.
Bandrauk
Andre D
AD
Laboratoire de Chimie Theorique, Faculte des Sciences, Université de Sherbrooke, Quebec, J1K 2R1, Canada. andrea.bandrauk@usherbrooke.ca
Chelkowski
Szczepan
S
Shon
Nguyen Hong
NH