Generation of isolated attosecond pulses by two-color laser fields
We consider high-harmonic generation in hydrogen atoms exposed to a superposition of two lin- early polarized laser fields with different colors. To this end, the full three-dimensional Schrödinger equation for the hydrogen atom is solved numerically to obtain the single-atom response. Phase-matching effects are subsequently taken into account in the limit of small atomic density. Our findings clearly indicate the possibility of creating isolated attosecond pulses from many-cycle ( ΔτFWHM = 19 fs) driver pulses by an appropriate tuning of the two laser frequencies, which results in control of the ionization and the recollision dynamics of the electronic wavepacket.
Siedschlag, Ch, Muller, H. G, & Vrakking, M. J. J. (2005). Generation of isolated attosecond pulses by two-color laser fields. Laser Phys., 15(6), 916–925.