Enhanced carrier-envelope phase effect in photoexcitations of alkali atoms

Parvendra Kumar, Amarendra K. Sarma, P. Predeep +2 more

Yang, Xiaoxue, Wu +1 more

Fatima Anis, Brett D. Esry

We have conducted a detailed theoretical study of alkali atoms in ultrashort laser pulses to see carrier-envelope phase effects for photoexcitation. This effect has been noted previously by Nakajima and Watanabe (2006 Phys. Rev. Lett. 96 213001) for Cs atoms. The present study, however, includes results from Li, Na, K and Rb as well as from Cs for a range of intensities in an effort to identify a larger effect and thus enhance its chances to be seen experimentally.

David L. Moores

David A. Cardimona

Valery Alexandrovich Astapenko

Abstract The dynamics of photoexcitation of the hydrogen atom in the discrete and continuous spectra under the action of laser pulses in the attosecond range of time and pulse durations has been analyzed using perturbation theory. It is shown that over time interval shorter than or on the order of pulse duration, the time dependence of the photoexcitation probability is generally oscillating by nature. It has been established that for certain values of parameters, the envelope of this dependence has a peak, the position of which is determined by the pulse duration and carrier frequency.