Two-photon excitation of hydrogen atom by sub-femtoseconds electromagnetic pulses

The development of methods of generation of ultrashort pulses (USP) of femto- and attosecond duration ranges with controlled parameters necessitates the theoretical study of features of their interaction with a matter. Among such features that do not exist in case of "long" pulses should f...

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Bibliographic Details
Published in2016 4th International Conference on Photonics, Optics and Laser Technology (PHOTOPTICS) pp. 1 - 4
Main Authors Astapenko, V. A., Sakhno, S. V.
Format Conference Proceeding
LanguageEnglish
Published SCITEPRESS 01.02.2016
Subjects
Atomic measurements
Corrected Gaussian Pulse
Electric fields
EMP radiation effects
Excitation
Hydrogen
Optical pulse generation
Resonant frequency
Sub-Femtoseconds Electromagnetic Pulses
Ultrashort Pulses
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Summary:The development of methods of generation of ultrashort pulses (USP) of femto- and attosecond duration ranges with controlled parameters necessitates the theoretical study of features of their interaction with a matter. Among such features that do not exist in case of "long" pulses should first of all be the nonlinear dependence of the photoprocess probability W on the USP duration as well as the dependence on the carrier phase with respect to the pulse envelope. It should be noted that if the dependence of the probability W on the phase manifests itself either only for very short pulses, when ωt <; 1 (w is carrier frequency of the pulse, t its duration), or in case of a nonlinear photoprocess, the function W(t) can differ from a linear function in the limit ωt > 1 too for fields of moderate strength, when the perturbation theory is applicable. The present work is dedicated to the theoretical analysis of two-photon excitation of hydrogen atom in a discrete energy spectrum by ultrashort electromagnetic pulses of femto- and subfemtosecond ranges of durations. As examples, excitation of hydrogen atom from the ground state to excited states with a zero orbital moment is considered.