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Q: Quantenoptik

Q 50: Laserspektroskopie III

Q 50.4: Vortrag

Donnerstag, 19. März 1998, 14:45–15:00, M 628

The Influence of Time Dependent Laser Light Phase and Amplitude on Resonant 3-Photon Ionization of Hydrogenic Atoms — •R. Santra¹, V. Yakhontov^1,2, V. Meyer¹, and K. Jungmann¹ — ¹Physikalisches Institut der Universit"at Heidelberg, D-69120 Heidelberg — ²St. Petersburg State Technical University, Ru-195251 St. Petersburg

The ionization probability and the line shape for the two-step 3-photon ionization process, 1S —→^{2ℏ ω}2S —→^{ℏ ω}ε P , of the ground state of hydrogenic atoms in a non-monochromatic laser field with a time–dependent amplitude has been calculated within he framework of a three–level model. The AC Stark shifts and non-zero ionization rates of all states involved were taken into account together with spatial and temporal inhomogeneities of typical laser beams. In contrast to the usual perturbative technique, the time evolution of the atomic states was simulated by direct numerically solving the system of coupled time–dependent inhomogeneous differential equations. Particular numerical results were obtained for typical parameters of the pulsed laser field that are employed in a new experiment to measure the 1S−2S energy separation in muonium at the Rutherford Appleton Laboratory. The shifts and asymmetries of the photoionization lineshapes revealed may be of relevance for ultrahigh precision experiments in hydrogen in cw laser fields.