Heidelberg 1999 – scientific programme

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Q: Quantenoptik

Q 37: Poster: Quanteneffekte

Q 37.20: Poster

Thursday, March 18, 1999, 16:30–18:30, PH

Stimulated Raman Adiabatic Passage Beyond the Rotating Wave Aproximation — •R. G. Unanyan^1,2, S. Guerin^1,3, B. W. Shore^1,4, and K. Bergmann¹ — ¹Fachbereich Physik der Universit"at Kaiserslautern, Postfach 3049, D-67653 Kaiserslautern — ²Institute for Physical Research of Armenian National Academy of Sicences, Ashtarak-2, 378410, Armenia — ³Laboratoire de Physique, CNRS, Universite de Bourgogne, BP 400, 21011 Dijon, France — ⁴Lawrence Livermore National Labortory, Livermore CA 94550, USA

We present a theoretical discussion of the two-color stimulated Raman adiabatic passage (STIRAP) [1] in a three-level atomic system involving a pump and a Stokes pulse when one of the peak Rabi frequencies is larger than the difference between the two carrier frequencies. In this case we cannot assign each pulse to a unique transition as is done with the usual RWA. Unlike the usual three-state STIRAP non-negligible transient population is established in the intermediate state during the process, even for large pulse areas. This indicates that the transfer can not be described as adiabatic rotation of the dark state from initial state to the target state. We show that for large difference between carrier frequencies, this process can be treated perturbatively and the Schr"odinger equation can be solved analytically. In general case, we develop a model which takes into account the mutual interaction the large fields with both transitions by means of Floquet theory.

[1] K. Bergmann, et al., Rev. Mod. Physics, 70, 1003, (1998)