Berlin 2005 – wissenschaftliches Programm
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Q: Quantenoptik und Photonik
Q 20: Poster Fallen & Kühlung
Q 20.5: Poster
Montag, 7. März 2005, 11:00–12:30, Poster HU
Experimental observation of transient velocity-selective coherent population trapping in one dimension — •Frank Vewinger, Frank Zimmer, Klaas Bergmann, and Michael Fleischhauer — Fachbereich Physik, TU Kaiserslautern
We report the observation of transient velocity-selective coherent population trapping (VSCPT)[1] in a beam of metastable neon atoms. The atomic momentum distribution resulting from the interaction with counterpropagating σ+ and σ− radiation coupling a Jg=2↔ Je=1 transition is measured via the transversal beam profile. This transition exhibits a stable VSCPT dark state between the |J=2,m=±1> states, and a metastable dark state containing the |J=2,m=± 2> and |J=2,m=0> state[2]. The decay of the latter dark state is experimentally observed and its metastability is directly shown by control of the interaction time. We analyze the population dynamics by solving the generalized optical Bloch equations numerically and compare it with the measured distribution.
[1] A. Aspect et al. PRL 61:826 (1988)
[2] F. Papoff et al. JOSA B 9:321 (1992)