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Q: Quantenoptik und Photonik

Q 2: Poster Quantengase

Q 2.7: Poster

Freitag, 4. März 2005, 11:00–12:30, Poster HU

Coherence in two-color photoassociation — •Klaus Winkler¹, Matthias Theis¹, Gregor Thalhammer¹, Ina B. Kinski¹, Rudolf Grimm^1,2, and Johannes Hecker Denschlag¹ — ¹Institut für Experimentalphysik, Universität Innsbruck, Austria — ²Institut für Quantenoptik und Quanteninformation, Innsbruck, Austria

Two phase locked laser beams were used in a Raman configuration to couple the atomic collisional state to a bound molecular state. The observed Autler-Townes spectra show a dramatic suppression of photoassociation losses on resonance. This is a strong signature of coherence of the atom-molecule transition. Suppression of losses was also recently observed in first measurements on thermal samples [1,2]. We find that using a BEC largely improves the visibility of this effect. As pointed out by Bergmann et al. [3] this result is relevant in connection with recent proposals [4] to use STIRAP for converting atomic BECs into molecular BECs. We estimate the feasibility of STIRAP based on our experimental data.

[1] B. Laburthe Tolra et al., Phys. Rev. A 64, 061401 (2001)

[2] U. Schlöder et al., Phys. Rev. A 68, 051403 (2003)

[3] K. Bergmann et al., Rev. Mod. Phys. 70, 1003 (1998)

[4] M. Mackie et al., Phys. Rev. A 70, 013614 (2004)