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Q: Fachverband Quantenoptik und Photonik
Q 21: Poster I
Q 21.31: Poster
Dienstag, 9. März 2010, 16:00–19:00, Lichthof
Laser stabilisation for the production of rovibronic ground-state molecules — •Raffael Rameshan1, Almar Lercher1, Markus Debatin1, Bastian Schuster1, David Baier1, Francesca Ferlaino1, Tetsu Takekoshi1, Grimm Rudolf1,2, and Hanns-Christoph Nägerl1 — 1Institut für Experimentalphysik, Universität Innsbruck — 2IQOQI Innsbruck
Samples of polar ground-state molecules in the quantum-gas regime offer intriguing prospects for the investigation of novel physical phenomena. We aim to produce a gas of RbCs ground-state molecules near quantum degeneracy by first associating atoms to weakly bound molecules on a Feshbach resonance. Subsequently, the molecules are coherently transferred to the rovibrational ground state of the ground electronic potential by two-photon Stimulated Raman Adiabatic Passage (STIRAP). The STIRAP lasers have to be phase-coherent on the timescale of the transfer process. Ultra-narrow-linewidth lasers enable long STIRAP transfer times and consequently optimized adiabaticity. In addition, long STIRAP times avoid Fourier broadening of the STIRAP resonance and hence allow frequency-selective addressing of individual hyperfine levels of the ground-state molecules. We plan to construct a Raman laser system with sub-Hertz relative linewidth by locking two grating-stabilised diode lasers to ultra-high finesse optical resonators(1). To suppress fast phase fluctuations, the lasers will feature a long external resonator design (2).
(1) M. Notcutt et al.; Optics Letters 30, 1815-1817 (2005) (2) J. Alnis et al.; Eur. Phys. J. Special Topics 163, 89-94 (2008)