Hannover 2013 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 56: Poster III

Q 56.1: Poster

Donnerstag, 21. März 2013, 16:00–18:30, Empore Lichthof

Development of a laser system for coupling quantum gases with optical cavities — •Moonjoo Lee, Julian Leonard, Leigh Martin, Christian Zosel, Tilman Esslinger, and Tobias Donner — Institute for Quantum Electronics, ETH Zürich

Quantum gases coupled with high-finesse optical cavities opened a new way in exploring quantum many-body systems with long-range interactions. Extreme coupling rates on the order of GHz are achievable in these systems, but demand for lasers sources with wide range tunability while having very narrow linewidths.

We employ two diode lasers, one of them to probe/pump the system at 780 nm and the other to lock cavities at 830 nm. The absolute frequency of the probe laser is offset locked onto a frequency comb. Frequency stabilization to linewidths below 50 kHz is achieved by locking both lasers onto a transfer cavity. The frequency of the stabilized lasers are tunable by several GHz via wideband electro-optic modulators and one sideband is filtered out by using a cleaning cavity.

We are also presenting our progress in fabricating crossed high-finesse cavities which offer possibilities for nondestructive probing of quantum phases and for the realization of the multimode Dicke Hamiltonian.