Hannover 2013 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 56: Poster III

Q 56.64: Poster

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

Phase-Locked Raman Laser Systems Based on Interference Filter ECDLs for Coherent Hyperfine State Manipulation — •Jan Phieler, Michael Bauer, Shrabana Chakrabarti, Philipp Franzreb, Benjamin Gänger, Farina Kindermann, and Artur Widera — Technische Universität Kaiserslautern, FB Physik, Erwin-Schrödinger-Str. 46, 67663 Kaiserslautern, Germany

We report on the construction of phase-locked Raman laser systems for Rb and Cs atoms in a two-species cold atom experiment in order to enable resolved sideband cooling of tightly bound atoms to the quantum mechanical ground state of optical dipole traps as well as controlled preparation of different hyperfine states.

Interference filter stabilized extended cavity diode lasers at wavelengths of 780 and 852 nm form the laser sources of both systems and provide superior stability and narrow linewidth. Driving coherent Raman transitions between the hyperfine substates of the Rb and Cs groundstates requires two phase coherent laser beams. This coherence is achieved by phase-locking the beat-note of the lasers to an external reference oscillator by means of a high speed digital phase frequency discriminator circuit.

We present meaurements on the basic properties of the systems, including passive stability and regulation circuit performance, and report on the current status of integrating them in our experiment.