Düsseldorf 2007 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 33: Poster Präzisionsmessungen
Q 33.2: Poster
Dienstag, 20. März 2007, 16:30–18:30, Poster C
Narrow linewidth diode laser system for coherent precision spectroscopy — •K. Döringshoff1, A. Wicht1, N. Strauss1, I. Ernsting1, J. Koelemeij1, B. Roth1, R.-H- Rinkleff2, and S. Schiller1 — 1Institut für Experimentalphysik, Heinrich-Heine-Universität Düsseldorf — 2Institut für Gravitationsphysik, Leibnitz-Universität Hannover
Phase-locking of diode lasers to a frequency comb is challenging because of the low signal-to-noise ratio of the corresponding RF beat notes and the large frequency or phase noise bandwidth of grating diode lasers. One approach to ease locking is to develop diode lasers which feature a reduced noise bandwidth. A reduction of the noise bandwidth corresponds to a reduction of the necessary RF-detector bandwidth which in turn results in an improved signal-to-noise ratio of the RF-beat note detection. Here we present a diode laser system which is based on merging the concepts underlying the grating diode laser and the diode laser with resonant optical feedback (GEECDL, grating enhanced external cavity diode laser). Thus we combine the good over-all (few 10 nm) and continuous tuneability (up to 20 GHz) and the simple operation of grating lasers with the narrow line width (few 10 kHz) provided by diode lasers with resonant optical feedback. We frequency lock a GEECDL operating at 1394 nm to an H-maser referenced fs-frequency comb and analyze its relative linewidth and frequency stability. We then demonstrate the lasers capability for high precision spectroscopy by investigating the (ν′=4,J′=3)→(ν=0,J=2) of cold (∼ 10mK) HD+ molecular ions.