Hamburg 2009 – scientific programme

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A: Fachverband Atomphysik

A 15: Poster I

A 15.9: Poster

Tuesday, March 3, 2009, 16:30–19:00, VMP 9 Poster

Compact and robust tunable cw narrowband near IR-VIS-UV source for high-resolution spectroscopy — •Sergey Vasilyev, Hans-Emanuel Gollnick, Alexander Nevsky, and Stephan Schiller — Institut für Experimentalphysik, Universität Düsseldorf, Universitätsstr 1, 40225 Düsseldorf, Germany

Recent advances in high power fiber laser technology and advent of quasi-phase-matched (QPM) nonlinear materials open new opportunities for development of compact and reliable laser sources for high-resolution spectroscopy.

We report on a narrowband tunable multi-wavelength laser source, designed for laser cooling of the Beryllium ions. The source is based on quintupling of narrowband tunable diode laser (ECDL), amplified to 10 W using the Er doped fiber amplifier. A chain of nonlinear crystals (PPLN, PPSLT, BBO) is used for conversion to the fifth harmonic. The source is turnkey and requires a minimum warm-up time and realignment. The unique feature of the source is tunable multi-wavelength output, spanning from IR to UV: 1540-1570 nm (4 W), 770-785 nm (4 W), 513-523 (1 W), 308-314 nm (1 mW). The UV output power can be further increased by a factor of 20-30 using an enhancement cavity or recently announced UV-capable QPM crystals.

We have performed Doppler-free spectroscopy of the hyperfine-structure components of the molecular iodine using the third harmonic output. These lines could serve for absolute frequency stabilization of the source, providing stable UV radiation e.g. for laser cooling of Beryllium ions.