Hamburg 2009 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 29: Poster I

Q 29.18: Poster

Tuesday, March 3, 2009, 16:30–19:00, VMP 8 Foyer

Continuous-wave single-frequency mid-IR optical parametric oscillator for spectroscopy of cold molecules — •Michael G. Hansen, Sergey V. Vasilyev, Tobias Schneider, and Stephan Schiller — Institut für Experimentalphysik, Universität Düsseldorf, Universitatsstr. 1, 40225 Düsseldorf

A continuous-wave singly-resonant optical parametric oscillator covering the 2.56−2.9 µ m-range for ro-vibrational spectroscopy of cold HD⁺ has been developed. Planned applications are state-selective mechanical excitation using the optical dipole force [1], optical pumping and two-photon spectroscopy [2].

A PPLN-crystal with three grating-periods is used as the nonlinear material. With a 10 Watt Nd:YAG pump laser free-running output-powers of up to 2.1 Watt and a threshold of 4 Watt are achieved. Mode-hop-free oscillation is achieved by introduction of an etalon, resulting in reduced output-power of 1.5 Watt. Absorption in the crystal and in the air reduce the output-power to 0.8 Watt around 2.77 µ m.

[1] Koelemeij et al., Phys. Rev. A 76, 023413 (2007)

[2] Karr et al., J. Phys. B 38, 853-866 (2005)