Darmstadt 2008 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 25: Laseranwendungen (Spektroskopie)
Q 25.4: Talk
Tuesday, March 11, 2008, 17:15–17:30, 3H
Spectroscopy of the two-photon resonance in atomic mercury vapour — •Thomas Beyer, Martin Scheid, Daniel Kolbe, Frank Markert, and Jochen Walz — University of Mainz, Germany
We investigated the 61S – 71S two-photon resonance in mercury vapour driven by two different tuneable laser fields, one of them near the 61S – 63P transition. This laser field is provided by a frequency-quadrupled solid-state Yb:YAG disk laser system generating up to 750mW output power at 253.7nm. The second laser field is provided by a grating-stabilized GaAs diode laser, boosted by tapered amplifiers and then frequency-doubled to 408.7nm, yielding output powers up to 30mW.
Spectra for different detunings and mercury vapour pressures are presented and compared to theory involving solutions to the Optical Bloch Equations in a three-level quantum system. The results are of interest for the generation of continuous-wave coherent radiation at 121.56nm, which is needed for cooling of anti-hydrogen, because the conversion efficiency for this process is strongly enhanced by selecting fundamental wavelengths near these mercury resonances.