Hannover 2010 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 55: Poster II
Q 55.75: Poster
Thursday, March 11, 2010, 16:00–19:00, Lichthof
Continuous-wave Lyman-α generation by four-wave-mixing in mercury — •Andreas Koglbauer, Martin Scheid, Daniel Kolbe, Ruth Steinborn, Sven Richter, and Jochen Walz — Institut für Physik, Johannes Gutenberg-Universität Mainz, D-55099 Mainz
For future precision measurements on anti-hydrogen, laser-cooling of the magnetically trapped atoms down to a milli-Kelvin range is essential. We present the generation of Lyman-α-light on the cooling-transition at 121.56 nm wavelength by sum-frequency four-wave-mixing (FWM) in mercury-vapor using solid-state fundamental laser systems. In addition to the enhancement utilizing the two-photon 61S−71S resonance, the tuning range of our fundamental laser system enabled us to investigate the influence of the 61S−63P resonance on the FWM-process. This also gave rise to the observation of two-photon absorption laser induced stimulated emission (TALISE) on the 61P−71S transition at 1014 nm.
At slightly shorter wavelength than Lyman-α, the mixing process can use a triple one-photon resonant scheme. This gives a 104-fold increase of the nonlinear susceptibility and a total vacuum UV power of 6 µW.
The current status of new projects like Lyman-α generation in a three-color resonator and in hollow-core fibers is presented.