Hannover 2013 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 43: Poster II
Q 43.14: Poster
Mittwoch, 20. März 2013, 16:00–18:30, Empore Lichthof
Four-wave mixing in a three-color cavity — •Peter Micke1,2, Thomas Diehl1,2, Andreas Koglbauer1,2, Daniel Kolbe1,2, Matthias Stappel1,2, Ruth Steinborn1,2, and Jochen Walz1,2 — 1Johannes Gutenberg-Universität Mainz, 55099 Mainz — 2Helmholtz-Institut Mainz, 55099 Mainz
Continuous coherent vacuum ultraviolet (VUV) radiation has fascinating applications. Radiation at Lyman-α (121,6 nm) is needed for future laser cooling of antihydrogen in experiments to test the fundamental symmetry between matter and antimatter. Radiation at slightly longer wavelengths can be used for Rydberg excitation of trapped ions in quantum information processing.
We use solid-state laser systems to produce continuous coherent VUV radiation by four-wave sum-frequency mixing (FWM) in Hg vapor. We plan to boost the VUV yield by enhancing the power of the fundamental beams at 254 nm, 408 nm, and 545 nm in a three-color cavity. A small Hg vapor cell is placed in the common focus of the cavity. Brewster prisms are used to split the three beams into separate collimated cavity return paths for coupling and stabilization. Previous experiments have been limited by a residual deposition on the vacuum side of the Hg cell windows, induced by the fundamental beam at 254 nm. This ruins the enhancement of the cavity. We are presently constructing a miniature cryogenic trap to avoid this problem in the future.