Berlin 2001 – wissenschaftliches Programm
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Q: Quantenoptik
Q 10: Poster: Nonlinear Optics
Q 10.6: Poster
Dienstag, 3. April 2001, 12:30–15:00, AT2
A robust frequency-doubled laser system at 326 nm for efficient cooling of fast stored ion beams — •P. Friedmann1, U. Eisenbarth1, B. Eike1, R. Grimm2, D. Schwalm1, and M. Weidemüller1 — 1Max-Planck-Institut für Kernphysik, 69029 Heidelberg, Germany — 2Institut für Experimentalphysik, Universität Innsbruck, Austria
At the Heidelberg Test Storage Ring (TSR), 9Be+ ions at 7.3 MeV are laser-cooled to very high phase-space densities. For laser cooling in a one-dimensional molasses [1], a tunable laser system at 326 nm has been set up. The laser light is generated via frequency doubling of a tunable dye laser (652 nm) in a non-linear optical crystal (LiIO3, Brewster cut). To increase conversion efficiency, the fundamental wave is enhanced by an optical resonator in bow-tie geometry. The astigmastism of the generated UV light is compensated yielding in an excellent beam quality. This allows the use of a position stabilization system for optimum overlap between laser and ion beam over several meters, which is an essential requirement for efficient laser cooling at a storage ring. We achieved a total cw UV laser power of up to 30 mW with an input power of 550 mW. The UV scan range exceeds 30 GHz. To suppress optical pumping between the two hyperfine-splitted ground states of 9Be+, a second frequency at a difference of 1.3 GHz is generated by an AOM system. Applications of the laser system to ion beam diagnostics and efficient laser cooling are presented.
[1] See presentation by U. Eisenbarth et al.