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Q: Quantenoptik und Photonik
Q 31: Poster Fallen und Kühlung
Q 31.14: Poster
Dienstag, 14. März 2006, 16:30–18:30, Labsaal
UV light-induced atom desorption for large — •Oliver Topic, Thorsten Henninger, Carsten Klempt, Wolfgang Ertmer, and Jan Arlt — Institut fuer Quantenoptik, Universit*at Hannover, Welfengarten 1, 30167 Hannover
We show that light-induced atom desorption (LIAD) [1] can be
used as a flexible atomic source for large 87Rb and
40K magneto-optical traps. The use of LIAD at short
wavelengths allows for fast switching of the desired vapor
pressure. This is interesting effect for experiments in a
single vacuum
chamber, because it permits long trapping and coherence times.
The wavelength dependence of the LIAD effect for both species
was explored in a range from 253 nm to 630 nm in an uncoated
quartz cell.
Only a few mW/cm2 of near-UV light produce partial
pressures that are high enough to saturate a magneto-optical
trap at 3.5 × 109 87Rb atoms or 7 ×
107 40K atoms. Loading rates as high as 1.2 ×
109 87Rb atoms/s and 8 × 107 40K
atoms/s were achieved without the use of a secondary atom
source. After the desorption light is turned off, the
pressure quickly decays back to equilibrium with a time
constant as short as 200 µ s, allowing for long trapping
lifetimes after the MOT loading phase.
[1] C. Klempt, T. van Zoest, T. Henninger, O. Topic, E. Rasel, W. Ertmer and J. Arlt cond-mat/0509241, accepted in PRA