Stuttgart 2012 – wissenschaftliches Programm
Q 23.3: Vortrag
Dienstag, 13. März 2012, 11:00–11:15, V38.01
(contribution withdrawn) Spectroscopy of caesium atoms using optical microfibres — •Jan Hartung, Konstantin Karapetyan, Ulrich Wiedemann, Wolfgang Alt, and Dieter Meschede — Institut für Angewandte Physik, Universität Bonn
We present our results of using optical microfibres for evanescent field spectroscopic measurements of a heated atomic caesium vapour. For this purpose we place a tapered optical fibre in a vacuum chamber where the evanescent field of the fibre waist interacts with the hot caesium vapour. In linear absorption spectroscopy, Doppler-broadened absorption of up to 90% has been observed at 80°C.
With counterpropagating pump and probe light in the microfibre we want to realise Doppler-free saturation spectroscopy. The small extension of the evanescent field (abt. 300nm) makes this experiment sensitive to effects of short transit times, reduced optical pumping, and surface effects such as Van-der-Waals shifts.