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Chinese Optics Letters

Imaging an atomic beam using fluorescence

何明, 王谨, 詹明生

Published Jan 1, 2003• 0 citations
OpenAlex

Abstract

A fluorescence detection scheme is applied to image an atomic beam. Using two laser diodes as the sources of detection light and pumping light respectively, the fluorescence image of the atomic beam is then observed by a commercial CCD-camera, which is corresponding to the atomic state and velocity distribution. The detection scheme has a great utilization in the experiments of cold atoms and atomic optics.

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A fluorescence detection scheme is applied to image an atomic beam. Using two laser diodes as the sources of detection light and pumping light respectively, the fluorescence image of the atomic beam is then observed by a commercial CCD-camera, which is corresponding to the atomic state and velocity distribution. The detection scheme has a great utilization in the experiments of cold atoms and atomic optics.
A fluorescence detection scheme coupled to a highly sensitive nitrogen-cooled CCD camera is used to image the spatial distribution of a low-density falling rubidium atomic cloud released from an optical trap. The falling cloud passes through a thin probe laser beam tuned to resonance. The performance of the scheme is illustrated in the analysis of cold atomic clouds collimated by pinholes during their free fall under the influence of gravity. Clouds of approximately 10(4) atoms and with typically 10(6) at./cm(3) density are analyzed spatially with 24-mum resolution. This method is compared with different atomic cloud imaging techniques.
The detection of optical resonances by observation of the fluorescence light emitted from a fast atomic beam of Na interacting with a collinear laser beam is limited in sensitivity by optical pumping processes. In the experiment reported here, we take advantage of the optical pumping by using a second collinear laser beam, achieving then a gain in fluorescence signal. The effects of the lasers power and polarization on line shapes have been studied in the single laser excitation case as well as in the two laser beams one.
Three different fluorescence detection methods for matter interferometry are explored in the paper. Firstly, molecules can be detected in free flight, when the dilute particle beam is excited by intense laser light. The emitted fluorescent light is collected by a sensitive CCD camera. Secondly, for molecules up to about 1000 amu the molecular interference pattern, with a fringe period of about 1/spl mu/m, can be directly adsorbed on a surface and read out using high-resolution fluorescence microscopy. A third and novel detection scheme combines the high spatial resolution of Talbot Lau interferometry with the high detection efficiency of surface adsorbed fluorophores.