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Journal of Time and Frequency

Measurement of Velocity Distribution in Strontium Atomic Beam by Diode Laser with Narrow Line Width

Shougang Zhang

Published Jan 1, 2009• 1 citation
OpenAlex

Abstract

Based on the Doppler frequency shift effect, the velocity distribution of strontium atomic beam is obtained by measuring the atomic fluorescence spectral induced by a laser beam at a large interaction angle. The comparison and analysis show that the experiment result conforms with the theoretical result fairly well.

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The velocity distribution ofcesium atoms decelmated by a laser diode is measwed using a dye lasm with a narrow spectral width. The "stopped atoms" density is four times greatm than that ofthe free atomic beam at maximum of the Doppler distribution. The average quadratic velocity of these stopped atoms is 3 m/s, and is much lower than the width of the velocity class resonant with the lasm diode (25 m/s). The cooling observed is in good agreement with the simple theoretical mode1 presented in this Note. The possibility of using a "three-frequency" diode is also demonstrated.