Abstract
We measure the transverse velocity distribution in a thermal Sr atomic beam precisely by velocity-selective saturated fluorescence spectroscopy. The use of an ultrastable laser system and the narrow intercombination transition line of Sr atoms mean that the resolution of the measured velocity can reach 0.13 m/s, corresponding to 90 μK in energy units. The experimental results are in very good agreement with the results of theoretical calculations. Based on the spectroscopic techniques used here, the absolute frequency of the intercombination transition of 88Sr is measured using an optical-frequency comb generator referenced to the SI second through an H maser, and is given as 434 829 121 318(10) kHz.
Highlights
We measure the transverse velocity distribution in a thermal Sr atomic beam precisely by velocity-selective saturated fluorescence spectroscopy
Based on the spectroscopic techniques used here, the absolute frequency of the intercombination transition of 88Sr is measured using an optical-frequency comb generator referenced to the SI second through an H maser, and is given as 434 829 121 318(10) kHz
We report the precise measurement of the transverse velocity distribution of a well-collimated thermal strontium beam by velocity-selective saturated fluorescence spectroscopy
Summary
Velocity-selective saturation (fluorescence) spectroscopy is a powerful technique that is widely used for high resolution measurements We use it here to measure the velocity distribution of the atomic beam precisely. Velocity-selective saturation (fluorescence) spectroscopy is obtained by the use of two counterpropagating laser beams (i.e. the probe and pump beams) perpendicular to the atomic beam. These beams are generated by two acousto-optical modulators (AOMs) with the same double-pass configurations.
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