Abstract

Subkilohertz spectroscopy by coherent population trapping (CPT) has been performed in Na atomic vapor. The system employs a frequency-swept acousto-optic modulator for bichromatic excitation as well as a heterodyne–lock-in detection technique that permits the direct measurement of the CPT dispersion curves at a good signal-to-noise ratio. A CPT linewidth of 400 Hz was measured as well as a steep refractive-index dispersion of as much as 3.3×10-10 Hz-1, corresponding to a group velocity of 1800 m/s.

© 2004 Optical Society of America

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