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Time-domain atom interferometry for subkilohertz optical spectroscopy

K. Sengstock, F. Ruschewitz, Jin-Long Peng, H. Hinderthür, N. Schaffrath, Wolfgang A. Ertmer

Published May 3, 1998• 0 citations
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Optics Letters•May 14, 2004•10 citations
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 x 10(-10) Hz(-1), corresponding to a group velocity of 1800 m/s.