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Optics Letters

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  • Vol. 29, Iss. 10 — May. 14, 2004
  • pp: 1141–1143

Subkilohertz linewidths measured by heterodyne-detected coherent population trapping in sodium vapor

Koji Motomura, Takanori Koshimizu, Ken-ichi Harada, Hirotaka Ueno, and Masaharu Mitsunaga  »View Author Affiliations


Optics Letters, Vol. 29, Issue 10, pp. 1141-1143 (2004)
http://dx.doi.org/10.1364/OL.29.001141


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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 ~400Hz was measured as well as a steep refractive-index dispersion of as much as 3.3×10-10Hz -1, corresponding to a group velocity of 1800 m/s.

© 2004 Optical Society of America

OCIS Codes
(020.1670) Atomic and molecular physics : Coherent optical effects
(020.2930) Atomic and molecular physics : Hyperfine structure
(020.7490) Atomic and molecular physics : Zeeman effect
(270.1670) Quantum optics : Coherent optical effects
(300.6320) Spectroscopy : Spectroscopy, high-resolution
(300.6420) Spectroscopy : Spectroscopy, nonlinear

Citation
Koji Motomura, Takanori Koshimizu, Ken-ichi Harada, Hirotaka Ueno, and Masaharu Mitsunaga, "Subkilohertz linewidths measured by heterodyne-detected coherent population trapping in sodium vapor," Opt. Lett. 29, 1141-1143 (2004)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-29-10-1141


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