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Proceedings Paper

Reduction of optical field noise by differential detection in atomic clocks based on coherent population trapping
Author(s): Vladislav Gerginov; Svenja Knappe; Vishal Shah; John Kitching; Leo Hollberg
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Paper Abstract

We present preliminary results showing that some noise sources in vapor cell atomic clocks based on coherent population trapping (CPT) can be suppressed with differential detection. The scheme we propose differs from more conventional differential detection in that both optical fields pass through the alkali vapor cell but have different polarizations, one circular and one linear. Because CPT resonances are only excited by the circularly polarized beam, the linearly polarized beam can be used to reduce several important sources of noise. With this technique, we demonstrate reduction of the short-term frequency instability of a CPT atomic frequency reference by a factor of about 1.5.

Paper Details

Date Published: 5 March 2007
PDF: 5 pages
Proc. SPIE 6604, 14th International School on Quantum Electronics: Laser Physics and Applications, 66040J (5 March 2007); doi: 10.1117/12.726893
Show Author Affiliations
Vladislav Gerginov, Univ. of Notre Dame (United States)
Svenja Knappe, Univ. of Colorado, Boulder (United States)
Vishal Shah, Univ. of Colorado, Boulder (United States)
John Kitching, NIST (United States)
Leo Hollberg, NIST (United States)


Published in SPIE Proceedings Vol. 6604:
14th International School on Quantum Electronics: Laser Physics and Applications

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