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Optics Letters

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  • Editor: Alan E. Willner
  • Vol. 35, Iss. 22 — Nov. 15, 2010
  • pp: 3853–3855

Modulation-free frequency stabilization of external-cavity diode laser based on a phase-difference biased Sagnac interferometer

Fang Wei, Dijun Chen, Zujie Fang, Haiwen Cai, and Ronghui Qu  »View Author Affiliations


Optics Letters, Vol. 35, Issue 22, pp. 3853-3855 (2010)
http://dx.doi.org/10.1364/OL.35.003853


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Abstract

We propose a modulation-free technique for frequency stabilization of an external-cavity diode laser (ECDL) by using a phase-difference biased Sagnac interferometer to produce dispersion spectroscopic error signals. A half-wave plate and a total internal reflection prism are inserted into the loop to provide a phase-difference bias between the clockwise and counterclockwise beams with perpendicular polarizations, instead of the previous method with misaligned optical paths. In the experiments, the frequency of the Littman–Metcalf configuration ECDL is locked at the transition of the Rb atomic vapor, and the frequency fluctuation is suppressed from 8 to less than 0.5 MHz peak to peak. It is shown that this scheme is simple, robust, low cost, and it shows promise for use in a variety of related applications.

© 2010 Optical Society of America

OCIS Codes
(140.2020) Lasers and laser optics : Diode lasers
(140.3425) Lasers and laser optics : Laser stabilization

ToC Category:
Lasers and Laser Optics

History
Original Manuscript: August 19, 2010
Revised Manuscript: September 29, 2010
Manuscript Accepted: October 18, 2010
Published: November 12, 2010

Citation
Fang Wei, Dijun Chen, Zujie Fang, Haiwen Cai, and Ronghui Qu, "Modulation-free frequency stabilization of external-cavity diode laser based on a phase-difference biased Sagnac interferometer," Opt. Lett. 35, 3853-3855 (2010)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-35-22-3853


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