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Optics Letters

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  • Editor: Alan E. Willner
  • Vol. 35, Iss. 24 — Dec. 15, 2010
  • pp: 4202–4204

Subpicometer length measurement using heterodyne laser interferometry and all-digital rf phase meters

Magnus T. L. Hsu, Ian C. M. Littler, Daniel A. Shaddock, Jan Herrmann, Richard B. Warrington, and Malcolm B. Gray  »View Author Affiliations


Optics Letters, Vol. 35, Issue 24, pp. 4202-4204 (2010)
http://dx.doi.org/10.1364/OL.35.004202


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Abstract

We present an all-digital phase meter for precision length measurements using heterodyne laser interferometry. Our phase meter has a phase sensitivity of 3 μrad / Hz at signal frequencies of 1 Hz and above. We test the performance of our phase meter in an optical heterodyne interferometric configuration, using an active Sagnac interferometer test bed that is flexible and low noise. We demonstrate more than 70 dB of laser frequency noise suppression to achieve an optical phase sensitivity of 5 μrad / Hz and a corresponding displacement sensitivity of 0.5 pm / Hz at signal frequencies above 10 Hz . In addition, we demonstrate the ability of our phase meter to follow full fringe signals accurately at 100 Hz and to track large signal excursions in excess of 10 5 fringes without cycle slipping. Finally, we demonstrate a cyclic error of 1 pm / Hz , above 10 Hz .

© 2010 Optical Society of America

OCIS Codes
(040.2840) Detectors : Heterodyne
(120.0120) Instrumentation, measurement, and metrology : Instrumentation, measurement, and metrology

ToC Category:
Instrumentation, Measurement, and Metrology

History
Original Manuscript: October 21, 2010
Manuscript Accepted: November 15, 2010
Published: December 14, 2010

Citation
Magnus T. L. Hsu, Ian C. M. Littler, Daniel A. Shaddock, Jan Herrmann, Richard B. Warrington, and Malcolm B. Gray, "Subpicometer length measurement using heterodyne laser interferometry and all-digital rf phase meters," Opt. Lett. 35, 4202-4204 (2010)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-35-24-4202


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