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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 38, Iss. 19 — Jul. 1, 1999
  • pp: 4089–4094

Heterodyne interferometer with subatomic periodic nonlinearity

Chien-ming Wu, John Lawall, and Richard D. Deslattes  »View Author Affiliations


Applied Optics, Vol. 38, Issue 19, pp. 4089-4094 (1999)
http://dx.doi.org/10.1364/AO.38.004089


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Abstract

A new, to our knowledge, heterodyne interferometer for differential displacement measurements is presented. It is, in principle, free of periodic nonlinearity. A pair of spatially separated light beams with different frequencies is produced by two acousto-optic modulators, avoiding the main source of periodic nonlinearity in traditional heterodyne interferometers that are based on a Zeeman split laser. In addition, laser beams of the same frequency are used in the measurement and the reference arms, giving the interferometer theoretically perfect immunity from common-mode displacement. We experimentally demonstrated a residual level of periodic nonlinearity of less than 20 pm in amplitude. The remaining periodic error is attributed to unbalanced ghost reflections that drift slowly with time.

© 1999 Optical Society of America

OCIS Codes
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(120.5050) Instrumentation, measurement, and metrology : Phase measurement

History
Original Manuscript: January 11, 1999
Revised Manuscript: April 22, 1999
Published: July 1, 1999

Citation
Chien-ming Wu, John Lawall, and Richard D. Deslattes, "Heterodyne interferometer with subatomic periodic nonlinearity," Appl. Opt. 38, 4089-4094 (1999)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-38-19-4089

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