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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 42, Iss. 19 — Jul. 1, 2003
  • pp: 3888–3895

Wavelength-scanning interferometry of a transparent parallel plate with refractive-index dispersion

Kenichi Hibino, Bozenko F. Oreb, and Philip S. Fairman  »View Author Affiliations


Applied Optics, Vol. 42, Issue 19, pp. 3888-3895 (2003)
http://dx.doi.org/10.1364/AO.42.003888


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Abstract

Testing for flatness of an optical parallel plate in a Fizeau interferometer suffers from problems caused by multiple-beam interference noise. Each internal-reflection component can be separated from the signal by its modulation frequency in a wavelength-scanned interferometer; however, the frequency depends on the thickness and the refractive-index dispersion of the test plate and on the nonlinearity of the scanning source. With a new 19-sample wavelength-scanning algorithm we demonstrate the elimination of the reflection noise, the effect of the dispersion up to the second order of the reflectance of the test plate, and as the nonlinearity of the source. The algorithm permits large tolerance in the air-gap distance, thus making it somewhat independent of the thickness of the test plate. The minimum residual reflection noise with this algorithm for testing a glass plate is ∼λ/600. Experimental results show that the front surface of the test plate was measured within 1 nm rms of its true shape over a 230-mm-diameter aperture.

© 2003 Optical Society of America

OCIS Codes
(120.0120) Instrumentation, measurement, and metrology : Instrumentation, measurement, and metrology
(120.3180) Instrumentation, measurement, and metrology : Interferometry

History
Original Manuscript: July 4, 2002
Revised Manuscript: December 2, 2002
Published: July 1, 2003

Citation
Kenichi Hibino, Bozenko F. Oreb, and Philip S. Fairman, "Wavelength-scanning interferometry of a transparent parallel plate with refractive-index dispersion," Appl. Opt. 42, 3888-3895 (2003)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-42-19-3888

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