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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 40, Iss. 34 — Dec. 1, 2001
  • pp: 6223–6228

Dispersion error in white-light Linnik interferometers and its implications for evaluation procedures

Andreas Pförtner and Johannes Schwider  »View Author Affiliations


Applied Optics, Vol. 40, Issue 34, pp. 6223-6228 (2001)
http://dx.doi.org/10.1364/AO.40.006223


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Abstract

White-light interferometry is a standard optical tool with which to measure profiles of discontinuous structures such as diffractive optical elements. But there is one outstanding technological problem: The interferometers have to be symmetric; i.e., the geometrical path lengths in glass have to be the same for both interferometer arms. If these paths in glass are not equal within the field of view, a dispersion error will occur that is rather complicated to compensate for. The error appears in the measured profile in the form of steps of λ/2 in height. A simulation of interferograms disturbed by dispersion deviations is presented, and an algorithm is introduced that eliminates the steps without changing the actual phase information or averaging neighboring pixels. The results are shown with simulated and real data.

© 2001 Optical Society of America

OCIS Codes
(120.2830) Instrumentation, measurement, and metrology : Height measurements
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(120.3940) Instrumentation, measurement, and metrology : Metrology
(120.4290) Instrumentation, measurement, and metrology : Nondestructive testing
(180.3170) Microscopy : Interference microscopy

History
Original Manuscript: January 31, 2001
Revised Manuscript: July 18, 2001
Published: December 1, 2001

Citation
Andreas Pförtner and Johannes Schwider, "Dispersion error in white-light Linnik interferometers and its implications for evaluation procedures," Appl. Opt. 40, 6223-6228 (2001)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-40-34-6223

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