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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 41, Iss. 7 — Mar. 1, 2002
  • pp: 1353–1365

Experimental comparison of a liquid-crystal point-diffraction interferometer (LCPDI) and a commercial phase-shifting interferometer and methods to improve LCPDI accuracy

Mark J. Guardalben, Lutao Ning, Nieraj Jain, Devon J. Battaglia, and Kenneth L. Marshall  »View Author Affiliations


Applied Optics, Vol. 41, Issue 7, pp. 1353-1365 (2002)
http://dx.doi.org/10.1364/AO.41.001353


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Abstract

We compare the phase measurements of a fused-silica witness sample made with a liquid-crystal point-diffraction interferometer (LCPDI) with measurements made with a Zygo Mark IV xp phase-shifting interferometer and find close agreement. Two phase-shift-error sources in the LCPDI that contribute to measurement discrepancies are frame-to-frame intensity changes caused by the dichroism of the dye and alignment distortions of the host liquid crystal. An empirical model of the phase-shift error caused by the host alignment distortions is presented and used to investigate the performance of two different phase-detection algorithms. It is suggested that by proper choice of LCPDI fabrication parameters and phase-acquisition methods, the device’s accuracy can be significantly improved.

© 2002 Optical Society of America

OCIS Codes
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(120.5050) Instrumentation, measurement, and metrology : Phase measurement
(160.1190) Materials : Anisotropic optical materials
(160.3710) Materials : Liquid crystals
(220.4840) Optical design and fabrication : Testing
(230.3720) Optical devices : Liquid-crystal devices

Citation
Mark J. Guardalben, Lutao Ning, Nieraj Jain, Devon J. Battaglia, and Kenneth L. Marshall, "Experimental comparison of a liquid-crystal point-diffraction interferometer (LCPDI) and a commercial phase-shifting interferometer and methods to improve LCPDI accuracy," Appl. Opt. 41, 1353-1365 (2002)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-41-7-1353

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