Simple method to calibrate phase modulators for use in dynamic phase-shifting interferometry

A simple method is proposed to calibrate phase shift modu- lators used in phase-shifting interferometry for algorithms requiring p/2 phase shifts. The method provides a convenient in situ calibration with- out any change in experimental setup for a wide range of phase shift modulators such as piezoelectric translators (PZTs), Pockels cells, etc. The calibration by the proposed method is fast, efficient, and accurate. The performance of the new method is demonstrated by calibration of a Pockels cell in a phase-stepped speckle interferometer. The results ob- tained from the new calibration method are found to agree to within 2% of those from a previously described method for the calibration of non- linear phase modulators. © 2004 Society of Photo-Optical Instrumentation Engi- neers. (DOI: 10.1117/1.1810532)

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