Sagnac-interferometer-based characterization of spatial light modulators

Jian Wei Tay, Michael A. Taylor, and Warwick P. Bowen

Applied Optics 48, 2236-2242 (2009)


A method for characterizing the phase response of spatial light modulators (SLMs) by using a Sagnac interferometer is proposed and demonstrated. The method represents an improvement over conventional diffraction-based or interferometric techniques by providing a simple and accurate phase measurement while taking advantage of the inherent phase stability of a Sagnac interferometer. As a demonstration, the phase response of a commercial liquid crystal on a silicon SLM is characterized and then linearized by using a programmable lookup table. The transverse phase profile over the SLM surface is also measured.

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