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Modulation transfer function measurement method for electrically addressed spatial light modulators

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Abstract

The modulation transfer function (MTF), when used with amplitude modulation (m A) data, is a vital coherent optical performance measure for a spatial light modulator (SLM). A new image plane amplitude MTF (MTFA) measurement method is presented for electrically addressed SLMs. It involves digital analysis of the output image of a square-wave pattern written onto the SLM. Modulation-level effects are also addressed. Optical laboratory results are presented for two liquid-crystal SLMs. The need to consider amplitude rather than intensity modulation (when coherent optical processing applications are considered) is noted in terms of SLM biasing.

© 2001 Optical Society of America

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