The modulation transfer function (MTF) using amplitude modulation (mA) data is a vital coherent optical performance measure for a spatial light modulator (SLM). A new image plane MTFA (amplitude MTF) 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 not intensity modulation (when coherent optical processing applications are considered) is noted in terms of SLM biasing.
Citation: Applied Optics
Issue: No. 29
Pub Type: Journals
modulation transfer function, resolution, spatial light modulator