Grother P, Casasent D
Appl Opt. 2001 Oct 10;40(29):5253-9. doi: 10.1364/ao.40.005253.
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 (MTF(A)) 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.
调制传递函数（MTF）与幅度调制（m(A)）数据一起使用时，是空间光调制器（SLM）至关重要的相干光学性能指标。本文提出了一种用于电寻址SLM的新的像平面幅度MTF（MTF(A)）测量方法。该方法涉及对写入SLM的方波图案的输出图像进行数字分析。还讨论了调制级效应。给出了两种液晶SLM的光学实验室结果。从SLM偏置的角度指出了在考虑相干光学处理应用时需要考虑幅度调制而非强度调制的情况。
