Felstead E B
Appl Opt. 1971 Nov 1;10(11):2468-75. doi: 10.1364/AO.10.002468.
A one-dimensional function may be represented spatially as an aperture in an opaque screen where the aperture's width is proportional to the function. When such an area-modulated screen is the input to a standard coherent optical fourier transformer, the amplitude of the light along one axis on the output plane is proportional to the fourier transform of the original function. Continuous and sampled area modulation for single and multichannel operation are discussed. Experimental agreement with the expected results is obtained. Hybrid configurations combining area and optical-density modulation are discussed.
一维函数在空间上可表示为不透明屏幕上的一个孔径，其中孔径的宽度与该函数成正比。当这样一个面积调制屏幕作为标准相干光学傅里叶变换器的输入时，输出平面上沿一个轴的光振幅与原始函数的傅里叶变换成正比。讨论了用于单通道和多通道操作的连续和采样面积调制。获得了与预期结果的实验一致性。还讨论了结合面积调制和光密度调制的混合配置。
