Davis J A, Brandt W V, Cottrell D M, Bunch R M
Appl Opt. 1991 Nov 10;30(32):4610-4. doi: 10.1364/AO.30.004610.
Spatial differentiation can be performed by imaging an input pattern with a binary optical element consisting of Fresnel lenses having identical focal lengths but different center locations. Each of these lenses forms an image of the object at a different transverse location in the image plane. If the two lenses have a phase shift of pi rad, the two images will be subtracted, resulting in an image that is differentiated in the direction of the shifted lens positions. We show experimental results in which the optical element is written onto a programmable magneto-optic spatial light modulator.
空间微分可以通过使用由焦距相同但中心位置不同的菲涅耳透镜组成的二元光学元件对输入图案进行成像来实现。这些透镜中的每一个都在像平面的不同横向位置形成物体的图像。如果两个透镜具有π弧度的相移，则两个图像将相减，从而得到一个在透镜位置偏移方向上微分的图像。我们展示了将光学元件写入可编程磁光空间光调制器的实验结果。
