Matsumura M
Appl Opt. 1975 Mar 1;14(3):660-5. doi: 10.1364/AO.14.000660.
Experimental results are given that show that a random phase shifter (RPS) is effective in reducing speckle noise caused by optical defects in coherent imaging systems, including holographic imaging systems. Here the RPS is composed of many tiny transparent blocks, each of which gives a definite phase shift such as O or pi to the transmitting light; and the distribution of the phase shift is two-dimensionally random. The optical defects are scattering centers such as scratches or dust on lenses or on the hologram medium in the case of holographic imaging systems.
给出的实验结果表明，随机相移器（RPS）在减少相干成像系统（包括全息成像系统）中由光学缺陷引起的散斑噪声方面是有效的。这里的随机相移器由许多微小的透明块组成，每个透明块都会给透射光一个确定的相移，如0或π；并且相移的分布是二维随机的。光学缺陷是散射中心，例如在全息成像系统中透镜上或全息图介质上的划痕或灰尘。
