Ih C S, Baxter L A
Appl Opt. 1978 May 1;17(9):1447-54. doi: 10.1364/AO.17.001447.
An improved version of the random spatial phase modulator (RSPM) reported recently by one of us is described. Using the improved RSPM, a theoretical value of the SNR of several thousand can be achieved. Experimental results are presented verifying that speckle can be completely eliminated using RSPM. The measured SNR exceeds 100, and there is no visually detectable difference between images obtained with RSPM laser light and those with white light even for an optical system of f/600. The effective decorrelation distances for different diffusers and their dependence on the aperture of the RSPM are investigated. An application of RSPM to coherent spatial filtering is demonstrated.
本文描述了我们其中一人最近报道的随机空间相位调制器（RSPM）的改进版本。使用改进后的RSPM，可以实现数千的理论信噪比。给出的实验结果验证了使用RSPM可以完全消除散斑。测量得到的信噪比超过100，即使对于f/600的光学系统，用RSPM激光获得的图像与用白光获得的图像之间在视觉上也没有可检测到的差异。研究了不同扩散器的有效去相关距离及其对RSPM孔径的依赖性。展示了RSPM在相干空间滤波中的应用。
