Cheng J C, Nafie L A, Allen S D, Braunstein A I
Appl Opt. 1976 Aug 1;15(8):1960-5. doi: 10.1364/AO.15.001960.
An improved photoelastic modulator (PEM) employing two piezoelectric transducers and incorporating a new ir zmc selenide (ZnSe) optical element is described. The 0.64-cm thick PEM is capable of obtaining quarter-wave retardation from 0.55 microm to 13.0 microm. Previously no single, high quality, low static strain PEM element existed for this wavelength range. We have also constructed other PEM's using optical elements composed of fused quartz, calcium fluoride, and KRS-5. The important optical and mechanical properties are measured and compared.
描述了一种改进的光弹性调制器（PEM），它采用两个压电换能器，并包含一个新型红外硒化锌（ZnSe）光学元件。这种厚度为0.64厘米的PEM能够在0.55微米至13.0微米范围内实现四分之一波长延迟。此前，在该波长范围内不存在单一的、高质量、低静态应变的PEM元件。我们还使用由熔融石英、氟化钙和KRS-5组成的光学元件构建了其他PEM。测量并比较了其重要的光学和机械性能。
