Azzam Rasheed M A, Mahmoud Fadi A
University of New Orleans, Department of Electrical Engineering, Lakefront, Louisiana 70148, USA.
Appl Opt. 2002 Jan 1;41(1):235-8. doi: 10.1364/ao.41.000235.
A trilayer pellicle that consists of a high-index center layer that is symmetrically coated on both sides by a low-index film can be designed to produce differential reflection and transmission phase shifts of +/- 90 degrees at oblique incidence and equal throughput for the p and the s polarizations. Such a device splits a beam of incident linearly polarized light into two orthogonal circularly polarized components that travel in well-separated angular directions. Examples of infrared dual quarter-wave retarders that use a symmetrically coated Ge pellicle at 77 degrees angle of incidence are presented. A 50-50% splitter requires a symmetric pellicle with at least five layers. Error analysis shows that the thicknesses of the high-index layers must be tightly controlled. These circular polarization beam splitters are intended for operation with a well-collimated light source and can be used as the basis of a novel circular polarization Michelson interferometer.
可以设计一种由高折射率中心层和两侧对称涂覆的低折射率薄膜组成的三层薄膜，使其在斜入射时产生±90度的差分反射和透射相移，并且p偏振和s偏振具有相同的通量。这样的装置将一束入射的线偏振光分成两个正交的圆偏振分量，它们在角度上分开传播。给出了在77度入射角下使用对称涂覆的锗薄膜的红外双四分之一波延迟器的示例。一个50-50%的分束器需要一个至少有五层的对称薄膜。误差分析表明，高折射率层的厚度必须严格控制。这些圆偏振分束器旨在与准直良好的光源配合使用，并且可以用作新型圆偏振迈克尔逊干涉仪的基础。
