Variable-reflectance thin-film polarization-independent beam splitters for 06328- and 106-μm laser light

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Abstract
Truly polarization-independent beam splitters for 0.6328- and 10.6-μm (He–Ne and CO2) laser radiation are designed using single-layer-coated (Cleartran) ZnS and Ge prisms. These devices are found to be reasonably achromatic, their reflectance (beam-splitting ratio) can be varied over a wide range with little accompanying polarization error, and they are tolerent to small film-thickness and film refractive-index errors.