Non-birefringent thallium iodide thin films for surface protection of halide optical elements

摘要

A method of providing non-birefringent cubic thallium iodide thin films on potassium chloride optical elements. The method of this invention is to deposit thin film alternating layers of thallium iodide and a buffer material such that a composite coating is obtained. The optic buffer material may be lead fluoride. The thallium iodide film made by the method of this invention is highly transparent, insoluble and non-scattering.