Anti-reflection coating film suitable for application on optics made of mixed crystals of thallium iodide and thallium bromide

摘要

An anti-reflection coating film is disclosed which has a three-layer structure and is adapted to be deposited on a substrate made of a mixed crystal of thallium iodide and thallium bromide. The structure comprises a first arsenic triselenide layer, a second lead fluoride layer and a third arsenic triselenide layer for protection of the second layer.