Antireflection coating for potassium chloride

摘要

An antireflection coating for a potassium chloride substrate has a first arsenic trisulfide (As2S3) layer, a lead fluoride (PbF2) layer and a second arsenic trisulfide (As2S3) layer which are formed on at least one major surface of the potassium chloride (KCl) substrate in the order named. The antireflection coating withstands to irradiate of a high-power carbon dioxide gas laser. The antireflection coating also has good optical characteristics and moisture resistance.