Preparation of composite anti-reflective and protective films with diamond-like carbon films coated on ZnS substrate

Common anti-reflective films on Sulfide Zinc(ZnS) Substrate has low hardness and poor protective effect, thus cannot meet the requirement of harsh environment. Composite anti-reflective and protective films with ZnS, YbF₃ and DLC films are developed. This Diamond-like Carbon(DLC) films with high infrared transmittance and high hardness is developed by quasi-molecule laser in vacuum. The deposition parameters and performance of DLC and YbF₃ films are optimized. The adhesion performance of the composite films is improved by introducing optimized adhesive coating, optimized thickness of DLC films and so on. The composite films has many advantages such as high transmittance in far IR region, good adhesion, anti-scratch performance, it also can pass boil water test, tape adhesion test and scrub test.