1.06μM/LWIR dual band antireflection coatings for optical windows

1.06 mu m / LWIR dual band antireflection coatings were designed and prepared onto ZnSe substrate. Resonance field effects were investigated at the designing stage to improve laser damage threshold of the coatings, and films were prepared onto substrates with different surface quality and properties of the deposited films were investigated. The packing density and mechanical properties of ZnS films were improved by experiment analysis of ZnS prepared by LAD and optimization of the parameters of this technique. The technique properties of the materials dispersive absorption data based on optimized parameters were stable, and the optical property of the deposited films was improved. Films with transmittance of above 96.5% in the 7.7 similar to 10.5 mu m region and 94% at 1.064 mu m and laser damage threshold above 85MW/cm(2) were prepared with such parameters, and the dual band AR coatings passed environmental tests specified by MIL-C-675C. The coated ZnSe windows meet with the demands of electro-optical systems, in which laser and IR works in common aperture, serviced in battlefield environment.