Chemical Vapor Deposition of IR Materials
Abstract
The feasibility of fabricating infrared optical materials with high transmissivity in the 8 to 14 micrometer region of the spectrum by the chemical vapor deposition (CVD) process was demonstrated by depositing small plates of both zinc and cadmium sulfide. Prototype samples were fabricated of zinc sulfide, an economical material satisfying most of the research goals. Two of these prototype samples showed a transmittance in excess of 60 percent from 6 to 12-1/2 micrometers, a flexural strength of 11,000 psi, and a use limit above 200C. A CVD cadmium sulfide sample was made which showed a transmissivity of over 60 percent from 2.5 to 14 micrometers. CVD CdS gave average flexural strengths up to 7800 psi, and small angle scattering as low as one milliradian. The potential for scaling to larger sizes was demonstrated by making 6 x 12 x 1/ 8 in. CDD zinc sulfide plates. No impurity absorptions were found in any of the CVD zinc sulfide or cadmium sulfide materials.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1971
- Accession Number
- AD0887137
Entities
People
- James Pappis
- Samuel R. Steele
Organizations
- RTX