Optical coatings 2-6 microns. Final technical report, June 1976--December 1977

Technical Report · Fri Apr 07 04:00:00 EST 1978

OSTI ID:6862902

Kraatz, P

This report discusses results of an investigation of optical coating materials for the mid infrared with emphasis on the 3.8 micrometers (DF) and 5.3 micrometers (CO) wavelength regions. A data base of experimental information generated under the contract, comprising crystal structure and preferred orientation, deposition parameters, relative growth rates, refractive indices, and absorption coefficients of ten candidate optical thin film materials is presented. This listing of properties is utilized to identify five coating materials, ThF/sub 4/, PbF/sub 2/, SiO, ZnSe, and ZnS for intensive study and application in fabricating laser optics. Intensive studies include optimization of deposition conditions, absorptance and film thickness, effects of polycrystalline substrates upon coating structure and absorptance, and determination of survivability in an HF environment. Results of these investigations and of measurement of absorptance, structure, and preferred orientation in multilayer coatings employing these materials are presented and discussed. In addition, the relative merits of CaF/sub 2/ and SrF/sub 2/ substrates, critical chemical characteristics of substrate surfaces and cleaning procedures, and effects of substrate crystallographic orientation upon single layer film properties are discussed in detail.

• Research Organization: Northrop Research and Technology Center, Hawthorne, CA (USA)
• OSTI ID: 6862902
• Report Number(s): AD-A-053170; NRTC-78-13R
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420300* -- Engineering-- Lasers-- (-1989)
ACTINIDE COMPOUNDS
CHALCOGENIDES
COATINGS
FLUORIDES
FLUORINE COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
LASER MATERIALS
LEAD COMPOUNDS
LEAD FLUORIDES
LEAD HALIDES
OPTICAL PROPERTIES
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SELENIDES
SELENIUM COMPOUNDS
SILICON COMPOUNDS
SILICON OXIDES
SULFATES
SULFUR COMPOUNDS
THORIUM COMPOUNDS
THORIUM FLUORIDES
ZINC COMPOUNDS
ZINC SELENIDES
ZINC SULFATES