Accession Number : ADA023460
Title : Casting of Halide and Fluoride Alloys for Laser Windows
Descriptive Note : Final rept.
Corporate Author : RAYTHEON CO WALTHAM MA RESEARCH DIV
Personal Author(s) : Newberg, R T ; Pappis, J
Report Date : 15 Feb 1976
Pagination or Media Count : 136
Abstract : The problem of residual strain in castings of alkali halides (KCl and SrCl2-doped KCl) and alkaline earth fluorides (CaF2 and SrF2) has been overcome by the development of proper annealing and slow cooling procedures. Semiquantitative analysis of absorption coefficients and scattering centers (produced during improper casting and annealing procedures) has shown a corrleation between the two for both the halides at 10 micrometers and fluorides at 5.25 micrometers. Consistently high quality castings of both CaF2 and SrF2 have been fabricated regardless of the starting materials. The dependence of fracture strength on both surface polish and annealing history is evidence that fracture for the fluorides is determined by surface and/or edge flaws.
Descriptors : *HALIDES , *CASTING , *INFRARED OPTICAL MATERIALS , *LASER MATERIALS , *INFRARED WINDOWS , OPTICAL PROPERTIES , ANNEALING , MECHANICAL PROPERTIES , SURFACE FINISHING , FABRICATION , COOLING , FRACTURE(MECHANICS) , INFRARED LASERS , DEFECTS(MATERIALS) , THERMAL EXPANSION , CHLORIDES , ABSORPTION , POTASSIUM CHLORIDE , FLUORIDES , CRYSTAL GROWTH , STRONTIUM COMPOUNDS , CALCIUM FLUORIDES
Subject Categories : Lasers and Masers
Distribution Statement : APPROVED FOR PUBLIC RELEASE