Casting of Halide and Fluoride Alloys for Laser Windows

The problem of residual strain in castings of alkali halides (KCl and SrCl2 doped KCl) and alkaline earth fluorides (CaF2) has been overcome by the development of proper annealing and slow cooling procedures. Large castings (5- 1/2 in. diameter) of CaF2 and small castings (3 in. diameter) of SrF2 ha...

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Bibliographic Details
Main Authors: Newberg, R T, Pappis, J
Format: Report
Language:English
Subjects:
ABSORPTION SPECTRA
ANNEALING
CALCIUM FLUORIDES
CASTINGS
CHLORIDES
FLUORIDES
HALIDES
INFRARED LASERS
INFRARED OPTICAL MATERIALS
INFRARED SPECTRA
INFRARED WINDOWS
Lasers and Masers
LIGHT SCATTERING
OPTICAL PROPERTIES
Optics
Potassium chlorids
POTASSIUM COMPOUNDS
RESIDUAL STRESS
STRAIN(MECHANICS)
Strontium chloride
STRONTIUM COMPOUNDS
Strontium fluorides
THERMAL CONDUCTIVITY
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Summary:The problem of residual strain in castings of alkali halides (KCl and SrCl2 doped KCl) and alkaline earth fluorides (CaF2) has been overcome by the development of proper annealing and slow cooling procedures. Large castings (5- 1/2 in. diameter) of CaF2 and small castings (3 in. diameter) of SrF2 have been produced with low optical absorption coefficients at 5.25 micrometers. High quality CaF2 castings have been obtained by using as starting material either high purity single crystal chips or 'reagent' grade powder that has been subjected to reactive atmosphere processing (RAP) in teflon vapors.