Effects of thermal treatment on the infrared transmission of polycrystalline silver halide fibers.
Polycrystalline silver halide fibers were thermally treated by a variety of heating and quenching procedures. For each procedure, the recrystallization process and the grain-size distribution were investigated. The absorption and scattering coefficients at 10.6 mum and the infrared transmittance spectra in the 3-20 mum wavelength range were also measured. Treatment at temperatures above 170 degrees C and long time intervals generally lead to an increase in grain size, with a dependent increase in absorption and scattering coefficients at 10.6 mum. Heating only to temperatures below 170 degrees C reduced the absorptive and scattering losses. The Rayleigh-Gans scattering model was utilized to describe the scattering behavior. A model involving cation vacancies localized at charged dislocations or casual divalent impurities is suggested to explain the infrared absorption of the fibers.
Bunimovich
D
D
Shalem
S
S
Katzir
A
A