Abstract
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 µm and the infrared transmittance spectra in the 3–20 µm wavelength range were also measured. Treatment at temperatures above 170 °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 µm. Heating only to temperatures below 170 °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.
© 1997 Optical Society of America
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