Attenuation, absorption, and scattering in silver halide crystals and fibers in the mid-infrared

Abstract

The attenuation and the absorption of silver halide crystal and fibers in the mid-IR were measured. The absorption coefficients of silver halide crystals, deformed crystals, and fibers were measured by laser calorimetry at several different wavelengths in the near-IR and the mid-IR. The absorption coefficients of the fibers were higher than those of the deformed crystals and these were higher than those of the un-deformed crystals. We suggest that the absorption behavior is best described by a weak absorption tail. The total attenuation in fibers was measured using the cut back method. The scattering values were calculated by subtracting the absorption coefficients from the total attenuation coefficients. The scattering in the silver halide fibers was ascribed to pores of estimated size of 0.7 μm. We showed that the main contribution to the attenuation of fibers in the mid-IR range was due to scattering and suggested that reducing the scattering will dramatically improve the transmission of silver halide fibers in the mid-IR.