Silver halide (AgCl<sub><i>x</i></sub> Br<sub>1-<i>x</i></sub>) crystals were extruded to form polycrystalline fibers that are highly transparent in the spectral range 3–30 μm. Ordered bundles consisting of as many as 9000 fibers were fabricated by multiple extrusion steps. The transmission loss of an individual fiber in the 100-fiber bundles was 0.12 dB/cm, and the cross talk between neighboring fibers in the 900-fiber bundles was 25%. Thermal images of bodies at room temperature have been transmitted through the bundles. Such ordered bundles provide a solution for the problem of thermal imaging in regions where there is no line of sight between a thermal camera and a warm object.
© 2000 Optical Society of America
E. Rave, L. Nagli, and A. Katzir, "Ordered bundles of infrared-transmitting AgClBr fibers: optical characterization of individual fibers," Opt. Lett. 25, 1237-1239 (2000)