Proceedings PaperCrystalline Infrared Fibers
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Since the development of the first polycrystalline infrared (IR) fiber waveguides by Hughes Research Laboratories, there has been an increasing effort to improve losses in waveguides fabricated from IR transmissive crystalline materials. The current fiber losses of 400 dB/km for KRS-5 (thallium bromoidide) fiber are three orders of magnitude above the intrinsic limit for this material at 10 pm and far above the ultimate projected loss near 10-3 dB/km for this and many other IR crystalline solids. Therefore, applications of present IR fibers in IR sensor systems are limited to lengths less than 2 to 3 m while future long-distance communication links await the development of the ultimate low-loss potential of these materials.