Evaluation of optical loss minima in thallium halide crystals

Abstract Fundamental optical losses in the highly transparent region for thallium halide KRS-6 and KRS-5 crystals were evaluated. The projected loss minima are 12 × 10−−4 dB/ km at 7.9 μm for KRS-6 and 7 × 10−−4 dB/km at 12.9 μm for KRS-5 crystals. The material dispersion becomes zero near 5.05 μm for KRS-6 and near 6.62 μm for KRS-5 crystals.