Dichroic infrared absorption of dipole centers in cadmium halide crystals

Observation of Scattering and Absorption Centers in Lead Fluoride Crystals

For the first time, lead fluoride is used as a fast and compact material in electromagnetic calorimetry. Excellent optical and mechanical properties of the pure Cherenkov crystals are necessary for the A4 collaboration to perform a measurement of the nucleon’s strange form factors. Visible scattering and absorption centers as well as surface damages have been investigated to characterize the qu...

FAR-INFRARED ABSORPTION DUE TO IMPURITIES IN CsBr CRYSTALS

Infrared Absorption Properties of LiH, LiD Mixed Crystals

Low absorption chlorinated liquid crystals for infrared applications

We report a wide nematic range and low absorption loss chlorinated liquid crystal mixture, designated as IR-M2, for mid-wave infrared applications. IR-M2 is quite transparent in the 3.8-5.0 μm window while keeping a high birefringence (Δn~0.194) in the infrared region and a modest dielectric anisotropy. For long-wave infrared applications, we propose another high Δn chlorinated cyanoterphenyl c...

Low absorption liquid crystals for mid-wave infrared applications.

A partially fluorinated terphenyl liquid crystal with low absorption in both mid-wave infrared (MWIR) and near IR regions is developed and its properties evaluated. This compound exhibits a nematic phase (although only about 2 °C), reasonably high birefringence (Δn~0.2), low visco-elastic coefficient, and modest dielectric anisotropy (Δε = -2.7). This compound serves as an important first examp...