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Influence of Optical Working on Surface Structure of Plastic Crystals

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Abstract

Single crystals of thallium bromoiodide show domains with inclination angles up to 6°. Fast cutting or thermal shock introduces cracks along the glide planes (110). Turning on a lathe or shaping tears the material from the surface in the form of chips if the cutter moves against the glide plane. Grinding develops flow lines under the surface which have to be removed by proper annealing before final polishing. Precisely shaped surfaces without polishing show good infra-red transmission beyond 2 microns. Plates with rough shaped surfaces show a low transmission at short wave-lengths and high transmission at long wave-lengths. They may find application as filters for the reduction of stray light in infra-red spectrophotometers.

© 1950 Optical Society of America

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