Technique For Increasing The Optical Strength Of Single-Crystal NaCI Through Temperature Cycling

Jerome B. Franck; MJ Soileau

doi:10.1117/12.932503

26 February 1982 Technique For Increasing The Optical Strength Of Single-Crystal NaCI Through Temperature Cycling

Jerome B. Franck, MJ Soileau

Proceedings Volume 0297, Emerging Optical Materials; (1982) https://doi.org/10.1117/12.932503
Event: 25th Annual Technical Symposium, 1981, San Diego, United States

Abstract

This paper relates a technique for increasing the optical strength of single-crystal NaCl. The 1.06-μm pulse laser-induced damage threshold was increased by a factor of 4.6 by a temperature annealing process. The starting material for this work was single-crystal "laser grade" NaCl acquired from the Harshaw Chemical Company. The bulk laser-induced damage threshold of the crystal was measured prior to and after the heat treatment using a Nd:YAG laser operated at 1.06 pm in the TEM00 spatial mode with a pulse width of 9 nsec, full width at half maximum. After the laser-induced damage threshold of the untreated crystal was meas-ured, it was mounted in a quartz tube and placed in an oven for the heat treatment. The quartz tube was continuously flushed with dry nitrogen throughout the heat treatment. The NaC1 sample was slowly heated to 794°C (approximately 7°C below its melting temperature). The sample was maintained at this temperature for a short time and was then removed from the oven to allow rapid cooling. The specimen required repolishing after the heat treatment because of surface sublimation which occurred at temperatures near melting. After repolishing, the bulk laser-induced breakdown intensity was remeasured and found to be 4.6 times greater than the value measured for the untreated crystal.

Citation Download Citation

Jerome B. Franck and MJ Soileau "Technique For Increasing The Optical Strength Of Single-Crystal NaCI Through Temperature Cycling", Proc. SPIE 0297, Emerging Optical Materials, (26 February 1982); https://doi.org/10.1117/12.932503

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