Accession Number : ADA138280

Title :   A Technique for Increasing the Optical Strength of Single-Crystal NaC1 and KC1 through Temperature Cycling.

Descriptive Note : Interim rept. for FY83,

Corporate Author : NAVAL WEAPONS CENTER CHINA LAKE CA

Personal Author(s) : Franck,J B

PDF Url : ADA138280

Report Date : Dec 1983

Pagination or Media Count : 20

Abstract : This report relates a technique for increasing the optical strength of NaC1 and KC1 single-crystal samples. The 1.06-micrometer pulsed laser damage thresholds were increased by factors as large as 4.6 for a bulk NaC1 single-crystal sample. The bulk laser damage breakdown threshold (LDBT) of the crystal was measured prior to and after heat treatment at 800 degrees C using a Nd:YAG laser operating at 1.06 micrometer. Bulk and surface LDBTs were also studied on samples annealed at 400 degrees C. These samples showed differences in damage morphology on both cleaved and polished surfaces, and the cleaved surfaces had improved damage thresholds. However, neither the polished surfaces nor the bulk showed improved threshold at the lower annealing temperature.

Descriptors :   *Infrared windows, *Single crystals, *Sodium chloride, *Potassium chloride, *Laser damage, *Heat treatment, *Annealing, Infrared lasers, Optical equipment components

Subject Categories : Lasers and Masers
      Crystallography
      Optics
      Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE