Accession Number : ADA301238

Title :   Neodymium Laser Glass Improvement Program.

Descriptive Note : Final rept. 1 May 62-1 Mar 71,

Corporate Author : AMERICAN OPTICAL CORP SOUTHBRIDGE MA RESEARCH DIV

Personal Author(s) : Woodcock, Richard F.

PDF Url : ADA301238

Report Date : JUL 1973

Pagination or Media Count : 134

Abstract : This final report describes work carried out over a nine year period to improve the properties and performance of Nd laser glass. One of the first tasks was the reduction of absorption at 1.06 micron to a 0.1-0.2%/cm level by the identification and elimination of such impurities as iron. Fluorescent lifetime was investigated (1) as a function of host glass composition to provide data on tbe range of values attainable for this important parameter, and (2) as a function of time, temperature and Nd2O3 concentration to provide insight into the nature of the Nd(3+) ion site and its effect on emission. The degree of discoloration due to solarization by the pump source and its effect on laser performance was investigated as a function of glass composition. Theory was evolved for the design of an 'athermal' laser material based on the hypothesis that thermally induced optical distortion resulting from thermal expansion and associated stress optical effects can be counterbalanced by direct thermally induced index changes if proper glass composition and cavity design are chosen. Descriptions are given of tbe measuring techniques, which are unique in many cases, for determining coefficients of the above temperature and pressure effects as a function of glass composition. Several compositions showed theoretically predicted and experimentally verified marked improvement over our commercial laser material.

Descriptors :   *THERMAL STRESSES, *LASER MATERIALS, *DISCOLORATION, LASER CAVITIES, MEASUREMENT, OPTICAL PROPERTIES, FLUORESCENCE, GLASS, IMPURITIES, IRON, THERMAL EXPANSION, HYPOTHESES, PUMPS, HEAT, DISTORTION, ABSORPTION COEFFICIENTS, NEODYMIUM LASERS, SOLARIZATION.

Subject Categories : Lasers and Masers
      Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE