Accession Number : AD0666918

Title :   INVESTIGATION OF CRYSTAL IMPERFECTIONS BY MEANS OF LASER LIGHT SCATTERING.

Descriptive Note : Physical sciences research papers no. 351,

Corporate Author : AIR FORCE CAMBRIDGE RESEARCH LABS L G HANSCOM FIELD MASS

Personal Author(s) : Powell,Richard C.

Report Date : DEC 1967

Pagination or Media Count : 66

Abstract : The use of light scattering as a method for studying imperfections in crystals is discussed. A unique apparatus using a laser as a light source for ultramicroscopy and angular scattering experiments is described. The results obtained utilizing this apparatus for investigations of imperfections in ruby crystals are presented and discussed. These investigations were done as a function of crystal growth direction, annealing, boule morphology, polarization, chromium concentration, gamma-irradiation, and temperature. The results of this work demonstrate the usefulness of this new equipment as a convenient, nondestructive technique for characterizing imperfections in crystals of relatively large size. They also indicate the existence of both randomly distributed scatterers and oriented scattering regions in ruby crystals and show how these scattering centers are altered by changes in the various parameters studied in this investigation. (Author)

Descriptors :   (*NONDESTRUCTIVE TESTING, CRYSTAL DEFECTS), (*CRYSTAL DEFECTS, LIGHT TRANSMISSION), RUBY, COHERENT RADIATION, LASERS, SCATTERING, CRYSTAL GROWTH, ANNEALING, POLARIZATION, NUCLEAR RADIATION, INTERACTIONS, DISLOCATIONS

Subject Categories : Lasers and Masers
      Test Facilities, Equipment and Methods
      Crystallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE