Accession Number:

AD0729939

Title:

The Study of the Interaction of Intense Picosecond Light Pulse with Materials. Berg-Barrett X-Ray Observation of Annealing and Laser Induced Damage in Zinc

Descriptive Note:

Quarterly technical rept. 22 Mar-21 Jun 1971

Corporate Author:

MARYLAND UNIV COLLEGE PARK DEPT OF ELECTRICAL ENGINEERING

Report Date:

1971-07-21

Pagination or Media Count:

26.0

Abstract:

The Berg-Barrett x-ray diffraction contrast technique has been utilized to study the process of laser induced damage in a zinc crystal and, also to make observations on the annealing characteristics of the dislocation substructure before and after the laser treatment. Annealing caused individual dislocations to become segmented with various sections of their line lengths becoming parallel to 1010. This preference for a crystallographic orientation of the dislocations seemed related to the equally important observation that the subboundary lineage structure of the crystals was also largely composed of tilt boundaries of 1010 and 1120 surfaces. The laser induced damage required a threshold energy which caused melting, possible vaporization and appreciable plastic deformation of the matrix material by deformation winning, non-basal slip and micro-kinking. By comparison with the structural rearrangement observed in the pre-annealed specimen, the laser damage zone showed only very retarded changes.

Subject Categories:

  • Optics
  • Solid State Physics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE