THE USE OF A LASER AS A LIGHT SOURCE FOR PHOTOGRAPHIC LIGHT SCATTERING FROM POLYMER FILMS
Abstract
A light-weight portable self-contained laser and power supply which produces a 0.1 joule plane polarized pulse having wavelength 6943A from a 90 degree cut 2 in. x 1/4 in. ruby crystal excited by a 400 joule pulse from two xenon flash lamps was used as a light source for this study. A V sub v polariz d scatteri g pattern from a mil thick medium density polyethylene film obtained with a single fl sh of the laser of duration about 500 micron sec is compared with a similar picture for the s me sample requiring a 4.5 hour exposure with conventional apparatus. The laser pattern is somewhat larger in size because of the longer wavelength. Pictures were obtained in single flashes equivalent to 4 day conventional exposures. It is possible by taking a number of pictures in succession of follow time dependent processes such as crystalliz tion rates, orientation relaxation, annealing and changes accompanying dynamic strain. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1970
- Accession Number
- AD0293290
Entities
People
- Daniel A. Keedy
- Marion B. Rhodes
- Richard S. Stein
Organizations
- University of Massachusetts Amherst