HOLOGRAPHIC INTERFEROMETER FOR MEASUREMENT OF PLASMA DENSITIES

Authors
  1. Chevrette, P.
  2. MacPherson, R.W.
  3. Ethier, C.
Corporate Authors
Defence Research Establishment Valcartier, Valcartier QUE (CAN)
Abstract
A portable holographic interferometer produces interferograms of laser induced plasmas under conditions which would normally prohibit the use of conventional interferometers. The interferograms are made with a pulsed ruby laser and may be reconstructed with white light. The effects of any emulsion shrinkage that may occur during the development of the holographic plates can be made negligible by either choosing a small angle between the object and reference beam directions or by orienting the normal of the hologram so that it bisects that angle. The sensitivity of the measurements may be increased by introducing background fringes as in conventional interferometry. The timing of the ruby laser pulse with respect to the development of the plasmas under observation is controlled over a range 0.5-10 s, with an accuracy of 10 ns, by means of a simple delay circuit which has been added to the laser's Pockels cell Q-switch control.
Report Number
700/73 —
Date of publication
15 Nov 1973
Number of Pages
37
DSTKIM No
74-01042
CANDIS No
21487
Format(s):
Hardcopy;Originator's fiche received by DSIS

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