DETERMINATION OF PULSED CO2 LASER DAMAGE THRESHOLDS OF OPTICAL SURFACES

Authors
  1. Anctil, J-C.
  2. MacPherson, R.W.
Corporate Authors
Defence Research Establishment Valcartier, Valcartier QUE (CAN)
Abstract
An experimental technique is described for determining the damage thresholds of glass and plastic optical material surfaces, opaque to laser radiations, when irradiated with a pulsed TEA-CO2 laser. Use of a probit analysis to estimate the irradiance required for a 50% probability of damage gives threshold levels of 4.0 J/square cm for fused silica, 2.1 J/square cm for soda-lime glass, 2.3 J/square cm for polycarbonate, 2.3 J/square cm for acrylic and 1.7 J/square cm for polystyrene plastics. The significance of the statistical distributions observed in attributing various mechanisms to the damage is discussed. Finally, some improvements are suggested to make the measurements more accurate.
Report Number
DREV-4197/81 —
Date of publication
15 Mar 1981
Number of Pages
42
DSTKIM No
81-02955
CANDIS No
33831
Format(s):
Originator's fiche received by DSIS;Hardcopy

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