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Proceedings Paper

CVD-grown diamond: a new material for high-power CO2 lasers
Author(s): Mathieu Massart; Piet Union; G. A. Scarsbrook; Ricardo S. Sussmann; Peter F. Muys
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Paper Abstract

In CO2 laser engineering, combining high output power with low distortion of the laser beam is an ongoing challenge, leading to a search for optics with low absorption and high thermal conductivity. As CVD diamond has recently become available in larger sizes and with better surface quality, this material can now be assessed for use in high power CO2 laser optics. This paper presents the systematic study of diamond as a substrate material for optics at 10.6 microns. CO2-laser calorimetry has been used for the measurement of absorption of laser power in uncoated and antireflection coated diamond optics. The bulk absorption coefficient of natural and CVD diamond is more than a magnitude higher than that of ZnSe, however, a laser window needs to be antireflection coated, and this (together with the ability to use thinner windows of diamond because of its greater strength) reduces the increase in overall absorption for the window to about a factor of three (or approximately 7%). In high power applications this is more than compensated for by the substantially higher thermal conductivity of diamond. Laser induced damage threshold measurements have been made on antireflection coated diamond optics. These measurements have been performed using a TEA CO2-laser with a peak pulse width of 150 ns at 10.6 microns, and the results are reported here.

Paper Details

Date Published: 27 May 1996
PDF: 8 pages
Proc. SPIE 2714, 27th Annual Boulder Damage Symposium: Laser-Induced Damage in Optical Materials: 1995, (27 May 1996); doi: 10.1117/12.240393
Show Author Affiliations
Mathieu Massart, Radius Engineering N.V. (Belgium)
Piet Union, Radius Engineering N.V. (Belgium)
G. A. Scarsbrook, De Beers Industrial Diamond Div. Ltd. (United Kingdom)
Ricardo S. Sussmann, De Beers Industrial Diamond Div. Ltd. (United Kingdom)
Peter F. Muys, Radius Engineering N.V. (Belgium)

Published in SPIE Proceedings Vol. 2714:
27th Annual Boulder Damage Symposium: Laser-Induced Damage in Optical Materials: 1995
Harold E. Bennett; Arthur H. Guenther; Mark R. Kozlowski; Brian Emerson Newnam; M. J. Soileau, Editor(s)

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