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Proceedings Paper

Laser Raman measurements of dielectric coatings as a function of temperature
Author(s): Gregory J. Exarhos; Nancy J. Hess; Samantha Ryan
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Paper Abstract

Single crystal Raman spectra of the anatase phase of titania have been acquired as a simultaneous function of temperature and pressure in a heated diamond anvil cell. Measured data are used to construct frequency contours in P space for particular allowed vibrational modes. The magnitude of stress in thin films deposited on various substrates and its temperature evolution have been evaluated from correlations between the P frequency maps and measured temperature-dependent mode frequencies exhibited by the films. A simple anharmonic oscillator model has been used to relate the temperature-dependence of the square of the mode frequency to the first order aiiharmonic contribution to the potential energy from which the thermal expansion coefficient (a) of polycrystalline films may be estimated. The stress dependence of a for bulk titania has been determined from this data and is compared with the predicted response of several stressed titania films. 1.

Paper Details

Date Published: 1 June 1991
PDF: 10 pages
Proc. SPIE 1441, Laser-Induced Damage in Optical Materials: 1990, (1 June 1991); doi: 10.1117/12.27529
Show Author Affiliations
Gregory J. Exarhos, Pacific Northwest Lab. (United States)
Nancy J. Hess, Pacific Northwest Lab. (United States)
Samantha Ryan, Univ. of Washington (United States)

Published in SPIE Proceedings Vol. 1441:
Laser-Induced Damage in Optical Materials: 1990
Harold E. Bennett; Lloyd L. Chase; Arthur H. Guenther; Brian Emerson Newnam; M. J. Soileau, Editor(s)

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