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Laser-Induced Fluorescence in Doped Metal Oxide Planar Waveguides Deposited from Aqueous Solutions

Published online by Cambridge University Press:  15 February 2011

Nancy J. Hess ,
Gregory J. Exarhos  and
Susanne M. Wood
Nancy J. Hess
Affiliation:
Pacific Northwest Laboratory, Richland, Washington 99352
Gregory J. Exarhos
Affiliation:
Pacific Northwest Laboratory, Richland, Washington 99352
Susanne M. Wood
Affiliation:
Shock Dynamics Laboratory, Department of Physics, Washington State University, Pullman, Washington 99164
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Abstract

An aqueous route to the deposition of complex metal oxide films is based upon the complexation of the corresponding metal nitrate salts by glycine, followed by spin-casting the concentrated solution onto silica substrates. The presence of glycine serves to frustrate precipitation and leads to the formation of a glassy matrix through which metal cations are homogeneously dispersed. Subsequent heating of coated substrates initiates an oxidation-reduction reaction which removes the organic matrix and residual nitrate leaving behind a film of the desired oxide composition. Using this method, ruby (Cr:Al2O3) and Sm:YAG (Sm:Y3Al5O12) films on the order of 150 nm thick have been deposited. The respective phases have been confirmed by XRD data and from the measured fluorescence spectra.

The red fluorescence exhibited by these materials under 488 nm excitation is dependent upon the ambient temperature and pressure. A marked shift in wavelength is observed as a function of increasing pressure. Ruby also exhibits a temperature dependent wavelength shift in contrast to Sm:YAG where a negligible shift is seen to temperatures near 1200 K. Fluorescence lifetimes of both materials exhibit a temperature dependence which varies with dopant concentration. This work suggests the possible application of these films as pressure-temperature sensors in a planar waveguide configuration or as a coating material for optical fibers. Details of the deposition process will be reviewed and the fluorescence response of both types of films will be summarized.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 244: Symposium J – Optical Waveguide Materials , 1991 , 281
Copyright
Copyright © Materials Research Society 1992

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References

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