UNSPECIFIED (1998) Periodically poled Cs-exchanged RbTiOAsO4 optical waveguides: High-resolution x-ray diffraction, scattering, and topography study. PHYSICAL REVIEW B, 58 (10). pp. 6074-6080. ISSN 1098-0121

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Abstract

A crystal of periodically poled RbTiOAsO4, in which optical channel waveguides have been produced by Cs ion exchange, has been studied using combined optical and x-ray diffraction imaging, reciprocal-space mapping, and diffuse scattering. The lattice strains which result from the uptake of Cs in periodically poled RbTiOAsO4 are determined and are found to be Delta c/c = +0.02%-0.04% for different orientations of the sample in the (00 (1) over bar) plane, Delta b/b=-0.02% and Delta a/a congruent to 0%, to within the resolution of reciprocal-space measurement. The detailed microstructural features of the periodically domain-inverted structure and the modulation of the Cs uptake in the ion-exchanged regions are shown directly in x-ray diffraction images from the (00 (1) over bar) surface. Evidence of defect clusters, formed during the ion-exchange processing and of size approximately 180 nm, is presented from analysis of the x-ray diffuse scattering around the Bragg peaks from the ion-exchanged layer and substrate. Discussions of the domain-inversion and ion-exchange processing and the consequences for the microstructure of the waveguiding layer and its properties are given in terms of our observations.

Item Type:	Journal Article
Subjects:	Q Science > QC Physics
Journal or Publication Title:	PHYSICAL REVIEW B
Publisher:	AMER PHYSICAL SOC
ISSN:	1098-0121
Date:	1 September 1998
Volume:	58
Number:	10
Number of Pages:	7
Page Range:	pp. 6074-6080
Publication Status:	Published
URI:	http://wrap.warwick.ac.uk/id/eprint/15338

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