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Proceedings Paper

GRIN optics with transition elements in gel-silica matrices
Author(s): James M. Kunetz; Jon K. West; Larry L. Hench
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Paper Abstract

Sol-gel technology is providing a viable alternative path towards developing doped optical components via impregnation of Type VI gel silica using a vapor or liquid phase. Past work presented an optical technique for determining quantitative mass transport properties of Cr3+ ions within the water filled porous phase of Type VI silica. Ion influx is measured by integrating the strong absorption bands produced by the chromium in the visible region. Diffusion coefficients are determined for an array of pore properties (radius, volume, surface area) as well as solution concentrations. Diffusion coefficients are calculated to be 2.0 X 10-8 cm2/sec for the most restricted case and approach 1.6 X 10-6 cm2/sec, the bulk liquid diffusion coefficient, as the ratio of diffusing solute diameter to the pore diameter decreases. Final chromium distributions are determined using electron microprobe x-ray. Higher chromium distributions are found on surfaces of the gels from which solvent is restricted from evaporating. Sample geometries affect the percent change of concentration across the cross-section.

Paper Details

Date Published: 7 December 1992
PDF: 7 pages
Proc. SPIE 1758, Sol-Gel Optics II, (7 December 1992); doi: 10.1117/12.132012
Show Author Affiliations
James M. Kunetz, Univ. of Florida (United States)
Jon K. West, Univ. of Florida (United States)
Larry L. Hench, Univ. of Florida (United States)

Published in SPIE Proceedings Vol. 1758:
Sol-Gel Optics II
John D. Mackenzie, Editor(s)

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