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Proceedings Paper

Laser densification of optical films
Author(s): Brian D. Fabes; Brian J.J. Zelinski; Douglas J. Taylor; Lori Weisenbach; Sajiv Boggavarapu; David Z. Dent
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Paper Abstract

Sol-gel derived SiO2-TiO2 and WO3 films were densified with a CO2 laser. Laser fired SiO2-TiO2 films had higher optical loss (6 dB/cm) than similar films fired in a furnace (< 1 dB/cm). For coating shrinkages up to about 40% the increase in refractive index during firing was similar for both laser and furnace fired SiO2-TiO2 coatings. At higher shrinkages both anatase and rutile were observed in the laser fired coatings. Loss measurements of laser fired samples in this and, likely, in previous studies were made in crystalline coatings. It is proposed that this, at least in part, is the cause of the high optical losses typically measured in laser densified silica-titania waveguides. The electrochromic coloring behavior of the WO3 films was examined using proton insertion. The coloring characteristics (< 20 s for 90% coloring) and bleaching characteristics (< 3 s for 90% bleaching) of laser fired WO3 films were comparable to the coloring and bleaching characteristics of high-quality sol-gel derived films fired in a furnace. Optimal coloring was obtained using moderate laser energy densities (approximately 50 - 100 J/cm2). This optimum occurred with less shrinkage than for furnace fired electrochromic films with similar coloring behavior.

Paper Details

Date Published: 7 December 1992
PDF: 8 pages
Proc. SPIE 1758, Sol-Gel Optics II, (7 December 1992); doi: 10.1117/12.132016
Show Author Affiliations
Brian D. Fabes, Univ. of Arizona (United States)
Brian J.J. Zelinski, Univ. of Arizona (United States)
Douglas J. Taylor, Univ. of Arizona (United States)
Lori Weisenbach, Univ. of Arizona (United States)
Sajiv Boggavarapu, Univ. of Arizona (United States)
David Z. Dent, Univ. of Arizona (United States)

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

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