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Proceedings Paper

Photo-induced refractive-index changes in filaments formed in glass with femtosecond laser pulses
Author(s): Kazuhiro Yamada; Tadamasa Toma; Wataru Watanabe; Junji Nishii; Kazuyoshi Itoh
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Paper Abstract

Recently, the structural modifications of glass by focusing femtosecond laser pulses have been demonstrated. We present photo-induced structural changes in silica glass with femtosecond laser pulses. We investigated the relationship between the formation of filaments and local refractive index changes in silica glass. In situ observation revealed the coincidence between the location of filament and that of refractive index change. The observation also showed that the region of refractive index change elongates toward the upstream direction of laser pulses with the exposure time. The region of refractive index change was several hundred- micron long and the diameter was smaller than two microns. The length of the region was dependent on the numerical aperture of focusing lenses. The refractive index change was confirmed to be as large as 0.01 by three different methods. We fabricated a 2-mm waveguide by translating the sample along the optical axis.

Paper Details

Date Published: 6 November 2000
PDF: 4 pages
Proc. SPIE 4088, First International Symposium on Laser Precision Microfabrication, (6 November 2000); doi: 10.1117/12.405764
Show Author Affiliations
Kazuhiro Yamada, Osaka Univ. (Japan)
Tadamasa Toma, Osaka Univ. (Japan)
Wataru Watanabe, Osaka Univ. (Japan)
Junji Nishii, Osaka National Research Institute (Japan)
Kazuyoshi Itoh, Osaka Univ. (Japan)

Published in SPIE Proceedings Vol. 4088:
First International Symposium on Laser Precision Microfabrication
Isamu Miyamoto; Koji Sugioka; Thomas W. Sigmon, Editor(s)

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