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Proceedings Paper

Characteristics of couplers and grating induced by self-trapped filament of femtosecond laser pulses
Author(s): Wataru Watanabe; Taishi Asano; Kazuhiro Yamada; Junji Nishii; Kazuyoshi Itoh
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Paper Abstract

Permanent refractive-index change can be induced by a self-trapped filament of infrared femtosecond laser pulses in silica glass. We present the fabrication of waveguides, couplers, and gratings by use of the self-trapped filament. The self-trapped filament with 30 μm long was found to bend from the direction of the incident laser pulses by two-dimensional translation. This technique leads to a formation of a permanent curved waveguide. We fabricate a 2-mm long directional coupler with the core diameter of 2 μm to split the coupled beam into 1:1. We also show the fabrication of gratings. Finally, we investigate the dependence of refractive-index change on polarization of incident laser pulses.

Paper Details

Date Published: 19 June 2003
PDF: 7 pages
Proc. SPIE 4978, Commercial and Biomedical Applications of Ultrafast Lasers III, (19 June 2003); doi: 10.1117/12.478584
Show Author Affiliations
Wataru Watanabe, Osaka Univ. (Japan)
Taishi Asano, Osaka Univ. (Japan)
Kazuhiro Yamada, Osaka Univ. (Japan)
Junji Nishii, National Institute of Advanced Industrial Science and Technology (Japan)
Kazuyoshi Itoh, Osaka Univ. (Japan)

Published in SPIE Proceedings Vol. 4978:
Commercial and Biomedical Applications of Ultrafast Lasers III
Joseph Neev; Andreas Ostendorf; Christopher B. Schaffer, Editor(s)

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