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Proceedings Paper

Observation of self-channeling and modification in optical fibers using a high-intensity femtosecond laser
Author(s): Sung-Hak Cho; Hiroshi Kumagai; Isao Yokota; Katsumi Midorikawa; Minoru Obara
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Paper Abstract

We report the first experimental observation of laser-induced self-channeled plasma formation and bulk modification in multimode optical fibers during excitation by a high-intensity (above 1011 W/cm2) femtosecond (110fs) Ti:sapphire laser. The solid-density plasma formation at various input intensities and the corresponding variation of anti-Stokes spectra were observed simultaneously. The threshold for plasma formation in the optical fiber was found to be 8 X 1011 W/cm2. When the input intensity exceeded 1.5 X 1012 W/cm2, self-channeled plasma formation was observed with a length of 9 - 10 mm from the input end of an optical fiber. It was observed that the bulk modification, after 5 minutes of irradiation at 1.7 X 1012 W/cm2, resulted in a 5 micrometer diameter and approximately 6 mm length, in two types of multimode optical fiber with core/cladding diameters of 100/110 micrometer and 200/220 micrometer.

Paper Details

Date Published: 14 September 1998
PDF: 8 pages
Proc. SPIE 3343, High-Power Laser Ablation, (14 September 1998); doi: 10.1117/12.321532
Show Author Affiliations
Sung-Hak Cho, Keio Univ. (Japan)
Hiroshi Kumagai, RIKEN--The Institute of Physical and Chemical Research (Japan)
Isao Yokota, Keio Univ. (Japan)
Katsumi Midorikawa, RIKEN--The Institute of Physical and Chemical Research (Japan)
Minoru Obara, Keio Univ. (Japan)

Published in SPIE Proceedings Vol. 3343:
High-Power Laser Ablation
Claude R. Phipps, Editor(s)

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