Observation of self-channeling and modification in optical fibers using a high-intensity femtosecond laser

Sung-Hak Cho; Hiroshi Kumagai; Isao Yokota; Katsumi Midorikawa; Minoru Obara

doi:10.1117/12.321532

14 September 1998 Observation of self-channeling and modification in optical fibers using a high-intensity femtosecond laser

Sung-Hak Cho, Hiroshi Kumagai, Isao Yokota, Katsumi Midorikawa, Minoru Obara

Author Affiliations +

Proceedings Volume 3343, High-Power Laser Ablation; (1998) https://doi.org/10.1117/12.321532
Event: High-Power Laser Ablation, 1998, Santa Fe, NM, United States

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.

Citation Download Citation

Sung-Hak Cho, Hiroshi Kumagai, Isao Yokota, Katsumi Midorikawa, and Minoru Obara "Observation of self-channeling and modification in optical fibers using a high-intensity femtosecond laser", Proc. SPIE 3343, High-Power Laser Ablation, (14 September 1998); https://doi.org/10.1117/12.321532

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