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Proceedings Paper

Modification in optical fibers using high-intensity femtosecond lasers
Author(s): Sung-Hak Cho; Hiroshi Kumagai; Katsumi Midorikawa; Minoru Obara
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Paper Abstract

Refractive index modification in optical multimode fibers was firstly demonstrated, as a fabrication method of double cladding structure, using plasma channeling excited by a high intensity femtosecond Ti:Sapphire laser. The induced refractive index modification in a pure silica multimode fiber with 100/110 micrometers core/cladding diameter was reached to the length of approximately 9-10 mm from the end of optical fiber with the diameters ranging form 5 to 8 micrometers at more than input intensity of 1.5 X 1012 W/cm2. It had graded refractive index profile that was a symmetric form from the center of a multimode fiber and the maximum values of refractive index change was 1.6 X 10-2. According to the ESR spectroscopic measurement, it was observed that the concentration of defect of SiE center was heavily increased in refractive index modification refer to that of non-modification region. It was suggested that the defect was induced by the multiphoton absorption process through plasma channeling. Near-field pattern and beam intensity profile of a modified multimode fiber showed that bulk modification played a role as a double cladding structure. The fabrication method of double cladding structure in the end of multimode fiber can be useful tool for mode converter and single-mode connector in the fields of optical communication and optical sensor.

Paper Details

Date Published: 15 July 1999
PDF: 9 pages
Proc. SPIE 3618, Laser Applications in Microelectronic and Optoelectronic Manufacturing IV, (15 July 1999); doi: 10.1117/12.352680
Show Author Affiliations
Sung-Hak Cho, Keio Univ. and RIKEN-Institute of Physical and Chemical Research (Japan)
Hiroshi Kumagai, RIKEN-Institute of Physical and Chemical Research (Japan)
Katsumi Midorikawa, RIKEN-Institute of Physical and Chemical Research (Japan)
Minoru Obara, Keio Univ. and RIKEN-Institute of Physical and Chemical Research (Japan)


Published in SPIE Proceedings Vol. 3618:
Laser Applications in Microelectronic and Optoelectronic Manufacturing IV
Jan J. Dubowski; Henry Helvajian; Ernst-Wolfgang Kreutz; Koji Sugioka, Editor(s)

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