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Proceedings Paper

Femtosecond laser processing tailored for biomedical materials and laser power delivery through optical fibers
Author(s): Minoru Obara; Kazue Ozono; Makoto Kanai; Hitoshi Sekita; Peter A. Atanasov
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Paper Abstract

We have been working on the tailored ablation processing of advanced materials using femtosecond lasers. Here we would like to focus on the femtosecond laser processing tailored for hydroxyapatite. Hydroxyapatite is a key material of human tooth and human bone. The human bone is made of hydroxyapatite oriented along the collagen. The micromachining of human bone is highly required for medicine. The medical issue is how to preserve the chemical property of the laser-ablated surface. By use of pulsewidth tunable femtosecond laser (50fs - 2ps, 1.5mJ, 1kpps), we compared the relative content of calcium and phosphorus. The relative content of calcium and phosphorus is kept unchanged before and after laser ablation. For these medical applications, the intense femtosecond laser delivery through optical fibers is required. It is theoretically shown that it is possible to deliver the 900 fs pulses of 0.1 mJ/pulse through a 1 m-lohng graded index fiber with a 200 μm core diameter if the fiber has the optimum refractive index profile. We therefore conclude that graded index multimode fibers give better spatial distributions of the output transverse mode than hollow fibers or step index multimode fibers, and can deliver larger pulse energy than single mode fibers.

Paper Details

Date Published: 17 October 2003
PDF: 13 pages
Proc. SPIE 4977, Photon Processing in Microelectronics and Photonics II, (17 October 2003); doi: 10.1117/12.479575
Show Author Affiliations
Minoru Obara, Keio Univ. (Japan)
Kazue Ozono, Keio Univ. (Japan)
Makoto Kanai, Keio Univ. (Japan)
Hitoshi Sekita, Keio Univ. (Japan)
Cyber Laser Inc. (Japan)
Peter A. Atanasov, Keio Univ. (Japan)
Institute of Electronics (Bulgaria)

Published in SPIE Proceedings Vol. 4977:
Photon Processing in Microelectronics and Photonics II
Alberto Piqué; Koji Sugioka; Peter R. Herman; Jim Fieret; David B. Geohegan; Frank Träger; Kouichi Murakami; Friedrich G. Bachmann; Jan J. Dubowski; Willem Hoving; Kunihiko Washio, Editor(s)

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