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Proceedings Paper

High temperature heat source generation with a very low power level quasi-cw(continuous wave) semiconductor laser for medical use
Author(s): Takahiro Fujimoto M.D.; Yusuke Imai; Kazuyoku Tei; Tomoo Fujioka; Shigeru Yamaguchi
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Paper Abstract

In most of medical and dental laser treatments, high power pulsed laser have been used as desirable light sources employing with an optical fiber delivery system. The treatment process involves high temperature thermal effect associated with direct laser absorption of the materials such as hard and soft tissues, tooth, bones and so on. Such treatments sometimes face technical difficulties suffering from their optical absorption properties. We investigate a new technology to create high temperature heat source on the tip surface of the glass fiber proposed for the medical surgery applications. Using a low power level (4~6W) semiconductor laser at a wavelength of 980nm, a laser coupled fiber tip was pre-processed to contain certain amount of TiO2 powder with a depth of 400μm from the tip surface so that the irradiated low laser energy could be perfectly absorbed to be transferred to thermal energy. Thus the laser treatment can be performed without suffering from any optical characteristic of the material. Semiconductor laser was operated quasi-CW mode pulse time duration of 180ms and more than 95% of the laser energy was converted to thermal energy in the fiber tip. by Based on twocolor thermometry by using a gated optical multichannel analyzer with 0.25m spectrometer in visible wavelength region, the temperature of the fiber tip was analyzed. The temperature of the heat source was measured to be approximately 3000K. Demonstration of laser processing employing this system was successfully carried out drilling through holes in ceramic materials simulating bone surgery.

Paper Details

Date Published: 8 March 2013
PDF: 10 pages
Proc. SPIE 8565, Photonic Therapeutics and Diagnostics IX, 856569 (8 March 2013); doi: 10.1117/12.2002723
Show Author Affiliations
Takahiro Fujimoto M.D., Clinic F Laser & Skin Ctr. (Japan)
Tokai Univ. (Japan)
Yusuke Imai, Tokai Univ. (Japan)
Kazuyoku Tei, Tokai Univ. (Japan)
Tomoo Fujioka, Tokai Univ. (Japan)
Shigeru Yamaguchi, Tokai Univ. (Japan)

Published in SPIE Proceedings Vol. 8565:
Photonic Therapeutics and Diagnostics IX
Andreas Mandelis; Brian Jet-Fei Wong; Anita Mahadevan-Jansen; Henry Hirschberg M.D.; Hyun Wook Kang; Nikiforos Kollias; Melissa J. Suter; Kenton W. Gregory M.D.; Guillermo J. Tearney M.D.; Stephen Lam; Bernard Choi; Steen J. Madsen; Bodo E. Knudsen M.D.; E. Duco Jansen; Justus F. Ilgner M.D.; Haishan Zeng; Matthew Brenner; Laura Marcu, Editor(s)

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