High temperature heat source generation with a very low power level quasi-cw(continuous wave) semiconductor laser for medical use

Takahiro Fujimoto M.D.; Yusuke Imai; Kazuyoku Tei; Tomoo Fujioka; Shigeru Yamaguchi

doi:10.1117/12.2002723

8 March 2013 High temperature heat source generation with a very low power level quasi-cw(continuous wave) semiconductor laser for medical use

Takahiro Fujimoto M.D., Yusuke Imai, Kazuyoku Tei, Tomoo Fujioka, Shigeru Yamaguchi

Author Affiliations +

Proceedings Volume 8565, Photonic Therapeutics and Diagnostics IX; 856569 (2013) https://doi.org/10.1117/12.2002723
Event: SPIE BiOS, 2013, San Francisco, California, United States

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.

Citation Download Citation

Takahiro Fujimoto M.D., Yusuke Imai, Kazuyoku Tei, Tomoo Fujioka, and Shigeru Yamaguchi "High temperature heat source generation with a very low power level quasi-cw(continuous wave) semiconductor laser for medical use", Proc. SPIE 8565, Photonic Therapeutics and Diagnostics IX, 856569 (8 March 2013); https://doi.org/10.1117/12.2002723

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KEYWORDS

Semiconductor lasers

Fiber lasers

Optical fibers

Laser therapeutics

Titanium dioxide

Absorption

Surgery

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