High temperature heat source generation with quasi-continuous wave semiconductor lasers at power levels of 6 W for medical use.
We investigate a technology to create a high temperature heat source on the tip surface of the glass fiber proposed for medical surgery applications. Using 4 to 6 W power level semiconductor lasers at a wavelength of 980 nm, a laser coupled fiber tip was preprocessed to contain a certain amount of titanium oxide powder with a depth of 100 μm 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. A semiconductor laser was operated quasi-continuous wave mode pulse time duration of 180 ms and >95% of the laser energy was converted to thermal energy in the fiber tip. Based on two-color thermometry, by using a gated optical multichannel analyzer with a 0.25 m spectrometer in visible wavelength region, the temperature of the fiber tip was analyzed. The temperature of the heat source was measured to be in excess 3100 K.
Clinic F, 6-6-1-4F Koujimachi, Chiyoda-ku, Tokyo 102-0083, JapanbTokai University, Faculty of Science and Technology, Kitakaname 4-1-1, Hiratsuka, Kanagawa 259-1292, JapandKeio University, Division of Physical Pharmaceutical Chemistry Faculty of Pharmacy.
Takahiro
T
Fujimoto
Tokai University, Faculty of Science and Technology, Kitakaname 4-1-1, Hiratsuka, Kanagawa 259-1292, Japan.
Yusuke
Y
Imai
Tokai University, Faculty of Science and Technology, Kitakaname 4-1-1, Hiratsuka, Kanagawa 259-1292, Japan.
Kazuyoku
K
Tei
I.T.O. Co. Ltd., 1-6-7-3F Naka-cho, Musashino-shi, Tokyo 180-0006, JapandKeio University, Division of Physical Pharmaceutical Chemistry Faculty of Pharmacy, 1-5-30 Shibakoen, Minato-ku, Tokyo 105-8512, Japan.
Shinobu
S
Ito
Keio University, Division of Physical Pharmaceutical Chemistry Faculty of Pharmacy, 1-5-30 Shibakoen, Minato-ku, Tokyo 105-8512, Japan.
Hideko
H
Kanazawa
Tokai University, Faculty of Science and Technology, Kitakaname 4-1-1, Hiratsuka, Kanagawa 259-1292, Japan.
Shigeru
S
Yamaguchi
D004735:Energy Transfer; D004867:Equipment Design; D019544:Equipment Failure Analysis; D006979:Hyperthermia, Induced / Q000295:instrumentation*; D053685:Laser Therapy / Q000295:instrumentation*; D054023:Lasers, Semiconductor; D013696:Temperature