High temperature heat source generation with quasi-continuous wave semiconductor lasers at power levels of 6 W for medical use

Takahiro Fujimoto, Yusuke Imai, Kazuyoku Tei, Shinobu Ito, Hideko Kanazawa, Shigeru Yamaguchi

Research output: Contribution to journalArticle


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 ìm 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.

Original languageEnglish
Article number101502
JournalJournal of Biomedical Optics
Issue number10
Publication statusPublished - 2014 Oct



  • glass fiber
  • high temperature generation
  • semiconductor laser

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Atomic and Molecular Physics, and Optics
  • Biomedical Engineering

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