Grant-in-Aid for international Scientific Research
|Allocation Type||Single-year Grants|
|Research Institution||Tohoku University|
MIYAGI Mitsunobu Tohoku University, Graduate School of Eng., Professor, 大学院・工学研究科, 教授 (90006263)
ABE Yukio Tohoku Univ., Graduate School of Eng., JSPS Research fellow, 大学院・工学研究科・日本学術振興会, 特別研究員
CHO Shuken Wnham Institute of Technology, Res.Inst.New Materials, Professor, 新材料研究所, 教授
石 芸尉 東北大学, 電気通信研究所, 講師(中核的研究機関
SATO Shunichi National Defonse Medical College, Biomedical Inf.Science, Assoc.Professor, 防衛医学研究センター, 助教授
MATSUURA Yuji Graduate School of Eng., Assoc.Professor, 工学研究科, 助教授 (10241530)
SHI Yi-Wei Res.Inst.of Elect.Commun., Lecturer
ギャノー I テルアビブ大学, 生化学工学科, 助教授
王 ゆう 東北大学, 大学院・工学研究科, 助手 (90292234)
|Project Period (FY)
1997 – 1998
Completed(Fiscal Year 1998)
|Budget Amount *help
¥6,900,000 (Direct Cost : ¥6,900,000)
Fiscal Year 1998 : ¥3,800,000 (Direct Cost : ¥3,800,000)
Fiscal Year 1997 : ¥3,100,000 (Direct Cost : ¥3,100,000)
|Keywords||Infrared laser / Hollow waveguide / Infrared fiber / Medical laser / Laser treatment / Dielectric-coated hollow waveguide|
The purpose of this project is to realize highly efficient and intelligent delivery system for the infrared light with high energy or high power. Main results of this project are as follows :
1. International conference to promote biomedical optics
4 international meetings were held with collaborators in this project in BiOS Europe '97, BiOS '98, BiOS Europe '98 and BiOS '99 fibers. The continuous progress in the area of infrared delivery system in the biophotonics have been made.
2. Measurements of optical constants of polymers in the infrared
A method of simultaneous measurements of the refractive index and extinction
coefficient of thin polymer has been developed in the visible, near-infrared, and infrared wavelength regions. Based on this method, optical characteristics of many engineering plastics have been clarified.
3. Loss reduction of polymer-coated hollow waveguides
It is firstly clarified that the solvent of polymer, concentration of polymer solution, and the coating speed are the key factors to reduce the waveguide losses. 2 m-long waveguides with inner diameters of 0.54-1.0 mm have been successfully fabricated.
4. Fabrication of lensed taper coupler
Lnsed taper couplers have been proposed and fabricated to increase the alignment tolerance and loss reduction of them has been made.
5. Fabrication of hollow waveguides transmitting multiple infrared light
By choosing the thickness of polymer layer to be coated inside hollow silver tube, multiple infared light as well as aiming light of red or green color has been
successfully transmitted with small losses.
6. Sealing of hollow waveguides
A simple technique has been proposed to seal the ends of hollow waveguides. It is clarified that there exits an optimum thickness of sealing film to maximize the power capability of hollow waveguides without any damage of the sealing.