Development of Infrared Optical Fibers with Rugged Distal End for Endoscope

2016 Fiscal Year Final Research Report

• Project/Area Number: 26420327
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Electron device/Electronic equipment
• Research Institution: Sendai National College of Technology
• Principal Investigator: TAKAKU Hiroyuki 仙台高等専門学校, 総合工学科, 研究員 (20705016)
• Research Collaborator: MIYAGI Mitsunobu
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: 中空ファイバ / 赤外レーザ光 / 先端機能デバイス / レーザ治療

Outline of Final Research Achievements

A silica glass capillary is used as the substrate and vitreous film is firstly coated on the inner surface of the capillary to protect the glass tube from moisture. This protective coating keeps the thin-wall glass tube away from damage due to the following silver plating process. The additional transmission loss caused by the roughness of the protective film is decreased by limiting the length of the protective film. The whole length of 0.7-mm-bore hollow fiber was 1.2 m and the length of the rugged part which formed the protective film was only 30 cm. Transmission properties of the rugged polymer-coated silver hollow fibers for the Er:YAG laser and red pilot beam delivery have been improved. The loss for the 0.7-μm-bore size, 1.2-m-length rugged polymer-coated silver hollow fiber was 1 dB and 6.9 dB under straight condition, and 1.9 dB and 9.4 dB under the condition of a 270 degree bend with a 15-mm bending radius at the wavelength of 2.94 μm and 650 nm, respectively.

Free Research Field

光伝送工学