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Fabrication of 75-μm-bore hollow optical fibers for infrared transmission
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Paper Abstract

Extremely flexible hollow optical fibers with 75-μm-bore size were developed for infrared laser light delivery. The hollow fiber was inner coated with silver and dielectric layers to enhance the reflection rate at an objective wavelength band. The silver layer was inner-coated by using the conventional silver mirror-plating technique. Concerning the fabrication parameters used up to now for 320-μm-bore size fibers, the target flowing rate for plating solutions was 10 ml/min. Parallel arranged bundles of silica capillaries were used to increase the cross-sectional area of the air core. To achieve the flow-rate target, four bundles of 300 pieces of silica capillaries with an inner/outer diameter of 75/150-μm and a length of 20 cm were bundled. To increase the flow rate, four bundles with an inner diameter of 75-μm and a length of 20 cm, together with three silica capillaries with an inner diameter of 530-μm and a length of 50 cm were connected in parallel. The spectrum loss measured by an optical spectrum analyzer for the 75-μm-bore size, 10-cm-length silver hollow optical fiber was around 5 dB at the wavelength of 1-μm. Thin dielectric layer was formed by using liquid-phase coating method for low-loss transmission of Er:YAG laser light.

Paper Details

Date Published: 27 February 2019
PDF: 8 pages
Proc. SPIE 10872, Optical Fibers and Sensors for Medical Diagnostics and Treatment Applications XIX, 108720J (27 February 2019); doi: 10.1117/12.2507432
Show Author Affiliations
Katsumasa Iwai, National Institute of Technology, Sendai College (Japan)
Yasuhiro Sasaki, National Institute of Technology, Sendai College (Japan)
Hiroyuki Takaku, National Institute of Technology, Sendai College (Japan)
Mitsunobu Miyagi, Miyagi Gakuin Women's Univ. (Japan)
Yi-Wei Shi, Fudan Univ. (China)
Xiao-Song Zhu, Fudan Univ. (China)
Yuji Matsuura, Tohoku Univ. (Japan)


Published in SPIE Proceedings Vol. 10872:
Optical Fibers and Sensors for Medical Diagnostics and Treatment Applications XIX
Israel Gannot, Editor(s)

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