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Proceedings Paper

FT-IR based loss-spectrum measuring system for infrared hollow waveguides
Author(s): Cong-Hui Yang; Hua Hua; Wei Tan; Yi-Wei Shi; Katsumasa Iwai; Mitsunobu Miyagi
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Paper Abstract

A loss-spectrum measuring-system for hollow waveguides was established based on the Fourier Transform infrared Spectrometer (FTIR). In order to obtain better repeatability, we designed and fabricated two couplers for the system. One is a silver-coated hollow tube with the same inner diameter as the measured hollow waveguide. The other is a silver-coated tapered coupler whose inner diameter of the output end is the same as the measured hollow waveguide. Characteristics of the measuring system were discussed theoretically and experimentally when using the two couplers. Several kinds of hollow waveguides were measured and the properties of the loss spectra were discussed. The measured loss property showed that loss property depends on the output divergence angle of the coupler. Tapered coupler has a much larger output divergence than that of the hollow tube. Both of the couplers attains stable coupling with the hollow waveguides. Loss spectra were successfully measured for hollow waveguides with the length ranging from several centimeters to 3 meters.

Paper Details

Date Published: 24 February 2010
PDF: 8 pages
Proc. SPIE 7559, Optical Fibers and Sensors for Medical Diagnostics and Treatment Applications X, 75590R (24 February 2010); doi: 10.1117/12.841916
Show Author Affiliations
Cong-Hui Yang, Fudan Univ. (China)
Hua Hua, Fudan Univ. (China)
Wei Tan, Fudan Univ. (China)
Yi-Wei Shi, Fudan Univ. (China)
Katsumasa Iwai, Sendai National College of Technology (Japan)
Mitsunobu Miyagi, Sendai National College of Technology (Japan)

Published in SPIE Proceedings Vol. 7559:
Optical Fibers and Sensors for Medical Diagnostics and Treatment Applications X
Israel Gannot, Editor(s)

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