FT-IR based loss-spectrum measuring system for infrared hollow waveguides

Cong-Hui Yang; Hua Hua; Wei Tan; Yi-Wei Shi; Katsumasa Iwai; Mitsunobu Miyagi

doi:10.1117/12.841916

24 February 2010 FT-IR based loss-spectrum measuring system for infrared hollow waveguides

Cong-Hui Yang, Hua Hua, Wei Tan, Yi-Wei Shi, Katsumasa Iwai, Mitsunobu Miyagi

Proceedings Volume 7559, Optical Fibers and Sensors for Medical Diagnostics and Treatment Applications X; 75590R (2010) https://doi.org/10.1117/12.841916
Event: SPIE BiOS, 2010, San Francisco, California, United States

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.

Citation Download Citation

Cong-Hui Yang, Hua Hua, Wei Tan, Yi-Wei Shi, Katsumasa Iwai, and Mitsunobu Miyagi "FT-IR based loss-spectrum measuring system for infrared hollow waveguides", Proc. SPIE 7559, Optical Fibers and Sensors for Medical Diagnostics and Treatment Applications X, 75590R (24 February 2010); https://doi.org/10.1117/12.841916

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