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Proceedings Paper

Fabrication of SiO2/AgI/SiO2/Ag hollow glass fiber for infrared transmission
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Paper Abstract

Transmission characteristics of infrared hollow fiber with multi- AgI and SiO2 films are discussed. Three-dielectric-layer hollow glass fiber with SiO2/AgI/SiO2/Ag structure was fabricated for low-loss delivery of infrared laser light. The first SiO2 film on the silver layer was coated by using liquid phase coating method. A semi-inorganic polymer was used as the coating material. A smooth vitreous film was formed by the treatment of a hardener at room temperature and followed by curing treatment. For the deposition of the AgI film between the two SiO2 films, an Ag film was first plated on the SiO2 film by silver mirror reaction method. Then the iodination process was conducted to turn the silver layer into silver iodide. The second SiO2 layer was deposited on the AgI layer in the same way as the first SiO2 layer. Fabrication parameters for controlling film thicknesses, such as iodination temperature, silver mirror reaction time, and solution concentration, are clarified for depositing AgI and SiO2 films with the theoretical optimum thicknesses. By optimizing the thickness of the three dielectric layers, low-loss in the loss spectrum of SiO2/AgI/SiO2/Ag hollow glass waveguides can be obtained at the target infrared wavelengths. A method is proposed to evaluate the film thickness of AgI layer based on the positions of loss peaks and valleys in the loss spectra. Theoretical calculation for loss spectrum of SiO2/AgI/SiO2/Ag hollow glass fiber considering material dispersion of dielectric materials is also conducted. Good agreement with the measured data is demonstrated.

Paper Details

Date Published: 20 February 2009
PDF: 10 pages
Proc. SPIE 7173, Optical Fibers and Sensors for Medical Diagnostics and Treatment Applications IX, 71730G (20 February 2009); doi: 10.1117/12.807904
Show Author Affiliations
Ke-Rong Sui, Fudan Univ. (China)
Xiao Lin, Fudan Univ. (China)
Xiao-Song Zhu, 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)
Miyagi National College of Technology (China)

Published in SPIE Proceedings Vol. 7173:
Optical Fibers and Sensors for Medical Diagnostics and Treatment Applications IX
Israel Gannot, Editor(s)

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