15 February 2006 Uniform polymer-film formation in hollow fiber by closed loop-coating method
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A closed loop-coating method has been proposed in order to form a uniform polymer layer in the fabrication of cyclic olefin polymer-coated silver (COP/Ag) hollow optical fiber. A COP solution was flowed in a closed loop system, in which silver-coated tube was used as a part of it. Owing to the constant flowing speed of the solution and the airtight flowing environment, a uniform COP layer was formed, which is one of the most important parameters to improve the transmission properties of the hollow fiber. The method was successfully applied to the fabrication of hollow fibers with 2 meters length for near and mid-infrared lasers, such as Nd:YAG, Er:YAG and CO2 lasers. Stable fabrication and better reproduction were also observed by using the new coating method.
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Katsumasa Iwai, Katsumasa Iwai, Mitsunobu Miyagi, Mitsunobu Miyagi, Yi-Wei Shi, Yi-Wei Shi, Yuji Matsuura, Yuji Matsuura, "Uniform polymer-film formation in hollow fiber by closed loop-coating method", Proc. SPIE 6083, Optical Fibers and Sensors for Medical Diagnostics and Treatment Applications VI, 60830J (15 February 2006); doi: 10.1117/12.649404; https://doi.org/10.1117/12.649404

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