Fabrication of 800-μm-bore hollow optical fibers based on completely non-fragile and flexible Ni-Ti tube for the infrared

Katsumasa Iwai; Hiroyuki Takaku; Mitsunobu Miyagi; Yi-Wei Shi; Xiao-Song Zhu; Yuji Matsuura

doi:10.1117/12.2576477

5 March 2021 Fabrication of 800-μm-bore hollow optical fibers based on completely non-fragile and flexible Ni-Ti tube for the infrared

Katsumasa Iwai, Hiroyuki Takaku, Mitsunobu Miyagi, Yi-Wei Shi, Xiao-Song Zhu, Yuji Matsuura

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Proceedings Volume 11635, Optical Fibers and Sensors for Medical Diagnostics, Treatment and Environmental Applications XXI; 116350L (2021) https://doi.org/10.1117/12.2576477
Event: SPIE BiOS, 2021, Online Only

Abstract

Ni-Ti tube is used as a supporting tube for the infrared hollow fiber to obtain flexibility and strong mechanical strength. The loss of Hollow optical fiber is inversely proportional to the cube of the inner diameter. Considering this, it is expected that the large-diameter hollow optical fiber has a low loss. Even with a large inner diameter of 800 μm, the Ni-Ti tube with a wall thickness of 0.1 mm can be bent with a small force to a bending radius of 15 mm. Therefore, 800-μm-bore hollow optical fiber based on Ni-Ti tube was fabricated. In order to reduce roughness of inner surface of Ni-Ti tube which causes the additional transmission loss, an acrylic-silicon resin material is used as a buffer layer to the inner wall of Ni-Ti tube for a low-loss characteristic. For the dielectric inner-coating layer, cyclic olefin polymer (COP) is used to lower the transmission loss. The COP layer is formed by using liquid-phase coating method. The hollow fibers with optimized COP inner film thickness for CO₂ laser light were fabricated and reasonable transmission losses was demonstrated.

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Katsumasa Iwai, Hiroyuki Takaku, Mitsunobu Miyagi, Yi-Wei Shi, Xiao-Song Zhu, and Yuji Matsuura "Fabrication of 800-μm-bore hollow optical fibers based on completely non-fragile and flexible Ni-Ti tube for the infrared", Proc. SPIE 11635, Optical Fibers and Sensors for Medical Diagnostics, Treatment and Environmental Applications XXI, 116350L (5 March 2021); https://doi.org/10.1117/12.2576477

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