Transmission properties of 700-μm-bore hollow optical fibers based on flexible Ni-Ti tube

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

doi:10.1117/12.2605723

2 March 2022 Transmission properties of 700-μm-bore hollow optical fibers based on flexible Ni-Ti tube

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

Proceedings Volume 11953, Optical Fibers and Sensors for Medical Diagnostics, Treatment and Environmental Applications XXII; 1195303 (2022) https://doi.org/10.1117/12.2605723
Event: SPIE BiOS, 2022, San Francisco, California, United States

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 700 μm, the Ni-Ti tube with a wall thickness of 75 μm can be bent easily to a bending radius as small as 15 mm. Therefore, 700-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 were demonstrated.

Conference Presentation

Citation Download Citation

Katsumasa Iwai, Hiroyuki Takaku, Mitsunobu Miyagi, Yi-Wei Shi, Xiao-Song Zhu, and Yuji Matsuura "Transmission properties of 700-μm-bore hollow optical fibers based on flexible Ni-Ti tube", Proc. SPIE 11953, Optical Fibers and Sensors for Medical Diagnostics, Treatment and Environmental Applications XXII, 1195303 (2 March 2022); https://doi.org/10.1117/12.2605723

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