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Fibers 2018, 6(2), 24; https://doi.org/10.3390/fib6020024

Fabrication of Shatter-Proof Metal Hollow-Core Optical Fibers for Endoscopic Mid-Infrared Laser Applications

1
National Institute of Technology, Sendai College, Sendai 989-3128, Japan
2
Headquarters, Miyagi Gakuin, Sendai 981-8557, Japan
3
School of Information Science and Engineering, Fudan University, Shanghai 200433, China
4
Graduate School of Biomedical Engineering, Tohoku University, Sendai 980-8579, Japan
*
Author to whom correspondence should be addressed.
Received: 27 March 2018 / Revised: 13 April 2018 / Accepted: 14 April 2018 / Published: 18 April 2018
(This article belongs to the Special Issue Hollow core optical fibers)
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Abstract

A method for fabricating robust and thin hollow-core optical fibers that carry mid-infrared light is proposed for use in endoscopic laser applications. The fiber is made of stainless steel tubing, eliminating the risk of scattering small glass fragments inside the body if the fiber breaks. To reduce the inner surface roughness of the tubing, a polymer base layer is formed prior to depositing silver and optical-polymer layers that confine light inside the hollow core. The surface roughness is greatly decreased by re-coating thin polymer base layers. Because of this smooth base layer surface, a uniform optical-polymer film can be formed around the core. As a result, clear interference peaks are observed in both the visible and mid-infrared regions. Transmission losses were also low for the carbon dioxide laser used for medical treatments as well as the visible laser diode used for an aiming beam. Measurements of bending losses for these lasers demonstrate the feasibility of the designed fiber for endoscopic applications. View Full-Text
Keywords: hollow optical fiber; carbon dioxide laser; endoscopic laser applications hollow optical fiber; carbon dioxide laser; endoscopic laser applications
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Iwai, K.; Takaku, H.; Miyagi, M.; Shi, Y.-W.; Matsuura, Y. Fabrication of Shatter-Proof Metal Hollow-Core Optical Fibers for Endoscopic Mid-Infrared Laser Applications. Fibers 2018, 6, 24.

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