Fabrication of shatter-proof metal hollow-core optical fibers for endoscopic mid-infrared laser applications

Katsumasa Iwai, Hiroyuki Takaku, Mitsunobu Miyagi, Yi Wei Shi, Yuji Matsuura

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

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.

Original languageEnglish
Article number24
JournalFibers
Volume6
Issue number2
DOIs
Publication statusPublished - 2018 Jun 1

Keywords

  • Carbon dioxide laser
  • Endoscopic laser applications
  • Hollow optical fiber

ASJC Scopus subject areas

  • Ceramics and Composites
  • Civil and Structural Engineering
  • Biomaterials
  • Mechanics of Materials

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