We propose sealing techniques for medical hollow fibers to protect the inner surface of fibers from debris or water that scatters from targets. First, hollow fibers are sealed with a film of polymer that is easily formed by use of a dipping technique. The transmission loss of 20-μm-thick sealing film was 0.2 dB for Er:YAG laser light, and the maximum energy that is available for the film was 180 mJ. Second, a sealed glass cap was applied to the output end of hollow fiber. The silica-glass cap with a wall thickness of 400 μm shows a transmission loss of 0.5 dB and was not damaged by radiation of 400-mJ energy pulses.
© 2002 Optical Society of America
(060.2390) Fiber optics and optical communications : Fiber optics, infrared
(140.3070) Lasers and laser optics : Infrared and far-infrared lasers
(170.3890) Medical optics and biotechnology : Medical optics instrumentation
Shintaro Mohri, Takao Kasai, Yukio Abe, Yi-Wei Shi, Yuji Matsuura, and Mitsunobu Miyagi, "Optical Properties of End-Sealed Hollow Fibers," Appl. Opt. 41, 1251-1255 (2002)