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Proceedings Paper

Transmission characteristics of sealed hollow waveguides for Er:YAG laser radiation and their application in the ophthalmology
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Paper Abstract

For the last years, several types of hollow waveguides have been under development and, as proved, these waveguides can deliver radiation to the target with high transmittances. The problem appears in the case of the so-called 'contact mode' when, in medical applications, the end of the waveguide is in contact with the soft or hard tissues. The irradiated substance is melted or ablated and a part of this material usually destroys the inner surface of the waveguide end. To overcome these problems, the end of the hollow waveguide must be sealed .In this paper, the results with two types of sealed hollow waveguides prepared for the delivery of Er:YAG laser radiation were investigated. Sealing was conducted by a cap of short Pyrex or fused silica glass tube whose inner diameter was just slightly larger than the outer diameter of the hollow waveguide to be sealed. The transmittance of the fused silica cap connected with the hollow glass waveguide was measured to be 94%, Pyrex glass cap transmittance was found to be slightly smaller (78%). The damage output energy threshold of the cap material was found 750 mJ. This value was sufficiently high for using this sealed waveguides in the ophthalmology application.

Paper Details

Date Published: 26 March 2002
PDF: 8 pages
Proc. SPIE 4616, Optical Fibers and Sensors for Medical Applications II, (26 March 2002); doi: 10.1117/12.463806
Show Author Affiliations
Helena Jelinkova, Czech Technical Univ. (Czech Republic)
Michal Nemec, Czech Technical Univ. (Czech Republic)
Jan Sulc, Czech Technical Univ. (Czech Republic)
Jiri Pasta, Central Military Hospital (Czech Republic)
Katsumasa Iwai, Tohoku Univ. (Japan)
Yukio Abe, Tohoku Univ. (Japan)
Yi-Wei Shi, Tohoku Univ. (Japan)
Yuji Matsuura, Tohoku Univ. (Japan)
Mitsunobu Miyagi, Tohoku Univ. (Japan)

Published in SPIE Proceedings Vol. 4616:
Optical Fibers and Sensors for Medical Applications II
Israel Gannot, Editor(s)

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