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4 June 2001 Evanescent-wave delivery into a precise tissue area using fiber optic probes
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Proceedings Volume 4253, Optical Fibers and Sensors for Medical Applications; (2001)
Event: BiOS 2001 The International Symposium on Biomedical Optics, 2001, San Jose, CA, United States
We demonstrate a novel all-optical-fiber system for infrared (IR) laser radiation delivery into a precise tissue area. The operating principle of the laser delivery system is based on the use of a direct laser-to-taper coupling and an IR delivery fiber with angle-shaped tip. In our experiment, instead of a conventional lens-based laser-to-fiber coupling we use an uncoated glass hollow taper for a laser-to-fiber coupling. It is a funnel-shaped grazing-incidence-based hollow taper. The laser emission is launched directly, without any focusing elements, into the taper and next into the delivery fiber by a direct taper-to-fiber coupling. The IR fiber delivers the forward emission from a Er:YAG laser ((lambda) equals 2.94 micrometers ) to the tissue to be treated. Moreover, in order to realize a regime of evanescent wave delivery, we use a specially shaped fiber tip with an angled (porro-prism) profile. When the fiber tip is out of the tissue area, the laser emission is backreflected at the angled tip due to total-internal-reflection. However, when the fiber tip is placed on absorbing tissue, it becomes `transparent' for laser emission because of the frustrated- total-internal-reflectance and the energy then is coupled into the absorber. When sufficient energy is transferred, dermatology or other precise surgical processes can be controlled or stopped.
© (2001) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Ilko K. Ilev, Ronald W. Waynant, and Michael A. Bonaguidi "Evanescent-wave delivery into a precise tissue area using fiber optic probes", Proc. SPIE 4253, Optical Fibers and Sensors for Medical Applications, (4 June 2001);

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