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Proceedings Paper

Ray-tracing of optically modified fiber tips for laser angioplasty
Author(s): Rudolf M. Verdaasdonck; Cornelius Borst
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Paper Abstract

Ray-tracing was used to calculate the beam profiles and spatial intensity distributions of modified fiber tips used in laser angioplasty. The position of the highest irradiance and the increase in power density relative to the power density at the tip of a bare fiber were calculated for probes made of silica or sapphire, in air and water. The computations were compared to paraxial theory and measurements on ball-shaped fibers and hemispherical probes. The calculated beam profiles and the irradiance distributions of the probes were in agreement with the measurements. The position of the highest irradiance and the power density increase depended on the ratio between the radius of the sphere Rs and the fiber Rf and on the refractive index. Intermal reflections limited the power density increase for smaller ratios Rs/Rf. In water, the description of beam propagation from silica probes using paraxial optics theory was not in agreement with the ray-tracing results. Ray-tracing is useful to analyze the optical characteristics and to optimize the design of optically modified fiber tips when paraxial optics theory cannot be applied.

Paper Details

Date Published: 1 May 1991
PDF: 8 pages
Proc. SPIE 1425, Diagnostic and Therapeutic Cardiovascular Interventions, (1 May 1991); doi: 10.1117/12.44022
Show Author Affiliations
Rudolf M. Verdaasdonck, Univ. Hospital Utrecht and Interuniversity Cardiology Institute (Netherlands)
Cornelius Borst, Univ. Hospital Utrecht and Interuniversity Cardiology Institute (Netherlands)

Published in SPIE Proceedings Vol. 1425:
Diagnostic and Therapeutic Cardiovascular Interventions
George S. Abela, Editor(s)

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