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Proceedings Paper

Diffusing fiber tips for high-power medical laser applications
Author(s): Christoph H. Schmitz; Stefan B. Spaniol; Volkhard Abraham; Naim Ashraf; Wolfgang Neuberger; Wolfgang Ertmer
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Paper Abstract

For most applications in laser medicine suitable delivery systems are required. We developed fiber optic based diffusing tips especially for photodynamic therapy (PDT) and laser induced thermotherapy (LITT). To realize an adequate emitting cylindrical diffuser the fiber core was abraded by a precision cutter. Hence, the use of scattering media such as TiO2-doped polymers is avoided. Because the diffuser size is mainly determined by the manipulated fiber and a surrounding glass capillary, one can realize small diameters ((phi) approximately equals 3 mm). The laser light is distributed mainly by surface scattering and total reflection at the fiber air boundary. Because the use of absorbing media is avoided, it is possible to apply high laser power as necessary in LITT and pulsed PDT. We produced diffusing tips with lengths of several centimeters and typical diameters of 3 mm. By controlling the fiber-shaping process, a homogeneous intensity profile or even special designs can be achieved. The control is done by either on-line camera surveillance or calculated predictions. A delivery system especially for the photodynamical treatment of female cervix dysplasia has been designed.

Paper Details

Date Published: 3 January 1995
PDF: 7 pages
Proc. SPIE 2631, Medical and Fiber Optic Sensors and Delivery Systems, (3 January 1995); doi: 10.1117/12.229180
Show Author Affiliations
Christoph H. Schmitz, Univ. Hannover (Germany)
Stefan B. Spaniol, Univ. Bonn and CeramOptec GmbH (Germany)
Volkhard Abraham, Univ. Hannover (Germany)
Naim Ashraf, CeramOptek GmbH (Germany)
Wolfgang Neuberger, CeramOptec GmbH (Germany)
Wolfgang Ertmer, Univ. Hannover (Germany)


Published in SPIE Proceedings Vol. 2631:
Medical and Fiber Optic Sensors and Delivery Systems
Nathan I. Croitoru; Mitsunobu Miyagi; Guillermo Orellana; Annamaria Verga Scheggi; Henricus J. C. M. Sterenborg, Editor(s)

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