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Proceedings Paper

3-um laser converter for medical applications
Author(s): Rudolf W. Steiner; Hans-Joachim Pohl; I. A. Mironov
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Paper Abstract

As an alternative to the 2,94 μm Er:YAG laser, new laser crystals have been developed to convert near IR laser light into a 3 μm laser beam. With this concept the 3 μm laser light is created directly at the position where the applications occur, either inside the body or on the tissue surface. The problem of transmitting the 3 μm laser light through fibers consequently no longer exists. The emission line of the laser-converter (L-C) crystal corresponds to a transition of the 5I6 to the 5I7 energy niveau of holmium ions, e.g. in a BaYb2F8 crystal. Pumping with the Nd:YAG laser line of 1.12 μm leads to direct excitation of holmium ions from the 5I8 niveau to the upper laser level. This direct pumping is more efficient than pumping of the Yb ions at 1.047 μm. With this L-C very small systems can be realized for endoscopic applications or for handheld lasers. The advantages of this converter crystals are high conversion efficiency of 25% and low dependence of conversion efficiency on Ho and Yb concentrations, pump density and pump geometry. Pulsed system for laser ablation of soft and hard tissue and also cw-applications of the 3 μm radiation are possible.

Paper Details

Date Published: 5 June 1998
PDF: 5 pages
Proc. SPIE 3262, Surgical-Assist Systems, (5 June 1998); doi: 10.1117/12.309481
Show Author Affiliations
Rudolf W. Steiner, Institut fuer Lasertechnologien in der Medizen und Messtechnik an der Univ. Ulm (Germany)
Hans-Joachim Pohl, VITCON (Germany)
I. A. Mironov, S.I. Vavilov State Optical Institute (Russia)

Published in SPIE Proceedings Vol. 3262:
Surgical-Assist Systems
Roger Von Hanwehr M.D.; Marilyn Sue Bogner; Steven T. Charles M.D.; Abraham Katzir; Marilyn Sue Bogner; Steven T. Charles M.D.; James A. Harrington; Warren S. Grundfest M.D.; Louis S. Lome; Warren S. Grundfest M.D.; James A. Harrington; Abraham Katzir; Louis S. Lome; Michael W. Vannier M.D.; Roger Von Hanwehr M.D., Editor(s)

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