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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

New laser crystals have been developed to convert near infrared laser light into a 3 micrometers laser beam. With this concept the 3 micrometers laser light is created directly at the position where the application occur, either inside the body or on the tissue surface. The problem of transmitting the 3 micrometers laser light through fibers consequently no longer exists. The laser emission is a transition of 5I6 - 5I7 of holmium ions in a BaYb2F8 crystal. Pumping with the Nd:YAG laser line of 1.12 micrometers 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 ion by 1.047 micrometers . With this converter crystal very small systems can be realized for endoscopic applications or for handheld lasers. The advantages of this converter crystal are high conversion efficiency of 25%, low dependence of conversion efficiency versus Ho and Yb concentrations, pump density and pump geometry. Pulsed systems for laser ablation of soft and hard tissue and also cw-applications of the 3 micrometers radiation are possible.

Paper Details

Date Published: 1 January 1998
PDF: 5 pages
Proc. SPIE 3199, Biomedical Systems and Technologies II, (1 January 1998); doi: 10.1117/12.301131
Show Author Affiliations
Rudolf W. Steiner, Institut fuer Lasertechnologien in der Medizin 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. 3199:
Biomedical Systems and Technologies II
Francesco Baldini; Nathan I. Croitoru; Mark Russell Dickinson; Martin Frenz; Mitsunobu Miyagi; Riccardo Pratesi; Stefan Seeger, Editor(s)

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