3-um-laser converter for medical applications

Rudolf W. Steiner; Hans-Joachim Pohl; I. A. Mironov

doi:10.1117/12.301131

1 January 1998 3-um-laser converter for medical applications

Rudolf W. Steiner, Hans-Joachim Pohl, I. A. Mironov

Author Affiliations +

Proceedings Volume 3199, Biomedical Systems and Technologies II; (1998) https://doi.org/10.1117/12.301131
Event: BiOS Europe '97, 1997, San Remo, Italy

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.

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Rudolf W. Steiner, Hans-Joachim Pohl, and I. A. Mironov "3-um-laser converter for medical applications", Proc. SPIE 3199, Biomedical Systems and Technologies II, (1 January 1998); https://doi.org/10.1117/12.301131

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