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Proceedings Paper

Dependence of output beam profile on launching conditions in fiber-optic beam delivery systems for Nd:YAG lasers
Author(s): Daoning Su; Alvaro A. P. Boechat; Julian D. C. Jones
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Paper Abstract

For large-core optical fibers of a few meters length, which are typical of those used in beam delivery systems for high power Nd:YAG lasers, it is shown that the near-field profile of the output beam is a strong function of the launching conditions. The output profile depends on both the input spot size and its alignment relative to the fiber axis. A theoretical model has been developed for step index fiber which shows that the output profile depends on the distribution of guided power between meridional modes and groups of skew modes. It is also shown that the modal distribution is a function of the launching conditions. A relationship is hence derived between the launching conditions and the output profile. The predictions of the theoretical model are consistent with experiment.

Paper Details

Date Published: 1 October 1991
PDF: 11 pages
Proc. SPIE 1502, Industrial and Scientific Uses of High-Power Lasers, (1 October 1991); doi: 10.1117/12.46883
Show Author Affiliations
Daoning Su, Heriot-Watt Univ. (United Kingdom)
Alvaro A. P. Boechat, Heriot-Watt Univ. (United Kingdom)
Julian D. C. Jones, Heriot-Watt Univ. (United Kingdom)

Published in SPIE Proceedings Vol. 1502:
Industrial and Scientific Uses of High-Power Lasers
Jean Pierre Billon; Edouard Fabre, Editor(s)

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