Dependence of output beam profile on launching conditions in fiber-optic beam delivery systems for Nd:YAG lasers

Daoning Su; Alvaro A. P. Boechat; Julian D. C. Jones

doi:10.1117/12.46883

1 October 1991 Dependence of output beam profile on launching conditions in fiber-optic beam delivery systems for Nd:YAG lasers

Daoning Su, Alvaro A. P. Boechat, Julian D. C. Jones

Author Affiliations +

Proceedings Volume 1502, Industrial and Scientific Uses of High-Power Lasers; (1991) https://doi.org/10.1117/12.46883
Event: ECO4 (The Hague '91), 1991, The Hague, Netherlands

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.

Citation Download Citation

Daoning Su, Alvaro A. P. Boechat, and Julian D. C. Jones "Dependence of output beam profile on launching conditions in fiber-optic beam delivery systems for Nd:YAG lasers", Proc. SPIE 1502, Industrial and Scientific Uses of High-Power Lasers, (1 October 1991); https://doi.org/10.1117/12.46883

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