Mode profiling of optical fibers at high laser powers

P. C. Nielsen; D. B. Pedersen; R. B. Simonsen; D. N. Erschens; M. F. Lilbaek; L. Eskildsen; K. Rottwitt; H. N. Hansen

doi:10.1117/12.763022

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22 February 2008 Mode profiling of optical fibers at high laser powers

P. C. Nielsen; D. B. Pedersen; R. B. Simonsen; D. N. Erschens; M. F. Lilbaek; L. Eskildsen; K. Rottwitt; H. N. Hansen

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Proceedings Volume 6873, Fiber Lasers V: Technology, Systems, and Applications; 687318 (2008) https://doi.org/10.1117/12.763022
Event: Lasers and Applications in Science and Engineering, 2008, San Jose, California, United States

Abstract

This paper describes the development of a measuring equipment capable of analysing the beam profile at high optical powers emitted by delivery fibers used in manufacturing processes. Together with the optical delivery system, the output beam quality from the delivery fiber and the shape of the focused spot can be determined. The analyser is based on the principle of a rotating wire being swept though the laser beam, while the reflected signal is recorded [1]. By changing the incident angle of the rotating rod from 0° to 360° in relation to the fiber, the full profile of the laser beam is obtained. Choosing a highly reflective rod material and a sufficiently high rotation speed, these measurements can be done with high laser powers, without any additional optical elements between the fiber and analyzer. The performance of the analyzer was evaluated by coupling laser light into different fibers, and measuring the output beam profiles. Fibers with different core diameters and different surface qualities were tested.

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P. C. Nielsen, D. B. Pedersen, R. B. Simonsen, D. N. Erschens, M. F. Lilbaek, L. Eskildsen, K. Rottwitt, and H. N. Hansen "Mode profiling of optical fibers at high laser powers", Proc. SPIE 6873, Fiber Lasers V: Technology, Systems, and Applications, 687318 (22 February 2008); https://doi.org/10.1117/12.763022

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