Abstract
Thermal waveguide changes in high power fiber lasers have been widely neglected up to now, since they have a very small impact on fibers with mode field diameters of a few tens of micrometers. However, with fibers now approaching mode field diameters of 100 µm, these thermal effects become very important. We demonstrate experimentally how thermal waveguide changes enable sweeping through avoided crossings. Furthermore, we quantify the thermally induced index change and the accompanying mode shrinking.
© 2012 Optical Society of America
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