Effects of Optical Power and Thermal Impacts on Microstructured and Low Index Coated Fibers - A Comparison

摘要

The high power transmission stability is characterized by launching up to 500 W at 940 and 980 nm into the fiber over a period of at least 30 min. The most critical experimental points for comparing the stability results are the reproducible stripping of the coating with a well defined crossover and the strict clean and rectangular preparation of the fiber end faces. The far field and the numerical aperture are used as an indicator for changes of the optical coating properties. Small changes in the refractive index during the power stability tests have been detected for the low index acrylate and for the hybrid material. It was tried to correlate the results with the thermochemical investigations of the used coating materials (DTA, TG). The experimental results show the limits of applicability and the potential of both types of fibers for high power applications.