10 February 2011 M2-characterization of beams emerging from LMA fibers by means of modal decomposition
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We report on a fast measurement procedure for the widespread beam propagation ratio of light emerging from LMA fibers. The investigated beam is decomposed into its eigenmodes using a computer generated holographic filter. The modally resolved measurement of amplitudes and phases enables the reconstruction of the optical field. With the full field information, the propagation of the beam through free space is simulated and a virtual caustic measurement is realized. After comparing the presented method with ISO-standard measurements it is applied to conventional step-index fibers as well as to a multicore fiber.
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Daniel Flamm, Christian Schulze, Oliver A. Schmidt, Siegmund Schröter, Michael Duparré, "M2-characterization of beams emerging from LMA fibers by means of modal decomposition", Proc. SPIE 7914, Fiber Lasers VIII: Technology, Systems, and Applications, 79141R (10 February 2011); doi: 10.1117/12.874722; https://doi.org/10.1117/12.874722

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