Modal interference along a LMA fiber creates an inversion grating with the right period to provide energy transfer between the interfering modes. This effect can lead to a substantial degradation of the beam quality.
© 2011 OSA
C. Jauregui, T. Eidam, J. Limpert, and A. Tünnermann, "Inversion Grating Assisted Beam Quality Degradation in High Power Fiber Laser Systems," in Advances in Optical Materials, OSA Technical Digest (CD) (Optical Society of America, 2011), paper ATuD1.
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