Numerical analysis of modal instability onset in fiber amplifiers

Benjamin G. Ward

doi:10.1117/12.2038648

7 March 2014 Numerical analysis of modal instability onset in fiber amplifiers

Benjamin G. Ward

Author Affiliations +

Proceedings Volume 8961, Fiber Lasers XI: Technology, Systems, and Applications; 89611U (2014) https://doi.org/10.1117/12.2038648
Event: SPIE LASE, 2014, San Francisco, California, United States

Abstract

Numerical analysis of the onset of modal instability in fiber amplifiers is presented. Specifically calculations of the evolution of the intensity fluctuation spectrum along the fiber for a sampling point offset from the core center are presented for different instability onset conditions. These include seeding with LP01 only, seeding with LP01 and LP11 at the same frequency, seeding with LP01 and LP11 at offset frequencies, and seeding taking quantum shot noise into account. The position dependent spectra are shown to be very similar for each of these cases suggesting a common instability mechanism.

Citation Download Citation

Benjamin G. Ward, Benjamin G. Ward, "Numerical analysis of modal instability onset in fiber amplifiers", Proc. SPIE 8961, Fiber Lasers XI: Technology, Systems, and Applications, 89611U (7 March 2014); doi: 10.1117/12.2038648; https://doi.org/10.1117/12.2038648

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