Destructive random backscattering pulses showing Brillouin signature in MOPA fiber laser systems

M. Melo; M. O. Berendt; J. M. Sousa

doi:10.1117/12.2001898

26 February 2013 Destructive random backscattering pulses showing Brillouin signature in MOPA fiber laser systems

M. Melo, M. O. Berendt, J. M. Sousa

Proceedings Volume 8601, Fiber Lasers X: Technology, Systems, and Applications; 86011P (2013) https://doi.org/10.1117/12.2001898
Event: SPIE LASE, 2013, San Francisco, California, United States

Abstract

The origin of random highly peaked backward pulses arising from(in) pulsed master oscillator power amplifier (MOPA) fiber lasers systems is studied. These large amplitude short duration pulses when compared to the Rayleigh backscattering may lead to catastrophic failures. This paper presents a systematic study of the backscatter using different seed sources (externally and directly modulated) in a hardened MOPA setup and a delayed self-heterodyne RF domain spectrum analysis technique for its characterization. Fabry-Perot seeded non-polarization maintaining system is found to show hallmark Brillouin frequency shift. The frequency of occurrence strongly depends on the seed characteristics.

Citation Download Citation

M. Melo, M. O. Berendt, and J. M. Sousa "Destructive random backscattering pulses showing Brillouin signature in MOPA fiber laser systems", Proc. SPIE 8601, Fiber Lasers X: Technology, Systems, and Applications, 86011P (26 February 2013); https://doi.org/10.1117/12.2001898

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