Experimental study of backscattering pulses and broadband generation in a Q-switched MOPA

Mrinmay Pal; Sourav Daschowdhury; Nishant Shekhar; Ranjan Sen

doi:10.1117/12.2077162

4 March 2015 Experimental study of backscattering pulses and broadband generation in a Q-switched MOPA

Mrinmay Pal, Sourav Daschowdhury, Nishant Shekhar, Ranjan Sen

Proceedings Volume 9344, Fiber Lasers XII: Technology, Systems, and Applications; 93442T (2015) https://doi.org/10.1117/12.2077162
Event: SPIE LASE, 2015, San Francisco, California, United States

Abstract

In a master oscillator fiber amplifier (MOPA) system, we have experimentally studied nonlinear phenomena originating in the amplifier Yb-fiber during amplification of Q-switched pulse. During amplification, the Yb-doped active fiber generated backscattered pulses followed by amplified pulse breaking and high peak power short pulse generation. The backscattered pulses were delayed maximum by 30ns and seed pulse of width 108ns was broadened to 140ns at 20KHz repetition rate due to different scattering effects in a 8m long Yb-doped double clad fiber. At higher pump power, the output pulse showed unstable pulse envelops and eventually broke into multiple short pulses. A broadband output was observed from 1050 to 1650nm. This unwanted pulse breaking was observed which caused catastrophic damage to the MOPA system occasionally.

Citation Download Citation

Mrinmay Pal, Sourav Daschowdhury, Nishant Shekhar, and Ranjan Sen "Experimental study of backscattering pulses and broadband generation in a Q-switched MOPA", Proc. SPIE 9344, Fiber Lasers XII: Technology, Systems, and Applications, 93442T (4 March 2015); https://doi.org/10.1117/12.2077162

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