Pal, Mrinmay and Das Chowdhury, Sourav and Shekhar, Nishant K and Sen, Ranjan (2015) Experimental study of backscattering pulses and broadband generation in a Q-switched MOPA. In: FIBER LASERS XII: TECHNOLOGY, SYSTEMS, AND APPLICATIONS, FEB 09-12, 2015, San Francisco, CA.

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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 20 KHz repetition rate due to different scattering effects in 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.

Item Type: Conference or Workshop Item (Paper)
Additional Information: Conference on Fiber Lasers XII - Technology, Systems, and Applications, San Francisco, CA, FEB 09-12, 2015
Subjects: Processing Science
Divisions: Fiber Optics and Photonics
Depositing User: Bidhan Chaudhuri
Date Deposited: 01 Jan 2016 09:27
Last Modified: 01 Jan 2016 09:27

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