Stimulated Brillouin scattering in Er/Yb co-doped fiber pulse amplifiers
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Key Laboratory of Opto-electronic Information Science & Technology of Ministry of Education, College of Precision Instrument & Opto-electronics Engineering, Tianjin University, Tianjin 300072, China
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Corresponding author:
NING Ji-ping, jpning@tju.edu.cn
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Received Date:
2008-11-08
Accepted Date:
2008-12-11
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Abstract
In order to simulate the stimulated Brillouin scattering(SBS)in a pulse amplifier,its transient model was modified based on the time dependent rate equation in an Er/Yb co-doped fiber,including both gain-increasing processes of signal light transfer and dissipation of inverse populations.The influence of SBS on the single pulse energy,peak power,spectrum and time domain waveform in a fiber laser with high power,low repetition rate,narrow pulse width was analyzed.A two-stage master oscillator power amplifier(MOPA)experimental setup was built based on a 156kHz,Q-switched pulse signal.In the experiment,average output power of 1.32W was obtained and the frequency spectra and time domain waveform of serial SBS was observed. The experimental results are conformal to the theoretical results,which proves the validity of the modified model.
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