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Experiment and Numerical Modeling of High-Power Passively Q-Switched Ytterbium-Doped Double-Clad Fiber Lasers

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3 Author(s)
Lei Pan ; Dept. of Electr. & Comput. Eng., Univ. of Alberta, Edmonton, AB, Canada ; Utkin, I. ; Fedosejevs, R.

Two high-power and high-repetition-rate passively Q-switched Yb-doped double-clad fiber lasers have been demonstrated with small (5.4 ¿m) and medium (10 ¿m) core diameters using Cr4+ :YAG as an external saturable absorber. At a pump power of 13.8 W, 7.8 W single-mode outputs have been obtained with a pulse repetition rate of 120 kHz, pulse energy of 65 ¿J , and pulse duration of 116 ns. A theoretical model is developed to predict the laser spectrum and numerically simulate the output characteristics versus pump power. The focused beam in Cr4+:YAG is assumed to have a Gaussian profile and is analyzed using traveling wave rate equations. The effect of amplified spontaneous emission is also investigated in the simulation, which shows reasonable agreement with experimental observations.

Published in:

Quantum Electronics, IEEE Journal of  (Volume:46 ,  Issue: 1 )

Date of Publication:

Jan. 2010

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