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Pulse Energy Scaling by Optimizing Cavity Management in Low Repetition Rate Erbium-Doped Fiber Femtosecond Lasers

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4 Author(s)
Junsong Peng ; Department of Physics, State Key Lab of Advanced Optical Communication Systems and Networks, Shanghai Jiao Tong University, Shanghai, China ; Li Zhan ; Shouyu Luo ; Qishun Shen

We experimentally demonstrate direct generation of 51 nJ, 284-fs ultrashort pulses in an all-fiber cavity-optimized erbium-doped laser with a low repetition rate of 2.68 MHz. The conversion efficiency of the laser is about 10%. The laser is mode-locked by nonlinear polarization rotation. Such high energy and ultrashort duration benefits from using large output ratio (90%), elongating the cavity length, dispersion management, and bidirectional high-power pumping in the laser. Further decreasing the net dispersion of the laser by using a dispersion-compensated fiber can reduce the pulse duration to 160 fs. In addition, variation of spectral width due to an invisible filter in the laser is experimentally demonstrated.

Published in:

IEEE Journal of Quantum Electronics  (Volume:49 ,  Issue: 4 )