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We demonstrate a broadband all polarization-maintaining Yb-fiber laser system that provides 137-nJ pulse at 140-fs duration. The pulses are generated in a passively mode-locked laser in which the nonlinear amplifying loop mirror acts as the mode locker, an integrated nonreciprocal device biases π/2 phase shift to reduce the mode locking threshold, and a pair of gratings are involved to force the oscillator...
Divided-pulse nonlinear amplification was developed in the anomalous dispersion regime by combining the concepts of divided-pulse nonlinear amplification and divided-pulse compression. We realized compressor-free ultrafast pulse amplifiers at 1.5 μm with the help of simultaneous pulse amplification and compression in single-mode and few-mode fibers with anomalous dispersion. With optimized positive...
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