We have achieved a record pulse peak power of ~200 MW at 24 W average power and 120 μJ pulse energy in a state-of-the-art thulium-doped fiber CPA system operating at 2 μm wavelength. The achieved peak power is 50 times higher than any other result based on thulium doped fiber amplifiers presented to date. Such performance was enabled by a Tm-doped large-pitch fiber with a mode field diameter of 65 μm, highly efficient dielectric gratings and a Tm-based fiber oscillator operating in the positively stretched-pulse regime.

© 2014 Optical Society of America

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