High power amplification of an electro-optic frequency comb to 200W is achieved, featuring sub 500 fs pulses over a widely tunable repetition rate in the 1-18 GHz range. The final amplification stage of the monolithic set-up includes a full-silica large-mode-area microstructured polarization-maintaining ytterbium-doped fiber with a mode field diameter of 24 µm and M2 -parameter values below 1.1. Pulse durations as low as 192 fs were recorded from output pickoff compression.
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