Abstract
We report on the performance of an Yb-doped, 100μm-core, rod-type photonic crystal fiber (PCF) used as the power amplifier in an actively controlled master-oscillator/power-amplifier optical (MOPA) source. Such PCF is the largestcore fiber to date to exhibit concurrent single-mode beam quality and robust linear polarization in its output. From this MOPA, we obtained peak power in excess of 1.35MW with excellent spectral brightness.
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