Abstract

We report a novel, Tm-doped photonic crystal fiber (PCF) actively Q-switched oscillator that provides 8.9kW peak power with 435 µJ, 49 ns pulses at 10 kHz repetition rate at 2 μm wavelength. This fiber has a mode-field area >1000μm2, the largest of any flexible PCF providing diffraction-limited beam quality to the best of our knowledge. As an application, the oscillator is used as pump to generate >350nm broadening in 50m of SMF-28 fiber.

© 2012 Optical Society of America

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