We report for the first time, to the best of our knowledge, on a large mode area Er-doped photonic crystal fiber laser system. The fiber core had a diameter of and NA of leading to a mode field diameter of about around wavelength. More than of single-frequency output power at could be extracted using a master-oscillator power-amplifier scheme. Near diffraction limited output beam quality has been verified by measuring the content with a nonconfocal scanning ring cavity.
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