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 $40\mathrm{\mu m}$ and NA of $<0.04$ leading to a mode field diameter of about $31\mathrm{\mu m}$ around $1550\mathrm{nm}$ wavelength. More than $70\mathrm{W}$ of single-frequency output power at $1556\mathrm{nm}$ could be extracted using a master-oscillator power-amplifier scheme. Near diffraction limited output beam quality has been verified by measuring the ${\mathrm{TEM}}_{00}$ content with a nonconfocal scanning ring cavity.

© 2011 Optical Society of America

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