Abstract

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 40μm and NA of <0.04 leading to a mode field diameter of about 31μm around 1550nm wavelength. More than 70W of single-frequency output power at 1556nm could be extracted using a master-oscillator power-amplifier scheme. Near diffraction limited output beam quality has been verified by measuring the TEM00 content with a nonconfocal scanning ring cavity.

© 2011 Optical Society of America

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