Abstract

We present a high-average-power femtosecond laser system at 520nm central wavelength. The laser system delivers sub-500fs pulses with 135W average power at a pulse repetition rate of 5.25MHz. Excellent beam quality is provided by high power fiber amplifiers and maintained during frequency doubling, resulting in a beam quality factor of M2<1.2. To our knowledge, the system presented here is the highest average power green laser source generating femtosecond pulses with diffraction-limited beam quality.

© 2011 Optical Society of America

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