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