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135 W average-power femtosecond pulses at 520 nm from a frequency-doubled fiber laser system

: Rothhardt, J.; Eidam, T.; Hädrich, S.; Jansen, F.; Stutzki, F.; Gottschall, T.; Andersen, T.V.; Limpert, J.; Tünnermann, A.


Optics Letters 36 (2011), Nr.3, S.316-318
ISSN: 0146-9592
Fraunhofer IOF ()

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.