Modelocked thin-disk lasers (TDLs) are currently the leading ultrafast oscillator technology in terms of output power and pulse energy. A multi-pass approach using Yb:YAG delivered 1-ps pulses with 30 µJ and 108 W [1], whereas 140 W with 735-fs were obtained with one pass on Yb:Lu2O3 [2]. The relatively long pulse durations limit the achieved peak power. Reducing the pulse duration of high power oscillators is of impact to many areas such as high-field science. Although large efforts have been dedicated in the past years to find broadband materials for power scaling, the power levels in the sub-300-fs range still remain moderate (fig.1a), mainly due to limited thermal properties. Since 2002, Yb:KYW [3] holds the power record in this regime, but its strong thermal anisotropy has prevented further power scaling. The isotropic sesquioxide Yb:LuScO3 is a promising alternative: 7.2 W in 227-fs pulses were achieved in the first growth run of this material [4].

© 2011 Optical Society of America

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