The broad fluorescence of Ytterbium doped lasers allows tunability and/or subpicosecond pulse generation at wavelengths around 1040nm. Also, the small quantum defect (<0.1) and high quantum efficiency reduce the thermal load. The simple energy level scheme of the Yb ion minimizes undesirable effects such as upconversion, excitedstate absorption and concentration quenching and is particularly suited to intracavity frequency-doubled lasers. As a result there is a growing range of mode-locked Yb3+-doped lasers, including the 40mW, 90fs pulses from a Yb3+:Ca4GdO(BO3)3 laser1 as well as the 200mW, 112fs pulses from a Yb3+:KGd(WO4)2 laser2. In particular, Yb:YAl3(BO3)4 (Yb: YAB) has a large second-order nonlinearity (deff >1.4pm/V) and favorable laser properties making it well suited to visible subpicosecond pulse generation. CW and Q-switched Yb:YAB lasers3,4 have previously been demonstrated with 1.1W of green output.