Vasil'Ev, P. P.Sergeev, A. B.Smetanin, I. V.Weig, T.Schwarz, U. T.Sulmoni, L.Dorsaz, J.Lamy, J.-M.Carlin, J.-F.Grandjean, N.Zeng, X.Stadelmann, T.Grossmann, S.Hoogerwerf, A. C.Boiko, D. L.2013-05-132013-05-132013-05-13201310.1063/1.4798264https://infoscience.epfl.ch/handle/20.500.14299/92166WOS:000316967100015Passive mode-locked pulses with repetition frequencies in the range 40 to 90 GHz were observed in blue-violet GaN-based quantum-well lasers without external cavities. The lasers had two-section geometry with built-in saturable absorber section. The individual pulses had durations as short as 3-5 ps at peak powers of around 320 mW. (C) 2013 American Institute of Physics. [http://dx.doi.org/10.1063/1.4798264]text::journal::journal article::research article