Hessler, T.Haacke, S.Pleumeekers, J. L.Selbmann, P. E.Dupertuis, M. A.Deveaud, B.Taylor, R. A.Doussiere, P.Bachmann, M.Ducellier, T.Emery, J. Y.2007-08-312007-08-312007-08-31199710.1088/1355-5111/9/5/003https://infoscience.epfl.ch/handle/20.500.14299/11239WOS:A1997YB24200003Pump and probe measurements with femtosecond resolution are performed on a gain-clamped semiconductor optical amplifier, a structure that contains a lasing mode. The corresponding relaxation oscillations are observed in the temporal gain recovery of the amplifier. The current dependence of the oscillations is well reproduced by a small-signal analysis of the laser rate equations. The gain recovery can be very fast, we measure damping rates of up to 40 GHz.SUBPICOSECOND GAINLASER-AMPLIFIERSDYNAMICStext::journal::journal article::research article