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Ultrafast optical nonlinearity of low-temperature-grown GaInAs/AlInAs quantum wells at wavelengths around 1.55 µm



Applied Physics Letters 80 (2002), No.11, pp.1936-1938
ISSN: 0003-6951
ISSN: 1077-3118
Journal Article
Fraunhofer HHI ()

The ultrafast optical response of low-temperature grown aInAs/AlInAs multiple quantum wells is studied in pump-probe experiments with a femtosecond Er:fiber laser. As-grown samples doped with beryllium (concentration of 8´10 17 cm -3 ) display a nonlinear transmission change, which decays by carrier trapping with a time constant of 230 fs. Experiments with pairs of ultrashort pulses separated by 1.5 ps demonstrate a fast modulation of transmission and very small accumulation effects, making this material highly promising for all-optical switching. Substantially longer recovery times are found in annealed, Be-doped samples and in undoped samples.