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

Biermann, K.; Nickel, D.; Reimann, K.; Woerner, M.; Elsaesser, T.; Ku¨nzel, H.
March 2002
Applied Physics Letters;3/18/2002, Vol. 80 Issue 11, p1936
Academic Journal
The ultrafast optical response of low-temperature-grown GalnAs/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 x 10[sup 17] cm[sup -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.


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