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Experimental and theoretical studies of all-optical spin pump and probe ofresident electrons in CdTe/(Cd,Mg)Te semiconductor quantum wells are reported.A two-color Hanle-MOKE technique (based on continuous-wave excitation) andtime-resolved Kerr rotation in the regime of resonant spin amplification (basedon pulsed excitation) provide a complementary measure of electron spinrelaxation time. Influence of electron localization on long-lived spincoherence is examined by means of spectral and temperature dependencies.Various scenarios of spin polarization generation (via the trion and excitonstates) are analyzed and difference between continuous-wave and pulsedexcitations is considered. Effects related to inhomogeneous distribution of$g$-factor and anisotropic spin relaxation time on measured quantities arediscussed.

Time-resolved and continuous-wave optical spin pumping of semiconductor quantum wells