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Using optical pulses of variable duration up to 80 ps, we report on spincoherence initialization and its subsequent detection in n-type singly-chargedquantum dots, subject to a transverse magnetic field, by pump-probe techniques.We demonstrate experimentally and theoretically that the spin coherencegeneration and readout efficiencies are determined by the ratio of laser pulseduration to spin precession period: An increasing magnetic field suppresses thespin coherence signals for a fixed duration of pump and/or probe pulses, andthis suppression occurs for smaller fields the longer the pulse duration is.The reason for suppression is the varying spin orientation due to precessionduring pulse action.

Generation and detection of mode-locked spin coherence in (In,Ga)As/GaAs quantum dots by laser pulses of long duration