It is important to measure transient responses of excitons in quantum dots (QDs) from viewpoints of fundamental and applied researches [1]. Ultrafast nonlinear spectroscopies such as pump-probe (PP) and photon echo (PE) techniques have been traditionally used to measure population and coherent dynamics of QDs. However, as traditional PP and PE techniques use mechanical stages to scan the time delay between excitation pulses, there have been problems such as a short measurable time range, long acquisition time, and low signal-to-noise (S/N) ratio.

© 2019 Japan Society of Applied Physics, The Optical Society (OSA)

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