Abstract
We have investigated the nature and dynamics of resonant secondary emission from quantum wells, a subject of considerable current interest, 1−3 using a novel approach in which the sample is resonantly excited by a pair of phase-locked pulses, and the emission is detected by femtosecond upconversion. This technique allows us to probe the dynamics of photoexcited polarization from a distinct perspective and gives new insights in the femtosecond dynamics of secondary emission (SE) and its coherence properties simultaneously. In particular, we identify for the first time to our knowledge, three different contributions to SE with different coherence properties in time. Furthermore, we show that the coherent SE can be explained by a new intrinsic model based on semiconductor Bloch equations that, in contrast to all earlier models, does not require the presence of disorder-induced local-ization.4
© 1998 Optical Society of America
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