Spectrally-Resolved Femtosecond-Four-Wave Mixing on Semiconductors
Femtosecond-four-wave mixing is a powerful tool to study the loss of coherence (dephasing) of elementary excitations in solids1. Usually the spectrally integrated, diffracted wave is detected as a function of time delay. It is, however, in many situations a priori not clear, which states actually contribute to the coherent diffracted wave. In order to get a more detailed understanding of the coherent dynamics of continuum states and their interplay with excitons, we spectrally resolve the diffracted wave in femtosecond-four-wave mixing as a function of time delay for different excitation conditions2. We also investigate the dependence of the four-wave-mixing spectra on the polarization of the two incident beams. These low-density results deliver information on the density dependence of the dephasing time of both, continuum and exciton states.
KeywordsContinuum State Diffract Wave Exciton State Polarization Dependence Linear Birefringence
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