Abstract
Several recent two-pulse degenerate four- wave-mixmg experiments on 2D excitons in GaAs showed considerably faster dephasing rates for cross-polarized beams than for colinear polarization.1,2 Moreover, time-resolved analysis of the DFWM signal on some samples revealed a photon echo and a free-induction decaylike behavior for the parallel and perpendicular polarizations, respectively.1
© 1993 Optical Society of America
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