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The optical polarization as a function of pump-probe delay time for heavily doped at (sample IC311, ). The use of the photoelastic modulator directly gives the circular dichroism (CD), , i.e., the difference in the transmission changes for pump and probe having the same circular polarization (SCP) and the opposite (OCP), shown as the solid symbols in the inset. The population decay, , was obtained from a linearly polarized (LP) experiment, shown as the open symbols in the inset. The solid curve is a fit of a single exponential, giving a measured decay constant of .
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