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We used a new broadband spectroscopic technique to measure the dielectric function of GaAs over the spectral range of 1. 5--3. 5 eV following intense 70-fs laser excitation. The results provide the most detailed information thus far on the electron and lattice dynamics both above and below the fluence threshold for permanent damage, Fₓ₇0ex{0ex}=0ex{0ex}1. 00ex{0ex}kJ/m^2. There are three distinct regimes of behavior: lattice heating (0. 8Fₓ₇). Below Fₓ₇, the changes are completely reversible.
Li et al. (Mon,) studied this question.