We measured the transmission of MgF(2), CaF(2), BaF(2), and fused-silica window materials, using 0.8-ps optical pulses at 193 nm with intensities from 1 to 300 GW/cm(2). The two-photon absorption coefficients beta are extracted from these measurements. The excited excitonic fluorescence in CaF(2) and BaF(2) shows a quadratic dependence on the irradiation intensity in a wide range.
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Kittelmann et al. (1994) studied this question.
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