The authors report experimental results on the optical limiting behavior of a bismuth oxide-based glass by exciting the samples with nanosecond laser pulses at 532 and 598 nm. The results show that two-photon and free-carrier absorption processes contribute for the nonlinear absorption. Values for beta, the two-photon absorption coefficient, and sigma_e, the absorption cross section due to free carriers, were determined. The values for beta and sigma_e are dependent on the amount of bismuth oxide in the glass composition
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