We exploit recombination luminescence of self-trapped excitons for the measurement of the four-photon absorption cross section in KBr at 532 nm. The value is found to be σ⁽⁴⁾=(2±{}1)×{}10^-112 cm⁸ sec³. The validity of this method is verified by comparison with a four-photon absorption model describing the interaction process.
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Shen et al. (1987) studied this question.
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