Abstract
An experimental study of two-photon absorption (TPA) in RbBr, KBr, RbI, and KI was done with 10-nsec pulses from the second harmonic of a ruby laser ($2\ensuremath{\hbar}\ensuremath{\omega}=7.12$ eV). The discrepancies found between the herein nanosecond and the previously known picosecond results indicate that optically generated free carriers must be accounted for in short-pulse measurements of TPA cross sections of alkali halides.
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