Abstract
We have observed and quantificd the broadband transient absorption in KDP and KD*P when these crystals are exposed to intense UV radiation. Defect sites are generated in the crystals by two-photon absorption of the UV light field. These sites, in turn, absorb light from the UV to the near-IR regions of the spectrum. The induced defects arc quantified to have 30% absorption at 532 nm for a 10-ns, 1-GW/ cm2, 266-nm excitation pulse for a 0.8-cm crystal thickness. It is probable that this transient absorption is responsible for the anomalously low Nd:glass fourth-harmonic conversion efficiencies previously observed at high peak drive intensities.1
© 1993 Optical Society of America
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