Abstract
Third harmonic conversion is an effective technique to generate laser radiation at 355 nm from high power solid state lasers. Numerous studies have shown that conversion efficiency depends on parameters such as laser beam quality, crystal nonlinear coefficient, crystal optical quality, and interaction geometry. Relatively little attention has been given to possible limitation in conversion efficiency due to two photon absorption (TPA) at the third harmonic wavelength (355 nm). We have conducted two photon absorption measurements in more than a dozen KDP crystals. The investigated crystals had different doping concentrations and were doped with different impurities. The results of these investigations show that TPA is always present in KDP crystals at 355 nm and is strongly dependent on crystal composition. The TPA coefficient β varied from β= 0.001 to 0.02 cm/GW.
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