Urea has been found to be phase matchable for type-1 fifth-harmonic generation by mixing the Nd:YAG laser fundamental and fourth-harmonic radiation at room temperature. A peak power as high as 4.5 MW with an average power of 320 mW was obtained at 2128 Å in a 5 mm long crystal.
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Kiyoshi Katō (1980) studied this question.
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