Type II sum frequency generation in flux and hydrothermally grown KTP at 1.319 and 1.338 mu m

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Abstract
Type-II, noncritically phase-matched, sum-frequency generation by mixing of the 1.319- and 1.338- mu m lines of a Q-switched Nd:YAG laser with their second harmonics is discussed. Results are presented for KTP crystals grown by both the hydrothermal and the flux technique. A temperature-acceptance width-length product of 8.5+or-0.5 degrees C-cm was determined. Type-II critical phase matching at room temperature, for three different propagation/polarization orientations, is also demonstrated. The differences in the angles required for phase matching between crystals grown by the different techniques are quantified.