Abstract
A modified Kyropoulos technique is applied to obtain large single domain KNbO3 crystals suitable for optical applications. Colorless and high resistivity crystals up to 30×30×15 mm3 in size are grown with 52∼55 mole% K2CO3 content under the condition of shallow temperature gradient. Single domain crystals up to 8 mm cube are obtained through poling procedure with a d-c field of approximately 1 kV/cm at about 190°C under slight stress along an a axis. The poled crystals are found to be of good optical quality by microscopic examination with polarized light and experiments on second harmonic generation using 1.06 µCW Nd:YAG laser. The second harmonic efficiency for up-conversion of KNbO3 is found to be as high as that of Ba2NaNb5O15. KNbO3 is revealed to be a potentially useful non-linear material for optical device application.
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