Periodically poled KTiOAsO4 crystals for optical parametric oscillation

Polarization switching and dielectric spectroscopy of KTiOAsO4 (KTA) crysta ls have been studied. This has allowed, for the first time, the fabrication by low temperature poling of periodically-poled domain structures in KTA c rystals (0.5 mm thick, 10 mm long) and also the observation of optical para metric oscillation in the mid-infrared region. The integrity of the periodi c domain pattern and the structural perfection of the periodically poled cr ystal have been demonstrated using scanning electron microscopy (SEM) and h igh-resolution x-ray diffraction imaging.