High-fidelity periodic domain structures in KTiOAsO_4 for the visible spectral range

Abstract

We demonstrate room temperature periodic poling of KTiOAsO4 crystals with a period of 8.49 μm for second harmonic generation of 1066 nm wavelength. The crystals are tested in a continuous wave SHG setup at 533 nm and show high quality periodic ferroelectric domain structure across the whole 1 mm crystal thickness, exhibiting deff = 10.5 pm/V and normalized conversion efficiency of 1.2%/Wcm.