Fabrication of short-period poled structures and UV sum-frequency generation in 8 mol % MgO-doped congruent LiTaO sub(3) crystal

Heavily (8 mol %) MgO-doped congruent LiTaO sub(3)(MgO:cLT) crystal has wider transparency range and is expected to have higher photorefractive damage resistance than LiNbO sub(3) or non-doped LT crystal. We obtained uniform PP structures with periods of ~7 and ~2 mu m in MgO:cLT crystal and demonstrated UV sum-frequency generation (SFG) experiments at 355 nm wavelength for the first time. The FWHM temperature acceptance bandwidths and the normalized SFG efficiencies were close to the calculated values.