Abstract
A heavily (8 mol %) MgO-doped congruent LiTaO3 crystal (MgO:cLT) has a wider transparency range and a higher photorefractive damage resistance than LiNbO3 or a non-doped LiTaO3 crystal. We have found that annealing the crystal at 550 °C for 8 h in O2 atmosphere before applying voltage leads to the remarkable improvement for fabricating periodically-poled (PP) structures of good quality in the MgO:cLT crystal. We obtained the uniform PP structure with a period of 7.6 µm and demonstrated quasi-phase-matched second-harmonic generation (SHG) experiments by pumping at 1.064 µm wavelength for the first time. The temperature acceptance bandwidth 4.3 °C and the normalized SHG efficiency 0.30%/W were in good agreement with the calculated value.
Published Version
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