利用提拉法,从掺入11mol％K2O和1mol％MgO的化学配比LiNbO3熔体中生长了高质量的掺镁近化学计量比LiNbO3晶体.与同成分LiNbO3晶体相比,紫外吸收边发生明显蓝移,OH-红外吸收峰的位置和波形也发生了显著的变化,初步断定晶体中Mg2+的掺杂浓度已达到抗光伤阈值浓度.酸腐蚀结果表明,晶体具有区域性单畴结构.
A kind of Mg-doped near stoichiometric LiNbO3 crystal was grown with Czochralski method from
a stoichiometric melt with addition of 11mol% K2O and 1mol% MgO. Compared with congruent LiNbO3 crystal, its ultraviolet absorption
edge shifts towards short wavelength and the location and shape of the OH- infrared absorption band also change distinctly, so that the Mg2+
doping concentration can be considered as having reached the optical damage resistant threshold concentration. Acid etching result shows that the
crystal has regional single domain structure.
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