【摘要】 采用助熔剂籽晶提拉法成功生长了近化学计量比钽酸锂单晶。采用自行研制的极化设备,研究了大面积且厚度达到1.8 mm的近化学计量比钽酸锂晶体的电场室温极化过程,针对在极化过程中外部施加高电压时产生的回流现象,采用改变极化时间和相应的极化电压来抑制的方法,取得了较好的效果。利用化学腐蚀法,成功地观察了钽酸锂晶体的大面积畴反转。发现近化学计量比钽酸锂反向矫顽场较正向矫顽场低,并利用这一性质,进一步研究了近化学计量比钽酸锂的极化特性。更多还原

【Abstract】 MgO doped near stoichiometric lithium tantalate has been grown by adding flux method.By using the equipment made by ourselves,the electrical poling process in room temperature on stoichiometric LiTaO3 crystal with the thickness of 1.8 mm is studied in detail.In order to restrain back current during poling process,control of electrical poling time and poling voltage is adopted in the experiments.Large area domain inversion of stoichiometric LiTaO3 is successfully realized proved by chemistry etching method.It was discovered coercive force field of negative direction is lower than that of positive direction.And this character was used to investigate the polarization characterization.更多还原