【摘要】 研究了掺镁(5mol%)铌酸锂晶体的周期极化特性,发现晶体的极化矫顽场仅为3kV/mm,根据镁掺杂对晶体本征缺陷的影响解释了极化矫顽场降低的原因.采用短脉冲极化电场,对极化电流的热效应进行抑制从而消除了晶体均匀性对制备周期极化光栅的影响,在1mm厚的掺镁(5mol%)铌酸锂晶体上成功制备出了均匀的周期极化光栅.在室温下,利用1.064μm的Nd:YAG调Q激光器对得到的周期极化掺镁铌酸锂晶体进行了倍频实验,在输入功率为75mW时,得到3.5mW的532nm倍频绿光输出,转换效率为4.6%.更多还原

【Abstract】 The periodically poled characteristics of LiNbO₃ doped 5mol% MgO were investigated and the domain reversal field was found to be 3kV/mm. According to the influence of MgO doped on the crystal defect, the decrease reason of the domain reversal field was explained. By using short-pulse field, the periodically poled grating was successfully fabricated in 1.0mm thick MgO:LiNbO₃. Second harmonic green light generation in periodically poled MgO:LiNbO₃ was demonstrated. The green light power of 3.5mW at 532nm is obtained when the fundamental power is 75mW, and the conversion efficiency is 4.6%.更多还原