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中文摘要：
采用外加电场法制备了LiNbO3单晶周期畴结构.在对不同尺寸周期畴的反转电流进行比较研究的基础上,提出了一种确定反转畴成核时间和纵向贯穿速率的方法.根据这一方法,得到在电场强度为25.1kV/mm,脉冲宽度为50ms的脉冲方波作用下,LiNbO3单晶反转畴的成核时间约为80ns,纵向贯穿速率约为0.1667m/s.
英文摘要：
Periodically poled LiNbO3 was prepared by applying external field.Through a comparison study on switching currents of different sized PPLN,a new method of determining the nucleation time and the velocity of domain tip propagation toward the opposite face of the crystal was proposed.According to this method,a conclusion could be drawn that the nucleation time is 80 ns and the tip velocity of switching domain is 0.1667 m/s,when the external field is 25.1 kV/mm,50 ms square wave pulse.
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