论文部分内容阅读
研究了514nm可见激光诱导掺铪摩尔分数为3%同成分铌酸锂晶体优先畴成核。利用数字全息干涉术实时记录监测激光诱导优先畴成核过程,再现了该过程中晶体内诱导区域相位分布的变化,通过测量证实成核场随诱导光强的增强呈指数减小。在实验基础上提出诱导过程中出现的沿Z方向的空间电荷场对激光诱导优先畴成核有着非常重要的影响,并给出了激光诱导铌酸锂晶体优先畴成核定性的物理模型。不仅能够为激光诱导晶体铁电畴工程的优化提供重要信息,而且能够为激光诱导铌酸锂晶体优先畴成核机制的研究提供重要实验依据。
The nucleation of the preferred domains of lithium niobate crystals with a 3% identity of hafnium-doped mole fraction induced by 514 nm visible laser was studied. The laser-induced nucleation of the preferred domains was monitored by digital holographic interferometry real-time recording, and the phase distribution of the induced regions in the crystal was reproduced. The nucleation field showed an exponential decrease with the increase of the induced light intensity. On the basis of the experiment, it is proposed that the space charge field along the Z direction appearing in the induction process has a very important influence on the laser-induced nucleation of the preferred domains. The physical model of laser-induced nucleation of the preferred domains of lithium niobate crystals is also given. It not only can provide important information for the optimization of laser-induced crystal ferroelectric domain engineering, but also provide important experimental evidence for laser-induced nucleation mechanism of lithium prefect.