Abstract Domain structure evolution in congruent lithium niobate single crystals under multiple infrared laser pulse irradiation was studied. The structure of narrow domain rays appeared after the first pulse became denser with pulse number due to ray widening and intensive fingering, which led to increasing the domain walls density. The almost constant wall density in the central region of irradiated zone significantly increased near the zone edge. Increase in the initial crystal temperature led to decrease in the wall density. The obtained radial dependence of the wall density was attributed to computer simulated spatial distribution of the pyroelectric field.

中文翻译：

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红外激光多次脉冲加热铌酸锂的畴结构演变

摘要 研究了多红外激光脉冲辐照下全等铌酸锂单晶的畴结构演化。由于射线加宽和密集指法，第一个脉冲随着脉冲数的增加而变得更密，导致畴壁密度增加，因此出现窄畴射线结构。辐照区中心区域几乎恒定的壁密度在靠近区域边缘处显着增加。初始晶体温度的增加导致壁密度的降低。获得的壁密度的径向依赖性归因于热电场的计算机模拟空间分布。