偏振方向对x-切铌酸锂损伤阈值影响规律(特邀)
Influence of Polarization Direction on Damage Threshold of x-Cut Lithium Niobate(Invited)
温亚楠 1林真源 1季凌飞1
作者信息
- 1. 北京工业大学物理与光电工程学院,北京 100124;北京工业大学跨尺度激光成型制造技术教育部重点实验室,北京 100124;北京市激光应用技术工程技术研究中心,北京 100124
- 折叠
摘要
通过飞秒激光单脉冲实验,探究了偏振方向(0°、45°、90°、135°)对x-切铌酸锂(LN)晶体损伤阈值的影响,发现材料损伤阈值呈现明显的偏振依赖性,90°偏振方向的损伤阈值低于其他偏振方向.通过第一性原理计算,确认了飞秒激光引起的隧穿电离主要导致Nb—O键断裂.而当入射偏振角度为90°时,易导致更多的Nb—O键断裂,在该偏振方向上的损伤阈值降低.该研究有助于更深入地理解超快激光在LN晶体表面的烧蚀过程,对LN晶体表面功能性器件激光制备有重要的参考价值.
Abstract
Through femtosecond laser single-pulse experiments,we investigated the influence of polarization directions(0°,45°,90°,and 135°)on the damage threshold of x-cut lithium niobate(LN)crystals.We found that the material damage threshold exhibited considerable polarization dependence,with the damage threshold along the 90° polarization direction being lower than those in other polarization directions.Through first-principles calculations,we confirmed that tunneling ionization caused by the femtosecond laser mainly breaks Nb—O bonds.Along the incident polarization angle of 90°,more number of Nb—O bonds are easily broken,thereby reducing the damage threshold in that polarization direction.This study contributes to an in-depth understanding of the ablation of ultrafast lasers on LN crystal surfaces and has an important reference value for the laser preparation of functional devices on LN crystal surfaces.
关键词
飞秒激光/铌酸锂/偏振/损伤阈值/第一性原理Key words
femtosecond laser/lithium niobate/polarization/damage threshold/first principles引用本文复制引用
基金项目
国家自然科学基金(51975017)
北京市教委重点科研项目(KZ202110005012)
北京市自然科学基金-海淀联合基金重点(L222011)
出版年
2024
NETL
NSTL
万方数据