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)

作　　者：温亚楠 林真源 季凌飞[1,2,3] Wen Yanan;Lin Zhenyuan;Ji Lingfei(School of Physics and Optoelectronic Engineering,Beijing University of Technology,Beijing 100124,China;Key Laboratory of Trans-Scale Laser Manufacturing Technology of Ministry of Education,Beijing University of Technology,Beijing 100124,China;Beijing Engineering Research Center of Laser Applied Technology,Beijing 100124,China)

机构地区：[1]北京工业大学物理与光电工程学院,北京100124 [2]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 [3]北京市激光应用技术工程技术研究中心,北京100124

出　　处：《激光与光电子学进展》2024年第11期144-149,共6页Laser & Optoelectronics Progress

基　　金：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)。

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。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 

分 类 号：TN249[电子电信—物理电子学]