摘要
通过改变辐照激光脉冲数、激光的平均功率、显微镜物镜倍数/数值孔径等研究微皇冠结构形成与加工条件的关系,并借鉴激光熔池形成和液滴溅射的模型对其进行理论分析。当激光脉冲数达到一定数量后,烧蚀区域会出现微皇冠结构。烧蚀区域尺寸的改变是由于形成的液体区域中热毛细作用和化学毛细作用共同所致;微皇冠结构溅射个数的改变是由于形成的气体因多光子吸收体积迅速膨胀所致。
A high repetition rate femtoseeond laser was used to irradiate a europium complex film, and a self-organizing symmetrical structure-like droplet was successfully induced which we called micro crown structure. In order to research the rela- tionship between micro-crown formation and machining condition, we changed laser pulses, average power, and numerical aper- ture of microscope. We analyzed the experiment results theoretically by referring to laser molten pool model and droplets sputte- ring model. The micro-crown structure appeared in femtoseeond laser irradiation region while the pulses reached a certain value, Irradiation region size change was caused by thermo-capillary forces and chemical-capillary forces in liquid area. The sputter change was due to rapid gas expansion in gaseity area caused by multiphoton absorption.
出处
《强激光与粒子束》
EI
CAS
CSCD
北大核心
2014年第8期73-76,共4页
High Power Laser and Particle Beams
基金
国家自然科学基金项目(11174195)
上海高校选拔培养优秀青年教师科研专项基金项目(ZZSD12118)
关键词
自组织
铕复合物薄膜
微皇冠
飞秒激光
微加工
self-organize
europium complex film
micro-crown
femtosecond laser
micro-machining
