飞秒激光对氟化镁烧蚀机理研究  

Mechanism of femtosecond laser-induced damage in magnesium fluoride

作　　者：李成斌[1] 贾天卿[1] 孙海轶[1] 李晓溪[1] 徐世珍[1] 冯东海[1] 王晓峰[1] 葛晓春[1] 徐至展[1] 

机构地区：[1]中国科学院上海光学精密机械研究所强场激光物理国家重点实验室,上海201800

出　　处：《物理学报》2006年第1期217-220,共4页Acta Physica Sinica

基　　金：国家重点基础研究发展规划项目(批准号:G1999075200)资助的课题~~

摘　　要：用扫描电镜(SEM)研究了氟化镁在800nm超短脉冲激光作用下的单枪表面烧蚀形貌.根据烧蚀斑面积与激光脉冲能量间的对数关系,测得烧蚀阈值与激光脉宽的关系曲线(55—750fs).计算了导带电子的双光子吸收,改进了多速率方程模型,很好地解释了实验结果.Single-shot damage morphology of magnesium fluoride induced by femtosecond laser pulse was studied with scanning electron microscope （SEM）. The laser pulses used were 800 nm central wavelength. By the linear relationship between the area of damage spot and the logarithm of the laser energy, we measured the dependence of damage threshold on the pulse duration ranging from 55 femtosecond （fs） to 750 fs. We have calculated the two-photon absorption in the conduction band and improved the multiple-equation model （ Phys. Rev. Lett. 92 187401, 2004）. The experimental results are well explained by our model.

关 键 词：飞秒激光 氟化镁 烧蚀机理 双光子吸收 

分 类 号：TN249[电子电信—物理电子学]