飞秒激光导致透明介质的结构改变  

Structural Damage in Transparent Materials Induced by Femtosecond Laser

作　　者：刘青[1] 汪建军[1] 

机构地区：[1]浙江万里学院应用物理研究所,宁波315100

出　　处：《西安工业大学学报》2008年第6期516-520,共5页Journal of Xi’an Technological University

基　　金：宁波市自然科学基金资助项目(2006A610022)

摘　　要：超短脉冲激光是对物质进行加工、处理的有力工具.使用脉冲宽度150 fs的不同能量的800 nm激光脉冲,在不同数值孔径的聚焦条件下,对各向同性的光学物质(熔融石英和聚甲基丙烯酸甲酯(PMMA))进行了单个激光脉冲所形成的光损伤实验研究.检测了激光脉冲在这两种介质中的能量损伤阈值和形成的损伤位点的形态.研究了高强度飞秒激光脉冲在熔融石英和PMMA介质体内所形成的几种结构改变,从局部的小折射率改变到形成微爆结构.得出了PMMA比熔融石英更适合用作飞秒激光的三维光存储材料的结论.讨论了飞秒激光脉冲与透明介质的非线性相互作用.Ultra-short laser is a powerful tool tor processing varieties of material,The damage threshold and damage morphology of isotropic optical material （fused silica and PMMA）have been investigated by 800nm, 150fs laser pulses, in different numerical aperture （NA） objective, different pulse energy and focus on location. The damage structural change, from small refractive index changes to microexplosion structure in PMMA and fused silica induced by high intensity femtosecond laser is studied. The conclusion is obtained that PMMA is better than fused silica for material of three dimensions optical storage using femtosecond laser. Nonlinear interactions of femtosecond laser and transparent material are discussed.

关 键 词：飞秒激光 透明介质 损伤 阂值 

分 类 号：TN249[电子电信—物理电子学]