飞秒激光辐照K9玻璃引起的暗化和折射率变化  

Femtosecond Laser Induced Darkening and Refractive Index Change in K9 Glass

作　　者：周秦岭[1] 刘丽英[2] 徐雷[2] 王文澄[2] 邱建荣[3] 朱从善[3] 干福熹[1] 

机构地区：[1]中国科学院上海光学精密机械研究所,上海201800 [2]复旦大学光科学与工程系先进光子学材料与器件国家重点实验室,上海200433 [3]中国科学院上海光学精密机械研究所中日光子技术国际合作实验室,上海201800

出　　处：《中国激光》2005年第1期119-122,共4页Chinese Journal of Lasers

基　　金：国家自然科学基金(10074011);国家基础研究重大项目前期研究专项(2001CCA04600)资助课题

摘　　要：对不同辐照条件下近红外飞秒激光在K9玻璃内部诱导产生的暗化现象和永久性折射率改变进行了实验研 究。通过辐照前后的显微镜图片、吸收光谱、电子自旋共振谱(ESR)以及激光衍射实验,分析了K9玻璃中暗化现 象产生的微观过程,发现暗化是由诱导产生的空穴型色心引起的。暗化程度和折射率改变随激光强度、扫描速度、 扫描行间距变化而变化。光致色心的形成与非线性电离有关。对折射率永久性改变进行了简单说明,其机理仍在 探索中。Femtosecond laser induced darkening and permanent refractive index changes in K9 glass under different radiation conditions were experimentally studied. The micro-process of darkening generation in K9 glass was analyzed depending on the results of microscope photograph, absorption spectra, electron spin resonance spectra (ESR), and laser diffraction. It was found that hole-trapped color centers give rise to the darkening generation. Darkening and refractive index change varied with laser intensity, scan speed, and line interval. Nonlinear ionization enhanced color center formation. Permanent refractive index changes were explained simply. The mechanism was still under discussion.

关 键 词：材料 暗化 折射率改变 飞秒激光 K9玻璃 非线性电离 

分 类 号：TQ171.734[化学工程—玻璃工业] O434.14[化学工程—硅酸盐工业]