摘要
采用高温熔融法制备了15种1.5mol%浓度的单一稀土掺杂CaO-SiO2-B2O3-Al2O3-Na2O硼硅酸盐玻璃样品,并通过3种实验研究了它们的532nm强激光的激光防护特性。通过测试透射谱发现,只有3种激光玻璃(Nd、Er和Ho掺杂激光玻璃,称其为I类玻璃)的透射谱在532nm附近有显著的吸收结构,因而预期I类玻璃在532nm附近有比其它12种(称其为Ⅱ类玻璃)大的三阶光学非线性吸收系数。通过开孔Z-扫描技术实验证实了上述预期,并得到Nd掺杂玻璃具有最大的三阶非线性吸收系数β为6.55×10-11m/W。通过光限幅实验进一步地确认I类激光玻璃在20×1012W/m2以下就能展示532nm激光防护作用,而Ⅱ类玻璃的防护作用范围为20～30×1012W/m2。
Fifteen rare-earth （RE） elements with 1. 5 mol% concentration are doped into CaOSiO2- B2 O3-Al2 O3-Na2O borosilicate glasses, respectively, to form RE doped borosilicate glasses, and their 532 nm nanosecond laser protection properties are studied through three kinds of experiments. By recording their transmission spectra,we can find that only three spectra of Nd-, Er-and Ho-doped glasses （called type I glasses） have remarkable absorptive structure in the vicinity of 532 nm,and therefore we anticipate that type Ⅰ glasses may possess larger third order optical nonlinear absorption coefficient than the other twelve kinds of RE doped borosilicate glasses （called type Ⅱ glasses）. The open-aperture Z-scan experiments confirm the above-mentioned anticipation and show that the largest nonlinear absorption co- efficient is that of Nd^3＋ doped glass,fix 6.55 × 10^11 m/W. Optical limiting experiments further deter- mine that type I glasses can exhibit the laser protection property below the power density 20 × 10^12 W/ m^2 and type II glasses may play the optical limiting role at power densities more than 20 × 10^12 W/m^2 but below 30×10^12 W/m^2.
出处
《光电子．激光》
EI
CAS
CSCD
北大核心
2009年第5期633-636,共4页
Journal of Optoelectronics·Laser
基金
国家“863”计划资助项目(2003AA311010)
国家“973”计划资助项目(2003CB314905)
国家自然科学基金重点资助项目(60637010)
关键词
激光保护
硼硅酸盐玻璃
稀土掺杂
光限幅
laser protection
borosilicate glass
rare earth doping
optical limiting
