【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。更多还原

【Abstract】 Fifteen rare-earth (RE) elements with 1.5 mol% concentration are doped into CaO-SiO2-B2O3-Al2O3-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 coefficient is that of Nd3+-doped glass,β=6.55×10-11 m/W.Optical limiting experiments further determine that type I glasses can exhibit the laser protection property below the power density 20×1012 W/m2 and type Ⅱ glasses may play the optical limiting role at power densities more than 20×1012 W/m2 but below 30×1012 W/m2.更多还原