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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 kinds of single rare earth doped CaO-SiO2-B2O3-Al2O3-Na2O borosilicate glass with a concentration of 1.5mol% were prepared by high temperature melting method. The laser protective properties of 532nm intense laser were studied by three experiments. By testing transmission spectra, it was found that only 3 kinds of laser glass (Nd, Er and Ho-doped laser glass, called I-type glass) has a significant absorption structure near 532 nm. Therefore, it is expected that Class I glass has near 532 nm The third-order optical nonlinear absorption coefficient is greater than the other 12 types (called Type II glass). The above-mentioned expectation was confirmed by the open-hole Z-scanning technique and the maximum third-order nonlinear absorption coefficient β of Nd-doped glass was 6.55 × 10-11m / W. The optical limiting experiment further confirms that the type I laser glass exhibits 532 nm laser protection under 20 × 10 12 W / m 2 while the protective effect of the type II glass ranges from 20 to 30 × 10 12 W / m 2.