【摘要】 利用三阶光学非线性特性较小的改进型硼硅酸盐玻璃作为基质和对比玻璃,用相对温度较低的固相熔融法制备了两种掺Ho3+玻璃。在调Q纳秒Nd∶YAG强激光脉冲下,使用闭孔Z-扫描技术研究了该硼硅酸盐基质玻璃及其掺Ho3+玻璃的三阶光学非线性特性。发现基质玻璃具有正的三阶非线性折射系数和非线性吸收系数,属于自聚焦反饱和吸收型的光学介质;而随着Ho3+的掺入,该硼硅酸盐玻璃的三阶非线性折射和吸收系数较基质玻璃有明显的增大,远高于一个量级。用开孔Z-扫描实验与光限幅实验进一步验证了掺Ho3+玻璃具有较高的三阶非线性吸收系数。所有的实验结果表明Ho3+的掺入提高了硼硅酸盐玻璃在532 nm处的激光防护性能。更多还原

【Abstract】 Using an improved borosilicate glass with small third-order optical nonlinearities,i.e.,nonlinear refractive index(NLRI) and nonlinear absorption coefficient(NLAC),as the matrix and comparative glass,two types of Ho3+-doped glass were prepared with a solid-phase smelting process at a relatively low temperature.Their third-order optical nonlinearities were measured by the closed-aperture Z-scan technique using nanosecond laser pulsing at 532 nm.It was found that the matrix glass possessed a positive third-order NLRI and a positive third-order NLAC,and both the third-order NLRI and NLAC of Ho3+-doped glasses were one order larger than those of the matrix glass,respectively.Also,an open-aperture Z-scan experiment and an optical limiting experiment further demonstrated that the Ho3+-doped glasses had a high third-order NLAC.All the experimental results showed that this Ho3+-doped glasses were provided with a good protection performance for the 532 nm-laser.更多还原