Preparation of Semiconductor Doped Nonlinear Optical Glasses With High Nonlinear Susceptibility

为了获得具有高三阶非线性极化率的非线性光学玻璃，用溶胶-凝胶法制备了含有大量球形半导体颗粒的钠硼硅酸盐玻璃，其最佳凝胶处理温度为400 ℃ ~ 200 ℃，颗粒直径约为10 nm。在120 ~ 150 ℃范围内，H_2S处理CdO转化为CdS的最佳温度范围为120 ~ 150 ℃，在此条件下制备的玻璃的非线性极化率比以往研究中制备的玻璃的非线性极化率高得多。在40 ℃的醋酸铅饱和水溶液中控制前驱体硅酸铅凝胶的粒度分布，冷却至30 ℃，然后用丙酮处理凝胶。由此形成的醋酸铅颗粒的尺寸分布很窄，并且通过随后的处理转化为氧化铅和硫化物而保持不变，这表明将类似的方法应用于醋酸镉体系的凝胶可以进一步改善CdS颗粒的尺寸分布，从而改善CdS掺杂玻璃的非线性极化率。

For the purpose of obtaining nonlinear optical glasses with high third order non-linear susceptibility, the preparation of sodium-borosilicate glasses containing a large number of spherical semiconductor particles of diameter about 10nm by sol-gel process has been elaborated.The optimum temperature of the treatment of gels for the oxidation of cadmium acetate precursor to cadmium oxide was in the range 400ﾟ-420ﾟC.The most suitable temperature for the treatment by hydrogen sulfide to CdO into CdS was found in the range 120ﾟ-150ﾟC.The nonlinear susceptibility of the glass prepared under these conditions was much higher than those of glasses prepared in the previous study.The preparation of PbS-doped nonlinear optical glasses by sol-gelprocess has benn conducted fucusing the control of particle size distridution of precursor lead silicate gels in a saturated aqueous solution of lead acetate at 40ﾟC and cooling down to 30ﾟC, followed by the treatment of the gel with acetone. The size distribution of thus formed lead acetate particles was quite narrow and remained unchanged by the subsequent treatments for the conversion into lead oxide and sulfide, suggesting that the size distribution of CdS particle, and therefore the nonlinear susceptibility of CdS-doped glasses, can befurther improved by applying the similar mathod to gels of cadmium acetate system.