新型掺铒钆硼硅酸盐玻璃的制备和光学性质的研究

Preparation and Optical Properties of Er^(3+)-Doped Gadolinium Borosilicate Glasses

用高温熔融法制备了成分为Gd2O3,SiO2,B2O3和Na2O的新型玻璃体系,探索了该玻璃体系的成玻范围,发现该系统在B2O3:20%以上,SiO2:0～50%,Gd2O3:0～30%的范围内均可形成完全透明的玻璃。在Gd2O3:30%,B2O3:60%和SiO2:60%,B2O3:30%两个组分附近时玻璃轻微失透。除此以外,在其他组分实验上没有得到玻璃。根据差热分析的数据,计算得到的玻璃析晶倾向参数β在0.32～1.76之间,说明含10%Gd2O3的钆硼硅酸盐玻璃具有较强的形成能力;利用McCumber理论计算出样品的吸收和受激发射截面,并从玻璃1.5μm的吸收光谱出发拟合出了J O参数,进而计算了Er3+离子各相关能级的理论振子强度、实验振子强度和自发辐射速率等参数。同时,用Er3+离子1 5μm发射光谱的半高全宽与其峰值发射截面的乘积值对含10%Gd2O3钆硼硅酸盐玻璃1.5μm发射的增益带宽作出了表征,结果表明,含10%Gd2O3玻璃体系的FWHM×σepeak值均大于已有报道的硅酸盐、磷酸盐和锗酸盐玻璃,其中最大值和氧氟硅酸盐玻璃的相差不多。

Er^(3+)-doped Gd_2O_3-SiO_2-B_2O_3-Na_2O glasses were prepared by the technique of high-temperature melting at different temperatures. Formation range of glass of Gd_2O_3-SiO_2-B_2O_3 system was experimentally obtained. It is found that the glass phase can be formed only when the content of SiO_2 is 0%～50%, Gd_2O_3 is 0%～30% and B_2O_3 is above 20% in this glass system. The glass can also be obtained but becomes translucent at the contents of 60% SiO_2 and 30% Gd_2O_3, or at the contents of 60% SiO_2 and 30% B_2O_3. There is no glass phase formed in other glass components. Glass forming ability for Gd_2O_3 content of 10%, was characterized by the value of β, the parameter of crystallization tendency, which is 0.32～1.76, obtained from the differential thermal analysis. The absorption and emission cross section, the J-O parameters Ω_t (2, 4, 6) and radiative transition probabilities were calculated by using the theory of McCumber and Judd-Ofelt. The emission properties at 1.5 μm of the samples are discussed with the product of full width at half maximum and stimulated emission cross section. It can be seen that the value of the FWHM×σ_e^(peak) product in the prepared glass is more than those of germanate, silicate and phosphate glasses. Furthermore, the maximum value of the product among these glasses reported in this work is close to that of oxyfluoride silicate glass. Therefore, the Er^(3+)-dopedgadolinium borosilicate glass prepared in our lab. is a promising candidate for broadband erbium doped fiber amplifiers.