为了研究Nd3+的摩尔分数对1.3μm处荧光的影响,采用常规的熔融方法制备了钕离子掺杂的0.70TeO2-(0.30-x)WO3-xNd2O3 (摩尔分数x为0.001,0.003,0.005,0.007,0.01)玻璃系统,得到了Nd3+ 1.3μm荧光光谱,同时还研究了荧光峰值波长的有效线宽和受激发射截面与Nd3+摩尔分数的关系。根据Dexter能量转移理论计算了Nd3+在碲酸盐玻璃中能量转移参量Cd,d(4F3/2,4I9/2→4I9/2,4F3/2)和Cd,a(4F3/2,4I9/2→4I15/2,4I15/2和4F3/2,4I9/2→4I13/2,4I15/2)值和相应发生浓度猝灭的临界距离Rd,d和Rd,a。结果表明,随着Nd3+的掺杂摩尔分数增加,荧光强度也逐渐增加,到0.005时达到最大;随后当Nd3+的摩尔分数大于0.005时,荧光强度逐渐降低。

In order to study the effect of Nd3+ concentration on the fluorescence property at 1.3μm,Nd2O3 -doped 0.70TeO2-(30-x)WO3-xNd2O3(mole fraction x is 0.001,0.003,0.005,0.007,0.010) tellurite glass was prepared by means of the conventional melt-quenching method.The fluorescence spectra were obtained.The dependence of the effective bandwidth and the stimulated emission cross-sections of 4F3/2→4I13/2 transition on Nd3+ concentration was studied.Based on the electric dipole-dipole interaction theory,the interaction parameters,Cd,d,for the energy migration rate 4F3/2,4I9/2→4I9/2,4F3/2 and Cd,a,for cross relaxation rate 4F3/2,4I9/2→4I15/2,4I15/2,and/or 4F3/2,4I9/2→4I13/2,4I15/2 in tellurite glass are about 10.6×10-40cm6/s and 2.80×10-40cm6/s,respectively.The result shows that the fluorescence intensity drastically increases and has a maximum around 0.005(mole fraction) Nd2O3 and decreases with increase of the Nd2O3 concentration.