【摘要】 采用溶胶-凝胶法与高温熔融工艺相结合的方法制备了Yb³⁺掺杂的石英玻璃,研究了Yb₂O₃含量一定（0.3 mol%）时,不同Al₂O₃含量（Al/Yb=4、8、12）对行英玻璃物理及光谱特性的影响。在Yb³⁺、Al³⁺共掺的石英玻璃中,随着A1₂O₃含量增加,样品的折射率和Yb³⁺的荧光寿命提高,吸收截面以及受激发射截面降低。YA2玻璃（0.3Yb₂O₃-2.4A1₂O₃-97.3SiO₂）得到最大的σ_emi×τ_f直（0.75 pm²×ms）,比FP玻璃（0.60 pm²×ms）高^[15]。Al³⁺离子进入玻璃网络结构,能够降低-OH的含量,提高Yb³⁺的荧光寿命。当Al/Yb=12时,得到最长的荧光寿命0.96ms和最低的-OH吸收系数1.13 cm^-1。这些结果表明,适当含量的A1₂O₃有益于Yb³⁺石英玻璃的光谱特性以及在光纤激光器方面的应用。更多还原

【Abstract】 Yb³⁺-doped silica glasses with constant Yb₂O₃ of 0.3 mol%and three different Al/Yb mole ratios（4,8,12） fabricated by Sol-Gel method were investigated.The refractive index and Yb³⁺ lifetime of glasses increases with the increase of Al₂O₃ content.Both of absorption cross-section and stimulated emission cross-section decrease with the increase of the Al³⁺ ions content.YA2glass（0.3Yb₂O₃-2.4Al₂O₃-97.3SiO₂） shows the best value of σ_emi×τ_b（0.75 pm²× ms） which is higher than FP glass（0.60 pm² ×ms）1’51.The Al³⁺ ions in glass network could reduce the content of OH groups,and result in a higher fluorescence lifetime.The longest fluorescent lifetime of 0.96 ms and lowest absorption coefficient of-OH of 1.13 cm^-1 were obtained in glass with AUYb mole ratio of 12.The results indicate that Yb³⁺-doped silica glass with proper amount of Al₂O₃ content will be beneficial for spectroscopic properties and fiber laser application.更多还原