溶胶凝胶法制备的掺铥石英玻璃光谱性质及光纤激光性能

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用溶胶凝胶法制备了摩尔百分比为0.3Tm2O3-0.3xAl2O3- (100-0.3-0.3x)SiO2 (x=8, 10, 15, 20)的一系列铥掺杂石英(ATS)玻璃。研究了样品的光谱性质,1811nm处最大发射截面为6.39×10-21 cm2,最长荧光寿命为645 μs。样品的最低OH含量为10.5×10-6。采用管棒法制备了光纤预制棒,采用组分为0.3Tm2O3-4.5Al2O3-95.2SiO2的玻璃作为纤芯,八边形的纯石英管作为内包层,用紫外固化剂作为外包层拉制双包层光纤。测量了光纤的激光性质,在66 cm长的光纤中得到了最大为1.23 W的激光输出,斜率效率为11.7%,激光阈值为6.07W,激光中心波长为1952 nm。
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