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铋掺杂锗酸盐玻璃超宽带近红外发光性质及机理

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Abstract:

采用传统的高温熔融法制备了80GeO2–20RO(R=Ca,Sr,Ba)掺铋锗酸盐玻璃。研究了铋掺杂锗酸盐玻璃超宽带近红外发光性质,探讨了铋离子掺杂玻璃超宽带发光机理。结果表明在808nm激光激发下,铋掺杂锗酸盐玻璃随着碱土金属离子半径增加,中心波长为1300nm的发射强度逐渐降低;在690nm激光激发下,铋掺杂锗酸盐玻璃的近红外发射覆盖从900nm到2000nm波段但不呈现正态分布,荧光半高宽达428nm。随着碱土金属离子半径的增加,其近红外发射中心位置逐渐向长波方向移动,推测近红外发光可能源于两种不同形式铋的发光中心。铋掺杂的锗酸盐玻璃具有良好的光学性能,较宽的荧光半高宽,将成为未来超宽带光纤放大器的增益介质。

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