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建立了半导体抽运的高功率掺镱双包层光纤放大器实验系统,对放大器中的频率上转换发光现象进行了理论和实验研究,分析认为实验中由光纤侧面和两端观测到的绿色荧光是处于激发态的Yb3+相互作用,同时湮没而产生的合作荧光。分别对光纤放大器信号端和抽运端输出的荧光谱进行了测量,将实验谱线与理论计算得到的合作发光谱进行了对比分析。研究了信号光和放大自发辐射对上转换发光的影响,根据速率方程推导出荧光强度与抽运功率之间的理论关系表达式,同时通过实验获得了荧光强度与抽运功率的关系曲线。
A high-power Ytterbium-doped double-clad optical fiber amplifier experiment system for semiconductor pumping was set up. Theoretical and experimental studies on the frequency up-conversion luminescence in the amplifier were carried out. It is considered that the green fluorescence observed from both sides and ends of the optical fiber in the experiment is In the excited state of Yb3 + interaction, while annihilation resulting fluorescence cooperation. The fluorescence spectra of the output signal and the output of the fiber amplifier were measured respectively. The experimental spectra were compared with the theoretical emission spectra. The influence of signal light and amplified spontaneous emission on the upconversion luminescence was studied. The theoretical expression of the relationship between fluorescence intensity and pumping power was deduced according to the rate equation. At the same time, the relationship between fluorescence intensity and pumping power was obtained.