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为进一步揭示硫系玻璃基掺Er~(3+)微结构光纤对于中红外波段信号的放大特性,采用熔融淬火法研制了Er~(3+)离子掺杂的Ga_5Ge_(20)Sb_(10)S_(65)硫系玻璃,测试了玻璃样品的吸收光谱和2.7μm波段荧光光谱,利用Judd-Ofelt和Futchbauer-Ladenburg理论分别计算得到了Er~(3+)离子的辐射跃迁概率、辐射寿命以及2.7μm波段受激发射截面.在此基础上,建立了一个980 nm抽运下该玻璃基掺Er~(3+)微结构光纤2.7μm波段中红外信号的放大模型,理论上研究了其作为2.7μm波段中红外信号增益介质时的光放大特性.结果显示,硫系玻璃基掺Er~(3+)微结构光纤具有优异的高增益和宽带放大品性.在200 mW抽运功率激励下的100 cm光纤长度上,最大小信号增益超过了40 dB,高于30 dB信号增益的放大带宽达到了120 nm(2696—2816 nm).研究表明,Ga_5Ge_(20)Sb_(10)S_(65)硫系玻璃基掺Er~(3+)微结构光纤是一种理想的可应用于2.7μm波段中红外宽带放大器的增益介质.
In order to further reveal the amplifying characteristics of the Er 3+ ion doped Ga ~ 5Ge 20 Sb 10 nanoparticles by the melt quenching method, S_ (65) chalcogenide glasses were used to measure the absorption spectra of glass samples and the fluorescence spectrum of 2.7μm. The transition probability of Er ~ (3+) ions, the radiation lifetime and the lifetime of Er 3+ ions were calculated by Judd-Ofelt and Futchbauer- 2.7μm band, a model of amplification of 2.7μm mid-infrared signal of the glass-doped Er 3+ microstructure fiber under 980 nm pumping was established. In theory, The results show that the sulfur-doped glass-based Er 3+ -doped microstructured fiber has excellent high-gain and wide-band amplifying properties. Under the excitation of 200 mW pumping power, The maximum gain of small signal exceeds 40 dB at 100 cm fiber length, and the amplification bandwidth of signal gain above 30 dB reaches 120 nm (2696-2816 nm). The results show that Ga_5Ge_ (20) Sb_ (10) S_ (65) ) Thulium-based glass-doped Er3 + microstructured optical fiber is an ideal material that can be applied in the 2.7μm band Infrared wideband amplifier gain medium.