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Engineering rare-earth-doped heavy metal oxide glasses for 2-5 μm lasers

机译:用于2-5μm激光器的工程稀土掺杂重金属氧化物玻璃

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The electronic states in trivalent rare-earth ions offer an excellent opportunity for designing efficient fibre and bulk lasers for atmospheric remote sensing and LIDAR technology. The first part of this review article focuses on engineering passive fibres for 2-5 μm transmission: The fabrication of single-mode tungsten tellurite optical fibres from high purity bulk glass rods is described. Fibres with a numerical aperture of 0.1 and core diameter of 10±2 μm have been drawn using suction and rod-in-tube techniques of fibre preform fabrication. Losses of 2.3 dBm~(-1) at 974 nm have been measured. These fibres are of interest for use as passive transmission fibre or active fibres for lasing in the 2-5 μm spectral region. The use of heavy metal oxides in the fabrication of glass leads to extended infrared transmission. In the 2nd part of the review we compare the slope efficiencies of Tm~(3+) and Tm~(3+)/Ho~(3+) doped glasses and fibres for 1950-2080 nm lasers using a range of pumping schemes in tellurite and germanium oxide hosts. We also explain the importance of choosing 1950-2080 nm tunable lasers as a pump source for stimulated emission at longer wavelengths.
机译:三价稀土离子中的电子态为设计用于大气遥感和LIDAR技术的高效光纤和体激光器提供了绝佳的机会。这篇综述文章的第一部分重点介绍了用于2-5μm传输的工程无源光纤:描述了用高纯度块状玻璃棒制造单模亚碲酸钨光纤。数值孔径为0.1且纤芯直径为10±2μm的纤维已使用吸力和棒内管预制棒技术进行拉伸。测量了974 nm处的2.3 dBm〜(-1)损耗。这些光纤被用作被动传输光纤或主动光纤,用于在2-5μm光谱范围内发射激光。在玻璃制造中使用重金属氧化物会导致红外传输的延长。在第二部分中,我们比较了Tm〜(3+)和Tm〜(3 +)/ Ho〜(3+)掺杂的玻璃和光纤对于1950-2080 nm激光器的斜率效率,采用了多种泵浦方案亚碲酸盐和氧化锗主体。我们还解释了选择1950-2080 nm可调激光器作为泵浦光源以在更长波长激发光的重要性。

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