Temperature-dependent stimulated emission cross section and concentration quenching in highly doped Nd3+:YAG crystals
Temperature-dependent stimulated emission cross section and concentration quenching in highly doped Nd3+:YAG crystals
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DOI：
10.1002/pssa.200421122
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发表时间：
2005-10-01
影响因子：
2
通讯作者：
Ueda, K
中科院分区：
文献类型：
--
作者：
Dong, J;Rapaport, A;Ueda, K
报道了掺1、2和3at%Nd3+的Nd3+晶体在70~300K温度范围内的光谱性质(吸收光谱、发射光谱、受激发射截面和辐射寿命)的测量结果，并用F-L公式测定了这些晶体在不同温度下的受激发射截面。根据贾德-奥菲尔理论，用室温吸收光谱计算了F-4(3/2)->；I-4(3/2)受激发射截面和4F，辐射寿命。随着温度的降低，发射截面增大，而所有样品的发射寿命保持不变。不同掺杂晶体的受激发射截面随温度的变化规律与先前的预测符合得很好。还讨论了高掺杂的NdYAG光的浓度猝灭效应。尽管高掺杂的Nd：YAG晶体存在浓度猝灭现象，但它们仍然是高功率微芯片固体激光器的有效激光材料。(C)2005年威利-VCH Verlag GmbH&Co.KGaA，温海姆。
Measurements are reported of the spectroscopic properties (absorption and emission spectra, stimulated emission cross section, and radiative lifetime) of Nd:YAG crystals doped with 1, 2 and 3 at% Nd3+ in the temperature range between 70 and 300 K. The stimulated emission cross sections for these crystals were determined using the Fiichtbauer-Ladenburg (F-L) formula at each different temperature. The absorption spectra at room temperature were used to calculate the F-4(3/2) -> I-4(3/2) stimulated-emission cross section and the 4 F,, radiative lifetime according to Judd-Ofelt theory. As the temperature decreases the emission cross section increases, while the emission lifetime remains constant for all the samples. The temperature dependences of the stimulated emission cross sections for the differently doped crystals are in good agreement with earlier predictions. The concentration quenching effect in highly doped Nd: YAG was also addressed. Although there is concentration quenching in the highly doped Nd: YAG crystals, they are still promising efficient laser materials for high-power microchip solid-state lasers. (c) 2005 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.