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采用二阶Ca离子作为电荷补偿离子由提拉法生长出了具有高光学质量的调Q开关晶体Cr^4 :YAG并对该晶体进行了退火研究。吸收光谱测量表明原生态晶体中已有少量Cr^4 离子存在。晶体经空气中退火后Cr^4 离子浓度和1.06μm处的吸收系数均显著提高,晶体生长和退火实验显示出晶体中Cr^4 离子的浓度不仅取决于掺杂的Cr^3 离子的浓度,而且同晶体中的Ca/Cr浓度比密切相关。 相似文献
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用提拉法生长了质量优良的大尺寸Yb :YAG晶体 ,在室温下测量了它的 2 0 0~ 30 0 0nm的吸收光谱。在 2 0 0~ 390nm范围内 ,晶体的吸收来自基质YAG ;在 390~ 30 0 0nm范围内 ,仅有Yb3 + 的特征吸收。Judd Ofelt理论计算的结果表明 ,(2 4at% )Yb :YAG的电偶极子的吸收、发射振子强度分别为 3 5 8× 10 -6,4 77× 10 -6,吸收、发射跃迁几率分别为每秒 879,1171。磁偶极子的吸收、发射振子强度分别为 3 32×10 -7,4 4 3× 10 -7,吸收、发射跃迁几率分别为每秒 82 ,10 9;2 F5/ 2 能级寿命为 781μs。 相似文献
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Influence of Gamma-Ray Irradiation on Absorption and Fluorescent Spectra of Nd:YAG and Yb:YAG Laser Crystals 总被引:1,自引:0,他引:1 下载免费PDF全文
We investigate the influence of gamma-ray irradiation on the absorption and fluorescent spectra of Nd^3+:Y3A15 O12 (Nd: YAG) and Yb^3+ : Y3A15 O12 (Yb: YAG) crystals grown by the Czochralski method. Two additional absorption (AA) bands induced by gamma-ray irradiation appear at 255nm and 340nm. The former is contributed due to Fe^3+ impurity, the latter is due to Fe^2+ ions and F-type colour centres. The intensity of the excitation and emission spectra as well as the fluorescent lifetime of Nd:YAG crystal decrease after the irradiation of 100 Mrad gamma-ray. In contrast, the same dose irradiation does not impair the fluorescent properties of Yb:YAG crystal. These results indicate that Yb: YA G crystal possesses the advantage over Nd: YA G crystal that has better reliability for applications in harsh radiant environment. 相似文献
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