Color tunability with temperature and pump intensity in Yb3+/Tm3+ codoped aluminosilicate glass under anti-Stokes excitation.
Color tunability with temperature and pump intensity in Yb3+/Tm3+ codoped aluminosilicate glass under anti-Stokes excitation.
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DOI：
10.1063/1.3457926
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发表时间：
2010-07
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通讯作者：
W. F. Silva;G. S. N. Eliel;P. V. dos Santos;M. T. de Araujo;M. Vermelho;P. T. Udo;N. Astrath;M. B
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文献类型：
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作者：
W. F. Silva;G. S. N. Eliel;P. V. dos Santos;M. T. de Araujo;M. Vermelho;P. T. Udo;N. Astrath;M. B
在1.064微米的反stokes激发下，Yb(3+)/Tm（3+）共掺低硅钙铝硅酸盐（LSCAS）玻璃表现出泵浦和热致颜色可调性。研究了泵浦强度和样品温度对上转换发射的影响，主要是对颜色可调性（800 ~ 480 nm）的影响。结果表明，当泵浦强度从27 kW/cm(2)增加到700 kW/cm(2)，样品温度从296 K增加到577 K时，在800/480 nm的比值下，泵浦强度降低了20倍，样品温度降低了3倍。这些随泵浦强度和温度的变化（480 nm的发射比800 nm的发射强烈增加）归因于LSCAS系统中发生的几个有效过程（Yb（3+）—>Tm（3+）能量传递过程，Yb（3+）和Tm（3+）激发态的容易饱和，以及辐射发射）。除了这些分配，温度依赖主要分配给温度依赖的有效吸收截面的镱敏化剂通过所谓的多声子辅助的反斯托克斯激发过程。理论分析和实验数据的拟合提供了定量信息。
Pump and thermally induced color tunabilities were demonstrated in Yb(3+)/Tm(3+) codoped low silica calcium aluminosilicate (LSCAS) glass under anti-Stokes excitation at 1.064 microm. The effects of pump intensity and sample's temperature on the upconversion emissions and mainly on the color tunabilities (from 800 to 480 nm) were investigated. The results revealed a 20- and a threefold reductions at 800/480 nm ratio as, respectively, the pump intensity and sample's temperature were increased from 27 to 700 kW/cm(2) and from 296 to 577 K. These behaviors with pump intensity and temperature (a strong increase of the 480 nm emission in comparison with the 800 nm one) were attributed to the several efficient processes occurring in the LSCAS system (Yb(3+)-->Tm(3+) energy-transfer processes, easy saturations of the Yb(3+) and Tm(3+) excited states, and radiative emissions). Besides these assigns, the temperature dependence is mainly assigned to the temperature-dependent effective absorption cross section of the ytterbium sensitizer through the so-called multiphonon-assisted anti-Stokes excitation process. Theoretical analyses and fits of the experimental data provided quantitative information.