Thermal and Optical Properties of ${hbox {Yb}}^{3+}$- and ${hbox {Nd}}^{3+}$-Doped Phosphate Glasses Determined by Thermal Lens Technique
Thermal and Optical Properties of ${hbox {Yb}}^{3+}$- and ${hbox {Nd}}^{3+}$-Doped Phosphate Glasses Determined by Thermal Lens Technique
复制标题
通过热透镜技术测定 ${hbox {Yb}}^{3 }$- 和 ${hbox {Nd}}^{3 }$-掺杂磷酸盐玻璃的热学和光学性质
DOI：
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发表时间：
2007
影响因子：
2.5
通讯作者：
T. Catunda
中科院分区：
文献类型：
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作者：
D. N. Messias;Carlos Jacinto;M. J. V. Bell;T. Catunda
在本工作中，我们利用热透镜(TL)技术研究了离子掺杂磷酸盐玻璃的热学和光学性质。对三个样品进行了表征：Nd3+<sup>掺杂Q-98、Nd3+</sup>掺杂Q-100和Yb<sup>3+</sup>掺杂Qx。我们报告了多波长热释光测量，以更准确地确定荧光量子效率和光程长度变化的温度系数(dS/dt)。在掺钕玻璃中，它使用四个离散的激发波长(在514到872 nm之间)来进行，以与离子吸收线相匹配。在掺Yb玻璃中，获得了沿Yb~(3+)跃迁(2~5/2~2)跃迁产生的热谱。此外，还得到了热扩散率、导热系数、热负荷等参数。介绍了利用热释光技术获得荧光量子效率的优点，主要是在Yb<sup>3+</sup>掺杂材料中，由于辐射俘获效应，这些材料通常被高估了。这些参数的准确了解对于高功率固体激光器的设计是非常重要的，因为这些特性直接关系到热的产生。
In this work, we study the thermal and optical properties of ion-doped phosphates glasses using the thermal lens (TL) technique. Three samples were characterized: Nd<sup>3+</sup>-doped Q-98; Nd<sup>3+</sup>-doped Q-100; and Yb<sup>3+</sup>-doped QX. We report multiwavelength TL measurements for a more accuracy determination of the fluorescence quantum efficiency and temperature coefficient of the optical path length change (<i>ds</i>/<i>dT</i>). In Nd-doped glasses, it was carried out using four discrete excitation wavelengths (between 514 and 872 nm) chosen to match with the ion absorption lines. In Yb-doped glass, the spectrum of heat generated along the Yb<sup>3+</sup> transition (<sup>2</sup> <i>F</i> <sub>5/2</sub>rarr<sup>2</sup> <i>F</i> <sub>7/2</sub>) was obtained. In addition, parameters as thermal diffusivity and conductivity, thermal loading, etc were achieved. The advantages to obtain fluorescence quantum efficiency using the TL technique, mainly in Yb<sup>3+</sup> doped materials, which are normally overestimated due to radiation trapping effect, are presented. The accuracy knowledge of these parameters is very important for design of high-power solid-state lasers, since these properties are directly related to the heat generation.