Energy transfer upconversion measurements for popular neodymium-doped crystals
Energy transfer upconversion measurements for popular neodymium-doped crystals
复制标题
流行的掺钕晶体的能量转移上转换测量
DOI：
10.1117/12.2082707
复制
发表时间：
2015
影响因子：
4.9
通讯作者：
J. Mackenzie
中科院分区：
文献类型：
--
作者：
S. Yoon;R. Yan;S. Beecher;J. Mackenzie
报道了利用Z扫描技术测量不同掺钕激光晶体（YAG、YVO_4、GdVO_4、KGW和YLF）中能量转移上转换（ETU）参数的研究。从一个简单的两级宏观参数空间相关速率方程模型开始，我们得到了很好的相关性Nd：YAG在不同的浓度和晶体温度，但其他晶体的模拟和测量之间的显着偏差。目前，我们将这种差异归因于各自样品中的额外离子-离子相互作用，目前正在考虑更详细的模型。在所测试的材料中，Nd：YAG似乎具有最低的ETU宏观参数，对于0.6 at.%掺杂浓度，与0.5原子% Nd：YLF的标称三倍相比，0.5原子% Nd：YLF的掺杂浓度几乎高一个数量级。钒酸盐（YVO 4和GdVO 4）。这些值对于确定相应增益介质中的附加热负载是重要的，特别是当试图增加来自采用这些晶体的激光器的输出功率/能量时，通常通过增加泵浦和腔模尺寸来实现。
We report our investigations on measuring the energy transfer upconversion (ETU) parameter in various neodymiumdoped laser crystals (YAG, YVO4, GdVO4, KGW, and YLF) via the z-scan technique. Starting with a simple two-level macro-parameter spatially dependent rate equation model we obtain a good correlation for Nd:YAG at different concentrations and crystal temperatures, however the other crystals illustrate significant deviation between simulation and measurement. Currently we attribute this difference to additional ion-ion interactions in the respective samples, for which a more detailed model is currently being considered. Of the tested materials Nd:YAG appears to have the lowest ETU macro parameter, at around 0.35 x10-16 cm3/s for a 0.6 at.% doping concentration, compared with nominally thrice this for 0.5 at% Nd:YLF and almost an order of magnitude higher for the 0.5 at.% vanadates (YVO4 and GdVO4). These values are significant for determining additional heat load in the respective gain media, especially when trying to increase the output power/energy from lasers employing these crystals, typically achieved by increasing the pump and cavity mode size.