The optimum match concentration for Yb 3+ ,Na+:CaF_2 with low laser threshold was obtained.
基于975nm激发的室温下荧光光谱测量,系统地研究了在新型钠、镱共掺的氟化钙晶体中钠离子的作用机理,分析了掺钠离子浓度与激光阈值的关系,获得了具有最低激光阈值的掺杂浓度优化配比。
The analytical formulas of laser threshold of the quasi-four-energy-level system for (Tm3+ ,Tb3+ ) :LiYF4 are deduced from rate-equation of transition.
由速率方程推出了双掺(Tm~(3+),Tb~(3+))离子准四能级系统的激光阈值解析式,讨论了Tm~(3+)和Tb~(3+)离子之间的相互作用。
Through defining the brittleness waken degree and waken threshold value, Whether the brittleness of system can be waken is andlyzed.
由模糊层次分析法得到了因素(或元件)的相对重要度排序矢量,通过定义脆性激发度及激发阈值,对系统的脆性是否被激发进行了理论的分析。
The stimulus threshold,maximal stimulus,peak value of compound action potential and refractory period were measured on the toad sciatic nerves after 30 seconds while adding ethanol or acetaldehyde of different concentration with Ringer solution.
将含有不同浓度的乙醇、乙醛的任氏液滴加到蟾蜍坐骨神经表面,30 s后测定神经干刺激阈值、最大刺激值、复合动作电位峰值和不应期等电生理指标。