钕的激光内腔吸收光谱的研究

本文通过钕的激光内腔吸收的测定,研究了激光器的各种参数(包括谐振腔长、泵浦能量、反射镜间的平行度、输出反射镜的透光率和脉冲重复率等)对激光内腔吸收法灵敏度的影响,并在理论上进行了初步的探讨。实验结果表明,本法灵敏、快速。钕离子的检定限可达1×10^-3M,比常用的外腔吸收光度法灵敏度提高27倍。本法可用于轻稀土混合物中钕的定量测定。

THE RESEARCH ON THE LASER INTRA-CAVITY ABSORPTION SPECTROMETRY OF NEODYMIUM

The laser intra-cavity absorption method is of a newly developed technique used for the determination of weakly absorbed substance, it has the merits of high sensitivity and simple operation. This paper has, studied the effects of various laser parameters(including resonant cavity length, pump energy, the transmittance of output mirror, pulse repetition frequency, etc.) on sensitivity. Apreliminary theoretical exploration is presented. An important reason why the formula proposed by Horlick does not coincide with the result of this experiment is due to the fact that two reflective mirrors of the resonant cavity can not be strictly parallel. The corresponding formula is deduced.Experimental results showedn that Beer's law is obeyed in the range of Neodymium ion concentration of 2 ×10^-3-1×10^-2 M, the sensitivity increases by a factor of 27, as compared with that of the conventional absorption spectrometry, some rare-earth elements like La, Ce, Pr, Sm, Yetc. do not interfere. This method can be used for the determination of Neodymium in light rare-earth mixtures.