摘要
采用中心波长固定的可调谐外腔半导体激光器作为光源,通过激光吸收光谱法对锂原子同位素比率进行测量。该方法利用PID温控器实现锂金属蒸发温度的控制和测量。采用激光斜入射的方式消除光路调试过程中产生的标准具效应。实验测量给出了6组不同腔体温度下6 Li和7 Li在671nm附近的吸收光谱,通过对6LiD1和7LiD2吸收峰进行积分吸收计算,得到6Li/7Li同位素比率测量精度可达2.5%。
The technology of laser absorption spectroscopy was used for lithium isotope ratio measurement.A tunable external cavity diode laser,operating at a fixed center wavelength,was used as an optical source.The measurement and control of lithium metal evaporation temperature was achieved by the PID temperature controller.The using of laser oblique incidence eliminates the influence of etalon effect in the optical path.The absorption spectra of 6Li and 7Li near 671 nm were recorded at six different cavity temperatures.The 6Li/7Li isotope ratio was retrieved from the integrated absorbance of 6LiD1 and 7LiD2.Experiment results show that the best accuracy of lithium isotope ratio is 2.5%.
出处
《原子能科学技术》
EI
CAS
CSCD
北大核心
2012年第B09期35-38,共4页
Atomic Energy Science and Technology
关键词
激光同位素分离
可调谐外腔半导体激光器
激光吸收光谱
锂同位素比率
laser isotope separation
tunable external cavity diode laser
laser absorption spectroscopy
lithium isotope ratio
