锶原子互组跃迁荧光谱及其特性的研究

Study on Fluorescence Spectrum of Strontium Intercombination Transition and Its Characteristics

真空锁频系统是实现激光稳频的重要组成部分,在该系统中产生高分辨互组跃迁荧光谱((5s2)1S0→(5s5p)3P1)是分析原子谱线相关特性及精确测量跃迁频率等参数的前提。本文通过将装载有毛细管的准直器置于锶炉内,从源头减小原子束的发散角,将原子束的发散角减小至3.1 mrad。即减小原子束的横向速度,进而减弱光与原子作用的一阶多普勒频移,实验最终得到分辨率较高且线宽为26 MHz的互组跃迁荧光谱。锶原子互组跃迁荧光谱特性的相关研究对于光晶格原子钟锁频系统的建立具有重要意义,因此本文从实验上探讨并分析了锶炉温度和激光光强等因素对互组跃迁荧光谱的影响。

The vacuum frequency locking system is an important part for achieving laser frequency stabilization.The high resolution intercombination transition spectrum((5 s2)1S0→(5 s5 p)3P1)is to analyze the spectrum characteristics and accurately measures the transition frequency.In this paper,the divergence angle of the atomic beam is reduced to 3.1 mrad by stacking capillary into the collimator.That is,reducing the lateral velocity of atomic beam,which is beneficial to weaken the first-order Doppler shift of the interaction between laser and atoms.The experimental results show that the line width of intercombination transition spectroscopy is 26 MHz with a higher resolution.The correlation study of the intercombination transition spectroscopy is of great significance for the frequency-locked system and frequency stabilization system of optical lattice atomic clock.The effects of furnace temperature and laser intensity on the fluorescence spectrum of intercombination transition were discussed and analyzed.