论文部分内容阅读
锶原子光钟里两束repumping光的频率对应锶原子三重态系跃迁(5s5p)3 P0-(5s6s)3S1和(5s5p)3 P2-(5s6s)3S1,由于其跃迁基态处于亚稳态,所以较难利用原子的跃迁线作为参考对这两台激光器进行锁频。本文介绍一种基于腔传递的数字伺服系统实现这两台半导体激光器任意频率的同时锁定。通过一台F-P腔将He-Ne激光器的频率高稳定性同时传递到两台受控激光器上。LabVIEW程序自动搜索激光透射峰信号从而得到误差信号,由比例积分算法得出控制电压,并反馈回激光器。可视化界面易于操作和观察,可直接完成对激光器的锁定,并自动记录实验结果。该方法使用方便,锁定后激光器频率波动为±4MHz左右。该系统易扩展,可实现多台激光器的同时锁定。将锁定后的repumping光加入蓝MOT后,磁光阱内俘获的原子荧光强度增大了12倍,寿命提高了13倍,对于锶原子光钟一级冷却的研制有重要的应用价值。
Strontium Atomic Clock Two-beam repumping light corresponds to the strontium triplet state transition (5s5p) 3 P0- (5s6s) 3S1 and (5s5p) 3 P2- (5s6s) 3S1, due to its metastable ground state in a metastable state, so It is difficult to use the transition line of atoms as a reference to lock the two lasers. This article describes a cavity-based digital servo system to achieve the simultaneous locking of these two semiconductor lasers at any frequency. The high frequency stability of He-Ne lasers is simultaneously transmitted to two controlled lasers via an F-P cavity. The LabVIEW program automatically searches for the laser transmission peak signal to get the error signal, derives the control voltage from the proportional-integral algorithm and feeds it back to the laser. Visual interface easy to operate and observe, the laser can be directly locked, and automatically record the experimental results. The method is easy to use, after locking the laser frequency fluctuations of ± 4MHz or so. The system is easily scalable and enables simultaneous locking of multiple lasers. After the locked repumping light is added to the blue MOT, the atomic fluorescence intensity trapped in the magneto-optical trap is increased by 12 times and the life span is increased by 13 times, which has important application value for the development of strontium atomic light clock primary cooling.