论文部分内容阅读
开发了一种用于253.7nm深紫外激光器的低功耗频率调谐和锁频系统,这种锁频系统将在中性汞原子磁光阱中起到重要作用。该系统用两个级联的声光调制器分别做频率调谐和频率调制。利用该系统可将深紫外激光器的频率锁定在汞原子的1S0-3P1的能级跃迁上,并为汞原子的激光冷却节约了功率。同时通过解调频率调制激光的饱和吸收光谱观测了汞原子的调频光谱。采用该技术将紫外激光锁定在200 Hg的1S0-3P1共振跃迁上,并且频率不稳定度低于0.1MHz。
A low-power frequency tuning and frequency-locking system for 253.7nm deep-UV lasers has been developed that will play an important role in neutral Hg magneto-optical traps. The system uses two cascaded acousto-optic modulators to do frequency tuning and frequency modulation, respectively. The system can be used to lock the frequency of deep UV laser to the energy level transition of 1S0-3P1 of mercury atom and save the power of laser cooling of mercury atom. At the same time, the FM spectrum of mercury atom was observed by demodulating the saturation absorption spectrum of frequency-modulated laser. Using this technique, the UV laser is locked to the 200 Hg 1S0-3P1 resonance transition and the frequency instability is below 0.1 MHz.