通过入射的半导体激光束与在铷汽泡中产生的受激Ｒａｍａｎ散射光束之间的拍频，从高速光检测器中将输出一频率为铷原子基态超精细跃迁频率的信号．由于上述过程与暗线共振、电磁诱导透明及原子体系中的相千诱导Ｒａｍａｎ增益等密切相关，故此拍频信号具有相当窄的线宽和高的 A high-speed photodetector will output a signal at a frequency of the hyperfine transition of the rubidium atomic ground state by the beat frequency between the incident semiconductor laser beam and the excited Raman scattered beam generated in the rubidium bubble. Since the above process is closely related to the dark line resonance, the electromagnetic induction of transparency and the Raman gain in the atomic system, the beat frequency signal has a rather narrow line width and a high