论文标题
调制转移光谱的优化策略应用于激光稳定
Optimization strategies for modulation transfer spectroscopy applied to laser stabilization
论文作者
论文摘要
我们提出了用于确定调制转移光谱方案的最佳调制参数的一般分析。结果是普遍有效的，可以应用于任何原子物种的光谱，仅需要有效的线宽$γ_{eff} $的知识。预测具有优化坡度和振幅的信号将用于大型调制指数$ m $，并且调制频率可与光谱过渡的自然线宽相当。由于实践方面的考虑，调制指数在$ 3 \ le m \ le 10 $之间已被确定为最佳。该参数制度可通过基于声音调制器的设置在实验上访问。提出了用于rubidium d2线光谱的优化信号。信号形状和对调制参数的依赖性与给出的理论描述非常吻合。提出了一种实现对残余幅度调制的强抑制的实验程序。基于优化的信号，我们证明了长期激光稳定，导致激光线宽为150 \，kHz（16 \ s的平均值），频率稳定性在15小时内为18 \，kHz（rms）。
We present a general analysis for determining the optimal modulation parameters for the modulation transfer spectroscopy scheme. The results are universally valid and can be applied to spectroscopy of any atomic species requiring only the knowledge of the effective linewidth $Γ_{eff}$. A signal with optimized slope and amplitude is predicted for a large modulation index $M$ and a modulation frequency comparable to the natural linewidth of the spectroscopic transition. As a result of competing practical considerations, a modulation index in the range of $3 \le M \le 10$ has been identified as optimal. This parameter regime is experimentally accessible with a setup based on an acousto-optic modulator. An optimized signal for spectroscopy of the rubidium D2 line is presented. The signal shape and the dependence on the modulation parameters are in very good agreement with the theoretical description given. An experimental procedure for achieving a strong suppression of residual amplitude modulation is presented. Based on the optimized signal, we demonstrate long-term laser stabilization resulting in a laser linewidth of 150\,kHz (16\,s average) and a frequency stability of 18\,kHz (rms) over 15 hours.
