在具有偏振增强频率调制光谱的放电中实现激光对中性镱的稳定。

Laser stabilization to neutral Yb in a discharge with polarization-enhanced frequency modulation spectroscopy.

作者信息

Blūms Valdis, Scarabel Jordan, Shimizu Kenji, Ghadimi Moji, Connell Steven C, Händel Sylvi, Norton Benjamin G, Bridge Elizabeth M, Kielpinski David, Lobino Mirko, Streed Erik W

机构信息

Centre for Quantum Dynamics, Griffith University, Brisbane, Queensland 4111, Australia.

出版信息

Rev Sci Instrum. 2020 Dec 1;91(12):123002. doi: 10.1063/5.0019252.

DOI:10.1063/5.0019252

PMID:33379967

Abstract

Isotope selective optical excitation of atoms is important for experiments with neutral atoms, metrology, and work with trapped ions, including quantum information processing. Polarization-enhanced absorption spectroscopy is used to frequency stabilize a tunable external cavity laser diode system at 398.9 nm for isotope selective photoionization of neutral Yb atoms. This spectroscopy technique is used to measure isotope resolved dispersive features from transitions within a see-through configuration ytterbium hollow-cathode discharge lamp. This Doppler-free dichroic polarization spectroscopy is realized by retro-reflecting a laser beam through the discharge and analyzing the polarization dependent absorption with balanced detection. The spectroscopy signal is recovered using lock-in detection of frequency modulation induced by current modulation of the external cavity laser diode. Here, we show an order of magnitude improvement in the long-term stability using polarization-enhanced absorption spectroscopy of Yb compared to polarization spectroscopy.

摘要

原子的同位素选择性光激发对于中性原子实验、计量学以及与捕获离子相关的工作（包括量子信息处理）而言至关重要。偏振增强吸收光谱法用于将可调谐外腔激光二极管系统在398.9纳米处进行频率稳定，以实现中性镱原子的同位素选择性光电离。这种光谱技术用于测量来自透视图样镱空心阴极放电灯内跃迁的同位素分辨色散特征。这种无多普勒二向色性偏振光谱通过使激光束经放电后向后反射，并利用平衡检测分析偏振相关吸收来实现。通过对由外腔激光二极管的电流调制引起的频率调制进行锁相检测来恢复光谱信号。在此，我们表明，与偏振光谱相比，使用镱的偏振增强吸收光谱时长期稳定性提高了一个数量级。