We study the possibility of suppressing light shifts in Ramsey spectroscopy of coherent population trapping (CPT) using generalised autobalanced Ramsey spectroscopy (GABRS) and combined error signal in Ramsey spectroscopy (CESRS). We consider CPT resonances excited by a coherent bichromatic field in an open Λ-system with a ‘trap’ state. Using a rigorous mathematical proof and numerical calculations, these methods are shown to lead to complete suppression of the light shift and its fluctuations. Implementation of GABRS and CESRS in CPT clocks can markedly improve accuracy and long-term stability of these devices. These methods can also be applied in atomic CPT magnetometers and interferometers.

我们研究了使用广义自平衡拉姆齐光谱 (GABRS) 和拉姆齐光谱 (CESRS) 中的组合误差信号抑制相干种群捕获 (CPT) 拉姆齐光谱中光位移的可能性。我们考虑在具有“陷阱”状态的开放 Λ 系统中由相干双色场激发的 CPT 共振。使用严格的数学证明和数值计算，这些方法被证明可以完全抑制光移及其波动。在 CPT 时钟中实施 GABRS 和 CESRS 可以显着提高这些设备的精度和长期稳定性。这些方法也可以应用于原子 CPT 磁力计和干涉仪。