Compensation of Field-Induced Frequency Shifts in Ramsey Spectroscopy of Optical Clock Transitions

TL;DR

This paper introduces a method to compensate for field-induced frequency shifts in Ramsey spectroscopy, enhancing precision for optical clock transitions affected by Stark and Zeeman effects.

Contribution

The paper presents a novel frequency stepping technique during Ramsey pulses to mitigate excitation-induced shifts in optical clock spectroscopy.

Findings

Effective compensation of frequency shifts demonstrated

Applicable to transitions with large Stark and Zeeman shifts

Improves accuracy of optical clock measurements

Abstract

We have extended Ramsey spectroscopy by stepping the probe frequency during the two Ramsey excitation pulses to compensate frequency shifts induced by the excitation itself. This makes precision Ramsey spectroscopy applicable even for transitions that have Stark and Zeeman shifts comparable to the spectroscopic resolution. The method enables a new way to evaluate and compensate key frequency shifts, which benefits in particular, optical clocks based on magnetic field-induced, spectroscopy, two-photon transitions, or heavily forbidden transitions.