Hyper-Ramsey spectroscopy with probe laser intensity fluctuations

TL;DR

This paper investigates how fluctuations in probe laser intensity affect hyper-Ramsey spectroscopy, revealing potential vulnerabilities in its robustness and quantifying the resulting clock errors for ytterbium ion transitions.

Contribution

It introduces a model linking laser intensity fluctuations to spectroscopic errors, highlighting the impact on hyper-Ramsey method robustness and clock accuracy.

Findings

Probe laser fluctuations can compromise hyper-Ramsey robustness.

Quantified clock errors for Yb+ electric octupole transition.

Model predicts error dependence on fluctuation levels.

Abstract

We examine the influence of probe laser intensity fluctuations on hyper-Ramsey spectroscopy. We assume, as is appropriate for relevant cases of interest, that the probe laser intensity $I$ determines both the Rabi frequency $(\propto\sqrt{I})$ and the frequency shift to the atomic transition $(\propto I)$ during probe laser interactions with the atom. The spectroscopic signal depends on these two quantities that co-vary with fluctuations in the probe laser intensity. Introducing a simple model for the fluctuations, we find that the signature robustness of the hyper-Ramsey method can be compromised. Taking the Yb$^+$ electric octupole clock transition as an example, we quantify the clock error under different levels of probe laser intensity fluctuations.