Measurement of the probe Stark shift of the 87Sr optical lattice clock using the frequency modulation spectroscopy

TL;DR

This paper introduces a frequency modulation spectroscopy method to precisely measure the probe Stark shift in the 87Sr optical lattice clock, achieving high accuracy without compromising measurement stability.

Contribution

The study presents a novel frequency modulation technique for measuring the probe Stark shift with enhanced measurement range and accuracy in optical lattice clocks.

Findings

Probe Stark shift coefficient determined as -45.97 ± 3.51 Hz/(W/cm2).

Method verified both theoretically and experimentally.

Improves precision in Stark shift evaluation for optical clocks.

Abstract

With the uncertainty of the optical clocks improving to the order of 10-18, the probe light used to detect the clock transition has demonstrated nonnegligible Stark shift, provoking to precisely evaluate this shift. Here, we demonstrate a frequency modulation technique to realize a large measurement lever arm of the probe Stark shift with no cost of the measurement accuracy of the interleaved stabilization method. This frequency-modulated spectrum is theoretical described and experimental verified. The probe Stark shift coefficient of the 87Sr optical lattice clock is experimentally determined as -(45.97+/-3.51) Hz/(W/cm2) using this frequency modulation spectroscopy.