Implementing an electronic sideband offset lock for precision spectroscopy in radium
Abstract
We demonstrate laser frequency stabilization with at least 6 GHz of offset tunability using an in-phase/quadrature (IQ) modulator to generate electronic sidebands (ESB) on a titanium sapphire laser at 714 nm and we apply this technique to the precision spectroscopy of Ra, and Ra. By locking the laser to a single resonance of a high finesse optical cavity and adjusting the lock offset, we determine the frequency difference between the magneto-optical trap (MOT) transitions in the two isotopes to be MHz, a factor of 29 more precise than the previously available data. Using the known value of the hyperfine splitting of the level, we calculate the isotope shift for the to transition to be MHz, which is a factor of 8 more precise than the best available value. Our technique could be applied to countless other atomic systems to provide unprecedented precision in isotope shift spectroscopy and other relative frequency comparisons.
Cite
@article{arxiv.2307.07646,
title = {Implementing an electronic sideband offset lock for precision spectroscopy in radium},
author = {Tenzin Rabga and Kevin G. Bailey and Michael Bishof and Donald W. Booth and Matthew R. Dietrich and John P. Greene and Peter Mueller and Thomas P. O'Connor and Jaideep T. Singh},
journal= {arXiv preprint arXiv:2307.07646},
year = {2024}
}