Implementing an electronic sideband offset lock for precision spectroscopy in radium

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 \(^{226}\)Ra, and \(^{225}\)Ra....

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Bibliographic Details
Published in:arXiv.org 2023-09
Main Authors: Rabga, Tenzin, Bailey, Kevin G, Bishof, Michael, Booth, Donald W, Dietrich, Matthew R, Greene, John P, Mueller, Peter, O'Connor, Thomas P, Singh, Jaideep T
Format: Article
Language:English
Subjects:
Frequency stabilization
Isotopes
Lasers
Optical traps
Quadratures
Radium
Sidebands
Spectroscopy
Spectrum analysis
Titanium-Sapphire
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Summary: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 \(^{226}\)Ra, and \(^{225}\)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 \(2630.0\pm0.3\) MHz, a factor of 29 more precise than the previously available data. Using the known value of the hyperfine splitting of the \(^{3}P_{1}\) level, we calculate the isotope shift for the \(^{1}S_{0}\) to \(^{3}P_{1}\) transition to be \(2267.0\pm2.2\) 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.
ISSN:2331-8422
DOI:10.48550/arxiv.2307.07646