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DOE OSTI · 2217382

Implementing an electronic sideband offset lock for isotope shift spectroscopy in radium

Rabga, T.·Bailey, K. G.·Bishof, M.·Booth, D. W.·Dietrich, M. R.·Greene, J. P.·Mueller, P.·O’Connor, T. P.·Singh, J. T.
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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 perform isotope shift 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 ± 0.3 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 ± 2.2 MHz, 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.

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BibTeXRIS

Rabga, T., Bailey, K. G., Bishof, M., Booth, D. W., Dietrich, M. R., Greene, J. P., Mueller, P., O’Connor, T. P., Singh, J. T.. 2023-11-21. Implementing an electronic sideband offset lock for isotope shift spectroscopy in radium. https://doi.org/10.1364/oe.500578

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