We report the use of a digital lock to measure the line profile and center frequency of rubidium 5S-7S two-photon transitions with a cw laser referenced to an optical frequency comb. The narrow, two-photon transition, 5S-7S (760 nm), insensitive to first-order in a magnetic field, is a promising candidate for frequency reference.
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Morzyński, P., Wcisło, P., Ablewski, P., Gartman, R., Gawlik, W., Masłowski, P., … Zawada, M. (2014). Line shape measurements of rubidium 5S-7S two-photon transition. In Journal of Physics: Conference Series (Vol. 548). Institute of Physics Publishing. https://doi.org/10.1088/1742-6596/548/1/012023