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Shelving spectroscopy of the strontium intercombination line

Abstract : We present a spectroscopy scheme for the 7-kHz-wide 689-nm intercombination line of strontium. We rely on shelving detection, where electrons are first excited to a metastable state by the spec-troscopy laser before their state is probed using the broad transition at 461 nm. As in the similar setting of calcium beam clocks, this enhances dramatically the signal strength as compared to direct saturated fluorescence or absorption spectroscopy of the narrow line. We implement shelving spectroscopy both in directed atomic beams and hot vapor cells with isotropic atomic velocities. We measure a fractional frequency instability ∼ 2 × 10 −12 at 1 s limited by technical noise-about one order of magnitude above shot noise limitations for our experimental parameters. Our work illustrates the robustness and flexibility of a scheme that can be very easily implemented in the reference cells or ovens of most existing strontium experiments, and may find applications for low-complexity clocks.
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Submitted on : Monday, April 27, 2020 - 11:14:26 AM
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I Manai, A Molineri, C Fréjaville, C Duval, P Bataille, et al.. Shelving spectroscopy of the strontium intercombination line. Journal of Physics B: Atomic, Molecular and Optical Physics, IOP Publishing, 2020, 53 (8), pp.085005. ⟨10.1088/1361-6455/ab707f⟩. ⟨hal-02333792v2⟩

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