Observation of photon recoil effects in single-beam absorption spectroscopy with an ultracold strontium gas

Abstract

We report on observing photon recoil effects in the absorption of a single monochromatic light at 689~nm through an ultracold ${}^{88}$Sr gas, where the recoil frequency is comparable to natural linewidth of the narrow-line transition $5{\mathrm{s}}^2{}^1{\text{S}}_0-5\mathrm{s}5\mathrm{p}{}^3{\text{P}}_1$ in strontium. In the regime of high-saturation, the absorption profile becomes asymmetric due to the photon-recoil shift, which is of the same order as the natural linewidth. The lineshape is described by an extension of the optical Bloch equations including the momentum transfers to atoms during emission and absorption of photons. Our work reveals the photon recoil effects in a simplest single-beam absorption setting, which is of significant relevance to other applications such as saturation spectroscopy, Ramsey interferometry, and absorption imaging.

accepted version

References in corpus (8)

• Atom interferometry with the Sr optical clock transition
• Large Momentum Transfer Clock Atom Interferometry on the 689 nm Intercombination Line of Strontium
• Cooperativity in light scattering by cold atoms
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Cited by in corpus (1)

• Rydberg electromagnetically induced transparency and absorption of strontium triplet states in a weak microwave field