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Accurate determination of the excited-state elastic-collision dephasing coefficient in 88Sr

Determine the accurate value of the dephasing coefficient for elastic collisions between 88Sr atoms in the 3P0 excited state, which the simulations currently approximate as 3.2×10^-10 cm^3/s (equal to the ground-state dephasing coefficient) due to a lack of experimental data, in order to quantitatively model continuous superradiant lasing in the optical conveyor configuration.

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Background

In extending the decoherence model to include elastic-collision-induced dephasing for atoms in the 3P0 excited state of 88Sr, the authors lack direct experimental measurements of the corresponding dephasing coefficient. They therefore set this coefficient equal to the known ground-state value used in prior work (Lisdat et al., 2009).

The precise value of this coefficient directly impacts the feasibility and operating point of the superradiant laser, including required magnetic field strengths, stability of steady-state solutions, and the predicted output power and linewidth. An accurate experimental determination would enable more reliable optimization and performance forecasts.

References

Due to the lack of experimental data, we set the dephasing coefficient for the excited state γ_dep=3.2×10-10 cm3/s equal to the dephasing coefficient in the ground state. Its accurate determination is left as the subject of future experimental study.

— Modeling of a continuous superradiant laser on the sub-mHz $^1$S$_0\,\rightarrow\,^3$P$_0$ transition in neutral strontium-88 (2409.06575 - Dubey et al., 10 Sep 2024) in Section 6.2 (Simulation with extended dephasing model)