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arXiv · 2608.09037

Population-inversion map of the mesospheric sodium ladder: continuous-wave and pulsed pumping schemes for directed emission

Yucheng Yang·Chunyang Lei·Kai Guo·Chi Peng·Zongpeng Pan
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Abstract

Directed mirrorless lasing from the mesospheric sodium layer has been proposed as a way to overcome the isotropy of laser guide star fluorescence, with demonstrated cell-scale analogues and a demonstrated stand-off magnetometry application. Several transition paths on the Na ladder compete for the same pump photons. We build a ten-level rate-equation model of the ladder from NIST transition probabilities and evaluate every electric-dipole line under four continuous-wave pumping schemes, both in a Doppler-averaged treatment and in a velocity-selective treatment appropriate for the collision-poor mesosphere. Three design-relevant results emerge. At practically accessible continuous-wave irradiances the column-gain exponents remain far below unity, consistent with published feasibility estimates; the value of the classification is to identify which lines, schemes, and pulse formats merit further study.

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Yucheng Yang, Chunyang Lei, Kai Guo, Chi Peng, Zongpeng Pan. 2026-08-10. Population-inversion map of the mesospheric sodium ladder: continuous-wave and pulsed pumping schemes for directed emission. https://arxiv.org/abs/2608.09037

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