From atomic physics, to upper-atmospheric chemistry, to cosmology: A “laser photometric ratio star” to calibrate telescopes at major observatories

Abstract

This Research Highlight showcases the two Research Papers entitled, A precise photometric ratio via laser excitation of the sodium layer – I. One-photon excitation using 342.78 nm light, https://doi.org/10.1093/mnras/stab1621 and A precise photometric ratio via laser excitation of the sodium layer – II. Two-photon excitation using lasers detuned from 589.16 nm and 819.71 nm resonances, https://doi.org/10.1093/mnras/stab1619.