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This article is the second in a pair of articles on the topic of thegeneration of a two-color artificial star (which we term a "laser photometricratio star," or LPRS) of de-excitation light from neutral sodium atoms in themesosphere, for use in precision telescopic measurements in astronomy andatmospheric physics, and more specifically for the calibration of measurementsof dark energy using type Ia supernovae. The two techniques respectivelydescribed in both this and the previous article would each generate an LPRSwith a precisely 1:1 ratio of yellow (589/590 nm) photons to near-infrared(819/820 nm) photons produced in the mesosphere. Both techniques would providenovel mechanisms for establishing a spectrophotometric calibration ratio ofunprecedented precision, from above most of Earth's atmosphere, for upcomingtelescopic observations across astronomy and atmospheric physics.  The technique described in this article has the advantage of producing a muchbrighter (specifically, brighter by approximately a factor of 1000) LPRS, usinglower-power (<30 W average power) lasers, than the technique using a single 500W average power laser described in the first article of this pair. However, thetechnique described here would require polarization filters to be installedinto the telescope camera in order to sufficiently remove laser atmosphericRayleigh backscatter from telescope images, whereas the technique described inthe first article would only require more typical wavelength filters in orderto sufficiently remove laser Rayleigh backscatter.

monthly notices of the royal astronomical society

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