UV laser pointer coupled into a cup
An blue/UV laser pointer was coupled into the handle of a cup, which guides it and feeds it into a fluorescing liquid that lights up in green colors. Surrounding Lab environment was darkened completely to highlight the effect. Mild post-processing was done (clipping, lifting the contrasts, noise correction). The image was taken in the lab at Leibniz-IPHT Jena. [Winner 2018 After Image photo contest.]
—Tobias Tieß, Leibniz-IPHT