An alkali metal vapor enclosure comprising: an internal surface comprising nanostructures; a transmissive portion to enable the internal surface to be illuminated; wherein the enclosure contains atoms of an alkali metal which are in a vapor state and/or adsorbed onto the internal surface; and wherein illumination of the internal surface via the transmissive portion with light having a frequency to cause a temperature rise in the nanostructures by exciting an enhanced optical extinction mechanism in the nanostructures, causes an increase in the density of the alkali metal vapor.

Original languageEnglish
Patent numberWO2020099853
Priority date13/11/18
Publication statusPublished - 22 May 2020


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