2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/92914We report the realisation and preliminary study of a frequency standard using a fountain of laser cooled caesium atoms. Our apparatus uses a magneto-optical trap as a source of cold atoms and optical pumping to prepare the atoms in the correct state before they enter the microwave cavity.Keywords: Atomic clock, atomic fountain, laser coolingQuantum Physicstext