The excited Helium atoms collide with ground-state Neon atoms. Because the energy levels of Helium and Neon are very close, the energy is transferred to the Neon atoms, exciting them to their own metastable states ( E4cap E sub 4 E6cap E sub 6
They have a very long coherence length, making them ideal for holography. helium-neon laser ppt free download
), they release photons. These photons bounce between the mirrors, stimulating other Neon atoms to release identical photons, resulting in a coherent, monochromatic laser beam. 4. Why Use Helium-Neon Lasers? Why choose He-Ne over cheaper diode lasers? The excited Helium atoms collide with ground-state Neon
). These levels are "metastable," meaning the atoms stay there longer than usual. making them ideal for holography. )