PHOTON MASS

摘要

The Helium Neon Laser operation is dependent on Light Amplification by Stimulated Emission of Radiation. The metastable helium atoms in the 3P2 state collide with the Neon atoms and transfer the energy to the 3S state of Neon. When the excited neon atom in 3S releases a photon it drops to the 2P energy state. The quantum of energy is emitted as a photon. Professor Willis E Lamb wrote a paper "Theory of the Optical Maser". My research on gaseous lasers "Time Development of a Laser Signal" demonstrated how this transfer of energy from helium metastable atom produces an excited state in the neon atom.