Laser: Introduction, Einstein’s Coefficients, Types and Applications
Laser: Introduction, Einstein's Coefficients, Types and Applications! Introduction to Laser: Einstein in 1917 first predicted the fact that there should be two kinds of emissions, viz. spontaneous and stimulated. He suggested that both the emissions are required for getting the Planck's radiation law. The phenomenon of stimulated emission was first used by Townes in 1954 for constructing a microwave amplifier [...]