Transcription of Unit –I LASER Engineering Physics - Applied Physics
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Unit –I LASER Engineering Physics - Applied Physics
Unit I LASER Engineering Physics Introduction LASER stands for light Amplification by Stimulated Emission of Radiation. The theoretical basis for the development of LASER was provided by Albert Einstein in 1917. In 1960, the first LASER device was developed by Mainmann. 1. Definitions Stimulated absorption (or) Absorption Let 1 Eand 2 Ebe the energies of ground and excited states of an atom. Suppose, if a photon of energy hEE= 21 interacts with an atom present in the ground state, the atom gets excitation form ground state1E to excited state2E.
Xenon flash tubes are used for optical pumping. Since these materials have very broad band absorption, sufficient amount of energy is absorbed from the emission band of flash lamp and population inversion is created. Examples of optically pumped lasers are ruby, Nd: YAG Laser ( Y3 Al G5 12) (Neodymium: Yttrium Aluminum Garnet), Nd: Glass Laser ...
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