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.
Stimulated absorption (or) Absorption Let E1 and E2 be the energies of ground and excited states of an atom. Suppose, if a photon of energy E1 − E2 = hυ interacts with an atom present in the ground state, the atom gets excitation form ground state E1 to excited state E2. This process is called stimulated absorption
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