Laser Physics - Stimulated Emission & Einstein Coefficients | Three Level Laser
Channel: For the Love of Physics
Date: 2023-12-14

What is the Physics behind light amplification via lasers? Lasers are synonymous with technology, but is based on a simple concept of Physics called Stimulated Emission.

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𓏬𓏬𓏬𓏬𓏬VIDEO DESCRIPTION𓏬𓏬𓏬𓏬𓏬𓏬
Lasers are devices that produce highly focused and coherent beams of light through a process known as stimulated emission. In stimulated emission, an atom in an excited state emits a photon when it encounters another photon of the same frequency, resulting in amplification of light.

Three-level lasers are a type of laser system with three energy levels: ground state, excited state, and metastable state. They utilize population inversion, where more atoms occupy the metastable state than the excited state, to achieve laser action.

Einstein coefficients are mathematical terms used to describe the probability of different processes in the interaction of light with matter. They are named after Albert Einstein, who introduced them to explain the physics of stimulated emission and absorption, which are fundamental principles underlying laser operation.

00:00 Introduction
01:46 Laser Physics - Stimulated Emission
15:30 Three Level Laser
22:15 Einstein Coefficients

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