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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. 𓏬𓏬𓏬𓏬𓏬ELEVATE CLASSES𓏬𓏬𓏬𓏬𓏬 Browse LIVE & Recorded Courses for Physics IITJAM, CSIR-NET, GATE, TIFR, JEST etc on our platform ► https://www.elevateclasses.in/ Android ► https://bit.ly/3zU71ur iOS ► https://apple.co/3ZPRWVJ (use ORG code - AHGXS) 𓏬𓏬𓏬𓏬𓏬LEC NOTES - GDRIVE𓏬𓏬𓏬𓏬𓏬 Find the PDF Scanned copy of my NOTES for this lecture here: https://drive.google.com/file/d/1deBwqhJTvPz1gpc0TwRsfBp0ZMwkWEEf/view?usp=drive_link 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 𓏬𓏬𓏬𓏬𓏬𓏬TELEGRAM𓏬𓏬𓏬𓏬𓏬𓏬 Join my Telegram Channel ► https://t.me/FortheLoveofPhysicsYT 𓏬𓏬𓏬𓏬𓏬SUPPORT CHANNEL𓏬𓏬𓏬𓏬𓏬 Your Financial support provides me an additional incentive to create high quality lecture videos. I am very much thankful for your generosity and kindness Support/ Patreon ❤️❤️❤️https://www.patreon.com/dibyajyotidas Donate/ Paypal 🔥🔥🔥 https://paypal.me/FortheLoveofPhysics JOIN MEMBERSHIP in Youtube 😇😇😇 https://www.youtube.com/channel/UCOfLm6gZGt3vwTMKRg-irhg/join
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