"Complete LASER Notes for RGPV Students – 2025 Exam Special"
🔷 What is LASER? LASER is a special type of light. It is very strong, straight, and focused. You can see lasers in barcode scanners, CDs, surgeries, and internet systems. 🔷 Full Form of LASER LASER = Light Amplification by Stimulated Emission of Radiation It means: making light stronger using a special process called stimulated emission. 🔷 How does LASER work? (Simple Steps) Laser works using three main steps: 1. Population Inversion Normally, atoms stay in a low energy state. But to make a laser, we need more atoms in a high energy state. This is called population inversion. 2. Stimulated Emission When one photon (light particle) hits an excited atom, the atom gives off another photon. Both photons are exactly the same — same direction, energy, and phase. 3. Mirrors (Optical Cavity) The laser machine has two mirrors. Light bounces between them again and again. This makes the light stronger. One mirror lets a small part of light go out. This is the laser beam. --- 🔷 Main Features o...