Question

What are basic processes involved in the working of a LASER?

Answer 1

LASER is an acronym for Light Amplification by Stimulated Emission of Radiation. The working of LASER is as follows:

• A laser is created when the electrons in atoms in special glasses, crystals, or gases absorb energy from an electrical current or another laser and become excited.
• These excited electrons move from a lower-energy orbit to a higher-energy orbit around the atom’s nucleus. When they return to their normal or “ground” state, the electrons emit photons (particles of light).
• These photons are all at the same wavelength and are coherent. In contrast with ordinary visible light which comprises of multiple wavelengths and is not coherent.