What does LASER stand for?

LASER stands for "Light amplification by stimulated emission of radiation." This term captures the fundamental principle behind how lasers operate. In the process of laser generation, light is amplified through a method known as stimulated emission, where photons stimulate excited atoms or molecules to release additional photons of the same wavelength and phase. This results in a coherent beam of light that is highly focused and powerful.

The other options do not accurately reflect the scientific principles involved in the operation of a laser. For example, "Liquid absorption by stimulated emission of radiation" and "Light absorption by selective emission of radiation" introduce incorrect concepts such as absorption rather than amplification. Additionally, "Laser activation by synchronized emission of radiation" misrepresents the core mechanism, which is based on amplification, not merely activation or synchronization. Understanding this definition helps in grasping the basic principles of how lasers function and their applications in various fields, including electrology.