What does the acronym LASER stand for?

The acronym LASER stands for "Light Amplification by Stimulated Emission of Radiation." This terminology is fundamental in understanding how lasers operate, as it describes the process by which lasers produce their coherent light. In this process, atoms or molecules are excited to a higher energy state and then stimulated to emit light when they return to their lower energy state. This emitted light is amplified, resulting in the powerful and focused beam characteristic of lasers.

The other choices represent incorrect definitions or variations that don't align with the established scientific terminology of laser technology. Understanding the correct definition is crucial for individuals in fields where laser technology is applied, including law enforcement and speed measurement, as it underpins the functionality and purpose of devices like speed detection radar and lidar.