What does the acronym LASER stand for?

The acronym LASER stands for "Light Amplification by Stimulated Emission of Radiation." This definition reflects the fundamental principle behind how lasers function. In a laser, light is produced and amplified through a process called stimulated emission, where photons stimulate excited atoms or molecules to emit additional photons, all of which are coherent, meaning they have the same phase, frequency, and direction.

The term "amplification" indicates that the light generated is intensified, making lasers incredibly powerful tools for various applications, including medical procedures, telecommunications, and industrial uses. The use of "radiation" in the acronym refers to the electromagnetic radiation produced, which can cover a range of wavelengths, from infrared to ultraviolet.

Overall, this definition accurately captures the core scientific principles of laser technology, making it the correct choice.