What does the acronym LASER stand for?

The acronym LASER stands for "Light Amplification by Stimulated Emission of Radiation." This definition highlights the fundamental process by which lasers operate. In essence, a laser generates a focused beam of light through the amplification of photons, which occurs via stimulated emission. When an electron in an excited state returns to a lower energy state, it emits a photon, and this process can be stimulated by incoming photons, leading to a cascading effect that amplifies the light.

Understanding this definition is crucial not only for grasping the physics behind laser technology but also for applying it in practical fields such as medical therapy, where lasers are employed for a variety of treatments due to their precision and efficiency. The other options do not accurately reflect the principles of laser technology or the term itself.