What does the acronym LASER stand for?

The acronym LASER stands for "Light Amplification by Stimulated Emission of Radiation." This definition reflects the fundamental principles behind the operation of a laser. In this context, "light amplification" refers to the process of increasing the intensity of light, which is achieved through a mechanism called stimulated emission. This process occurs when an electron transitions from a higher energy state to a lower one, emitting a photon—essentially amplifying the light.

The term "stimulated emission" is crucial, as it distinguishes lasers from other light sources that do not use this mechanism. In a laser, excited atoms or molecules emit photons in a coherent manner, resulting in a narrow beam of light. The inclusion of "radiation" indicates that the emitted light encompasses a range of wavelengths, including the visible spectrum and beyond.

This definition accurately captures the scientific principles that underpin laser technology, making it an essential concept in fields such as optics, physics, and various applications ranging from medical treatments to communication technologies. Understanding this acronym and its meaning is foundational for anyone studying lasers and their applications.