Laser - Wikipedia
A laser is a device that emits light through a process of optical amplification based on the stimulated emission of electromagnetic radiation. The word laser is an anacronym that originated as an acronym for light amplification by stimulated emission of radiation.
How do lasers work? | Who invented the laser? - Explain that Stuff
6 天之前 · Lasers are amazing light beams powerful enough to zoom miles into the sky or cut through lumps of metal. Although they seem pretty recent inventions, they've actually been with us over half a century: the theory was figured out in …
NIF's Guide to How Lasers Work
A laser is created when electrons in the atoms in optical materials like glass, crystal, or gas absorb the energy from an electrical current or a light. That extra energy “excites” the electrons enough to move from a lower-energy orbit to a higher-energy orbit around the atom’s nucleus.
How Lasers Work - HowStuffWorks
2023年7月31日 · A laser is a device that controls the way that energized atoms release photons. "Laser" is an acronym for light amplification by stimulated emission of radiation, which describes very succinctly how a laser works. Although there are many types of lasers, all have certain essential features.
What Are Lasers And How Do They Actually Work? - ScienceAlert
Lasers are devices that concentrate beams of light by forcing their waveforms and frequencies to align. First developed in the 1960s to amplify microwaves, modern lasers technology can ramp up light rays in just about any part of the electromagnetic spectrum, with …
Lasers: Understanding the Basics - Photonics
Although lasers range from quantum-dot to football-field size and utilize materials from free electrons to solids, the underlying operating principles are always the same. This article provides the basic information about how and why lasers work.
What Is a Laser? | NASA Space Place – NASA Science for Kids
2024年11月8日 · A laser is an unusual light source. It is quite different from a light bulb or a flash light. Lasers produce a very narrow beam of light. This type of light is useful for lots of technologies and instruments—even some that you might use at home! How does a laser work?
Laser | Definition, Acronym, Principle, Applications, & Types
2024年10月22日 · Laser, a device that stimulates atoms or molecules to emit light at particular wavelengths and amplifies that light, typically producing a very narrow beam of radiation. The emission generally covers an extremely limited range …
How do lasers work? - Live Science
2024年3月29日 · Lasers work by making energetic particles vibrate, or "oscillate," in sync, meaning the peaks and troughs of light waves they emit all line up.
Laser - Light, Amplification, Coherence | Britannica
2024年10月22日 · Laser emission is shaped by the rules of quantum mechanics, which limit atoms and molecules to having discrete amounts of stored energy that depend on the nature of the atom or molecule. The lowest energy level for an individual atom occurs when its electron s are all in the nearest possible orbits to its nucleus (see electronic configuration).