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Laser - Wikipedia A laser differs from other sources of light in that it emits light that is coherent Spatial coherence allows a laser to be focused to a tight spot, enabling uses such as optical communication, [6] laser cutting, and lithography
Laser | Definition, Acronym, Principle, Applications, Types | Britannica 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 of visible, infrared, or ultraviolet wavelengths
激光技术基础知识 - 知乎 激光英文名 LASER，其全称是Light Amplification by Stimulated Emission of Radiation。 字面意思就是“光受激辐射放大”。 其为人工光源，具有与自然光不同的特性，可直线传播到很远，并且可聚集在较小范围等…
NIFs 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
Lasers | Stanford Emerging Technology Review A laser is a light source with three important characteristics Laser light is monochromatic, meaning the light is highly concentrated around a central wavelength, with very little emitted at other wavelengths
What Is A Laser? | NIST A laser is a device in which a collection of atoms or molecules, a semiconductor, or another quantum system, is held between mirrors and energized, or pumped, so that something in the system (the electrons, for example) reach a higher-energy "excited" state \
What Is a Laser? | NASA Space Place – NASA Science for Kids Because laser light stays focused and does not spread out much (like a flashlight would), laser beams can travel very long distances They can also concentrate a lot of energy on a very small area