laserI

Laseri is a term that may refer to lasers in certain linguistic or contextual settings. Lasers, an acronym for Light Amplification by Stimulated Emission of Radiation, are devices that emit highly coherent light through stimulated emission of photons.

How a laser works involves three essential elements: a gain medium that can amplify light, an energy source to excite the medium, and an optical resonator that provides feedback to sustain amplification. When the medium is driven into a population inversion, stimulated emission produces photons that are emitted in phase, direction, and wavelength, yielding a narrow and powerful beam.

Lasers vary by gain medium and emission wavelength. Common types include solid-state lasers (such as Nd:YAG), gas lasers (like CO2 and He-Ne), dye lasers, semiconductor (diode) lasers, and fiber lasers. They can operate in continuous-wave or pulsed modes and cover a broad spectrum from ultraviolet to infrared.

Applications are diverse. In industry, lasers are used for cutting, welding, engraving, and additive manufacturing. In medicine, they enable precise surgery and eye treatments. In communications, laser and fiber-optic systems transmit data over long distances. In science, lasers support spectroscopy, metrology, imaging, and fundamental experiments. Consumer devices incorporate lasers in barcode scanners, optical storage, and projectors.

Safety and regulation are important aspects. Lasers can cause eye or skin injuries, and many jurisdictions require protective equipment, beam controls, and adherence to safety standards and classifications.

Historically, the first working laser was built by Theodore Maiman in 1960 using a ruby crystal. Since then, advances in diode, fiber, and solid-state technologies have broadened capabilities and reduced costs. The form laseri may appear in some non-English contexts as a plural or inflected variant, but the standard English term remains laser, with lasers as the plural.