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A laser is a device that emits light through a process of optical amplification based on the stimulated emission of electromagnetic radiation.

The term "laser" originated as an acronym for "light amplification by stimulated emission of radiation".

The first laser was built in 1960 by Theodore H.

Maiman at Hughes Research Laboratories, based on theoretical work by Charles Hard Townes and Arthur Leonard Schawlow.

A laser differs from other sources of light in that it emits light coherently.

Spatial coherence allows a laser to be focused to a tight spot, enabling applications such as laser cutting and lithography.

Spatial coherence also allows a laser beam to stay narrow over great distances (collimation), enabling applications such as laser pointers.

Lasers can also have high temporal coherence, which allows them to emit light with a very narrow spectrum, i.e., they can emit a single color of light.

Temporal coherence can be used to produce pulses of light as short as a femtosecond.

Inkjet printing is a type of computer printing that recreates a digital image by propelling droplets of ink onto paper, plastic, or other substrates.

Inkjet printers are the most commonly used type of printer, and range from small inexpensive consumer models to expensive professional machines.

The ampere (SI unit symbol: A, dimension symbol: I), often shortened to "amp", is a unit of electric current.

In the International System of Units (SI) the ampere is one of the seven SI base units.

It is named after André-Marie Ampère (1775–1836), French mathematician and physicist, considered the father of electrodynamics.