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laser British & World English

A device that generates an intense beam of coherent monochromatic light (or other electromagnetic radiation) by stimulated emission of photons from excited atoms or molecules. Lasers are used in drilling and cutting, alignment and guidance, and in surgery; the optical properties are exploited in holography, reading barcodes, and in recording and playing compact discs

dye laser British & World English

A tunable laser using the fluorescence of an organic dye

laser gun British & World English

A handheld device incorporating a laser beam, used for reading a barcode or for determining the distance or speed of an object

laser pointer British & World English

A pen-shaped pointing device that contains a small diode laser that emits an intense beam of light, used to direct attention during presentations

laser printer British & World English

A printer linked to a computer producing good-quality printed material by using a laser to form a pattern of electrostatically charged dots on a light-sensitive drum, which attract toner (or dry ink powder). The toner is transferred to a piece of paper and fixed by a heating process

laser therapy British & World English

The use of lasers in surgery and other medical or cosmetic treatment

laser treatment British & World English

The use of lasers in cosmetic or medical care

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