A device which produces an intense, usually narrow, monochromatic beam of coherent light; called also optical maser. It has various forms, and is used in various applications in science and technology. The beam is produced by boosting the majority of the electrons in specific radiation-absorbing atoms in a medium into a higher energy level, from which they are stimulated by their own emitted radiation to drop back synchronously to their lower energy level, and emit light which is in phase (coherent).
Light Amplification by Stimulated Emission of Radiation. Lasers are the source of light used to excite fluorochromes in flow cytometry.
An acronym for Light Amplification by Stimulated Emission of Radiation. The light waves in a laser move in exactly the same way as each other and are all the same frequency. This results in a powerful beam of light that can produce intense heat when focused at close range. Lasers are used in many fields. In medicine, lasers are used in microsurgery, cauterization, and for diagnostic purposes. Lasers are used in telecommunications to transmit data.