coherent light
(redirected from Coherence (physics))Also found in: Encyclopedia, Wikipedia.
co`her´ent light
n. 1. (Physics, Optics) Light in which the phases of all electromagnetic waves at each point on a line normal to the direction of the the beam are identical. Coherent light is usually monochromatic, and the most common source of such light for practical uses is from a laser.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.