One mode at a time – Nature Physics- Times Of Nation
Inside a laser, light passes through an amplifying material many times to build up a lasing mode. The goal is to keep the light inside the laser medium for as long as possible to achieve maximum amplification. The easiest way to do this is to put a mirror on either side of the material, but other approaches exist. Random lasers, for example, have no mirrors at all and rely solely on multiple scattering. The lasing then stems from random paths through the material and is not associated with eigenmodes of the system, as it is for mirror-based lasers.
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