Interference fringes. Interference between two laser beams, as could be observed using Michelson interferometer with a blue laser. Single laser beam is split into two beams which are then recombined and crossed at a small angle to each other. The interference fringes are observed in a plane perpendicular to the beams' propagation direction. Conceptually, this is a modern-day replication of Thomas Young's double-slit experiment. Digital composite.
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