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Interference between two laser beams

Interference between two laser beams


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Interference between two laser beams, as could be observed using Michelson interferometer with a green laser. Single laser beam is split into two beams which are then recombined and crossed at a small angle to each other. The individual beams are offset somewhat laterally. The interference fringes are observed in a plane perpendicular to the beams' propagation direction. The fringe contrast is maximized at the centre, where individual beams' intensities are about equal. The fringe contrast reduces when moving from the centre to either side horizontally as the intensities of the beams become noticeably different. Conceptually, this is a modern-day replication of Thomas Young's double-slit experiment. Digital composite.

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