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Sub-wavelength interference with thermal light

Light passes through a pair of slits, producing an interference pattern.

Coherent light passes through a pair of slits (top center). The two resulting concentric trains of waves will interfere, resulting in a fixed pattern when measured by a detector (top right). Non-coherent thermal light passes through slits and meets with a beam splitter (green plane), which reflects half the waves toward one detector and the other half toward a second detector (lower left). Each of the detectors records a temporary interference pattern (lower right).

October 2014 • JQI • https://jqi.umd.edu/news/getting-sharp-images-dull-detectors • Tagged: Illustration, Diagrams