Intensity interferometry is a promising technique that enables the precise measurement of spatial properties (i.e., distances, shapes and light properties) by probing fluctuations in the intensity (i.e., brightness) of light, as opposed to the exact timing and phase of light waves probed by amplitude (phase) interferometry. Intensity interferometry could overcome some of the limitations of amplitude interferometry, as it is less sensitive to atmospheric factors and optical imperfections.
An active optical intensity interferometry scheme enables synthetic aperture imaging from over a kilometer away
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