Abstract
Abstract A general purpose collimator capable of collimation of radiation from an arbitrary thermal source of diffuse light is incompatible with the second law of thermodynamics. It is known, however, that diffusion of coherent light from a particular ground glass can be reversed holographically. A new collimator is presented which produces a partially collimated beam of increased radiance when placed close to a white (diffusely reflective) source.
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