Partial Collimation of Diffuse Light from a Diffusely Reflective Source |
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| Authors: | RS Lakes G Vick |
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| Affiliation: | 1. Department of Biomedical Engineering, the Department of Mechanical Engineering and the Center for Laser Science and Engineering , University of Iowa , Iowa City, IA, 52242, USA;2. Control, Display, and Sensor Technology, Avionics Group , Rockwell International Corporation , 400 Collins Road NE, Cedar Rapids, Iowa, 52498, USA |
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| 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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