The author is with the Department of Physics and The Enrico Fermi Institute, The University of Chicago, 5640 South Ellis Avenue, Chicago, Illinois 60637. USA
The techniques of nonimaging optics have permitted the production of a world-record intensity of sunlight, 72 W/mm2, by using a sapphire concentrator. Such an intensity exceeds the intensity of light at the surface of the Sun itself (63 W/mm2) by 15% and may have useful applications in pumping lasers, which require high intensities of light to function. The author describes the production of high-intensity sunlight and reports its application in generating over 3 W of laser power from a 72.5-cm-diameter telescope mirror at an efficiency exceeding that typically attained in approaches not involving nonimaging optics.
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A total of 95,000 sums were expected (73.3% of geometrical unit).
The net primary efficiency was 85.5%; the net secondary efficiency was 85.7%; the overall efficiency was 73.3%.
Because the author does not state Pi, it is taken to be the product of three factors: an incident intensity of 800 W/m2, the area of the collecting mirror, and an optical relay efficiency of 0.6.
Because the author does not state Pi, it is taken to be the product of the power delivered by the furnace, 55 kW, and an optical relay efficiency of 0.6.
A total of 95,000 sums were expected (73.3% of geometrical unit).
The net primary efficiency was 85.5%; the net secondary efficiency was 85.7%; the overall efficiency was 73.3%.
Because the author does not state Pi, it is taken to be the product of three factors: an incident intensity of 800 W/m2, the area of the collecting mirror, and an optical relay efficiency of 0.6.
Because the author does not state Pi, it is taken to be the product of the power delivered by the furnace, 55 kW, and an optical relay efficiency of 0.6.