HOLOGRAPHY IN SOLAR ENERGY
Northeast Photosciences Inc of Hollis NH, has developed a holographic device that promises to greatly improve the efficiency of solar energy conversion. The company's single element hologram spectrally separastes light and focuses it perpendicularly to the hologram in a thin concentrated line. By spectrally separating light, the hologram lets two or more different solar cells absorb only those wavelengths that each cell most efficiently converts to electrical power. The side focus also improves solar cell efficiency by eliminating shadow effects. Another advantage of this technology is reduced cooling requirements; spectral separation prevents overheating by diffracting unwanted infrared radiation away form the cells, while the side focus replaces the common but difficult to cool stacked design with a side by side design.
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