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Author Kare, J. T. ♦ Mitlitsky, F. ♦ Weisberg, A.
Sponsorship USDOE
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword POWER TRANSMISSION AND DISTRIBUTION ♦ POWER TRANSMISSION ♦ PHOTOVOLTAIC CELLS ♦ LASER POWER TRANSMISSION ♦ SEMICONDUCTOR LASERS ♦ SILICON SOLAR CELLS ♦ RADIATION FLUX ♦ FEASIBILITY STUDIES
Abstract A preliminary demonstration of free-space electric power transmission has been conducted using non-coherent laser diode arrays as the transmitter and standard silicon photovoltaic cell arrays as the receiver. The transmitter assembly used a high-power-density array of infrared laser diode bars, water cooled via integrated microchannel heat sinks and focused by cylindrical microlenses. The diode array composite beam was refocused by a parabolic mirror over a 10 meter path, and received on a {approximately}15{times}25&hthinsp;cm panel of thin film high efficiency silicon solar cells. The maximum cell output obtained was several watts, and the cell output was used to drive a small motor. Due to operating constraints and unexpected effects, particularly the high nonuniformity of the output beam, both the distance and total received power in this demonstration were modest. However, the existing transmitter is capable of supplying several hundred watts of light output, with a projected received electric power in excess of 200 watts. The source radiance is approximately 5{times}10{sup 9}&hthinsp;W/m{sup 2}-steradian. With the existing 20 cm aperture, useful power transmission over ranges to {approximately}100 meters should be achievable with a DC to DC efficiency of greater than 10{percent}. Non-coherent sources of this type are readily scalable to powers of tens of kilowatts, and with larger apertures can be used directly for power transmission up to several kilometers. Future non-coherent diode laser sources may be suitable for power transmission over hundreds of kilometers. Also, the experience gained with non-coherent arrays will be directly applicable to power beaming systems using coherent diode arrays or other array-type laser sources. {copyright} {ital 1999 American Institute of Physics.}
ISSN 0094243X
Educational Use Research
Learning Resource Type Article
Publisher Date 1999-01-01
Publisher Department Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publisher Place United States
Volume Number 458
Issue Number 1
Technical Publication No. CONF-990103-
Organization Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)


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