NASDA GEO LASER Concept: GEO-based laser transmission. Key Features: 1.2 km diameter SPS with "quantum box driven semiconductor laser" ground PV receiver diameter of 1.2 km with 1 kW/m2 power density Suggestor/Source: M. Mori and T. Ohue of NASDA and H. Nagayama and T. Hanyu of the Mitsubishi Research Institute Discussion The concept was shown at the WPT 95 conference in Kobe, Japan. It is interesting to note that NASDA (which is generally responsible for large scale space transportation in Japan) is the lead player in this paper along with the Mitsubishi Research Institute (which served as the coordinator for the MITI induced Japanese 3 year Solar Power Satellite Feasibility Study from 1990 through 1993.) The paper provides some details on the average efficiencies of the laser system and has a laser conversion efficiency of 40%, atmospheric losses of 20% (or efficiency of 80%) and Laser DC conversion efficiency of 70%. References M. Mori, et al. “Solar Energy Exploitation Using an Innovative Space Infrastructure,” Wireless Power Transmission 95 Conference, Kobe Japan, October 16-19, 1995. To be published in the Space Energy and Transportation Journal. Advantages Disadvantages Reduces receive site area requirements significant laser development issues, not an all weather system atmospheric attenuation issues laser safety concerns
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