Space Power Supply Networks Using Laser Beams M. DUCHET,L. CABARET, A. LAURENS, J.C de MISCAULT* Summary This paper describes laser-based space power supply networks which could perhaps be feasible within several decades. These networks could be used to supply energy to satellites in low earth orbit (LEO) or geostationary earth orbit (GEO), either to meet extra energy requirements or to allow a shift in orbit. In addition, they could be used to transmit energy towards the Earth or lunar bases, as well as many other space power applications. Also described are the different types of lasers which could be used in such networks, and the advantages of these networks in terms of satellite design. Introduction Following are four examples of laser based space power supply networks that could perhaps be feasible within several decades. Future power needs in space The concept of a space power supply using laser beams appears very promising to supply energy to satellites, for their excess internal needs or to maintain their orbit or to change it, as well as to supply power to lunar bases, to transmit energy from space to Earth or for many other space applications. A study by EUROSPACE 1 indicates that space energy needs will show considerable growth after 1995. Description of different networks 1 Low orbit laser supply network without relay mirrors Figure 1 describes a low orbit laser supply network without relay mirrors designed mainly to supply power to low earth orbit (LEO) or geostationary earth orbit (GEO) satellites or lunar bases from lasers in LEO. The LEO laser satellite comprises large solar panels or light concentrators. It must be located at an average altitude of about 1000 km in order to avoid the residual atmospheric braking effect and therefore provide the required long life span. * Laserdot, route de Nozay, 91460, Marcoussis, France M. Toussaint-Eurospace, 16 bis Avenue Bosquet, 75007 Paris, France, J.P. Gex-Sylarec, route de Nozay, 91460, Marcoussis, France.
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