CONTRIBUTION OF CNRS [Translated] The idea for a comparative study of laser and microwave transmission of energy, of a limited power depending on the demonstration objective, can be rapidly undertaken, including for the laser option. Laser Power Photovoltaic cells of Gallium Arsenide, for which the architecture was specially designed to function in 'monochromatic solar cell*, was achieved (cf. paper from the last International Conference of the IEEE PVSC Experts. Las Vegas, October 1991, presented by our laboratory. LPSES) : an efficiency of 52.3% was measured at the wavelength =810 nm. It is important to rapidly know the wavelength emission of the type of laser which will be selected for the project. In fact, LPSES is working on a project for the multi-spectral photovoltaic conversion of the solar energy (‘rainbow’ cells), which could provide the monochromatic solar cell with the optimal performance for the wavelength selected. The choice of a good conductor substrate could improve the performance of cells at high flux. The germanium that we have used for a long time is interesting from the additional point of view of its elevated mechanical performances. For a very rapid realisation of the EUROSPACE project, in our opinion, the combination laser/solar cell to use is: • Laser Diode Array (LDA) (Al,Ga)AS / GaAs solar cell.
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