POWERSAT Key issues Basic research whose results should be useful after feasibility model demonstration Laser efficiency • Solid State Lasers : Solar pumping, diode pumping, new crystals... • New concepts (spacebome LEL ?) • Laser beam quality, even at higher mean power (near the diffraction limit) —> Achieve, within 10 years. IQkW at l^m. diffraction limited, with 30 to 50% wall plug efficiency Tracking * Subgrd tracking and focusing (with active or adaptive optics), useful if there is a commercial need for energy transmission over 100km
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