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lightcraft
A lightcraft is a space- or air-vehicle driven by laser propulsion. Laser propulsion is in early stages of development. Lightcraft uses an external source of laser or maser energy to provide power for producing thrust. The laser/maser energy is focused to a high intensity in order to create a plasma. The plasma expands, producing thrust.〔
A lightcraft is distinct from a solar sail because it is dependent on the expansion of reaction mass to accelerate rather than being accelerated by light pressure alone.
==Types==
In one type of lightcraft, the laser shines on a parabolic reflector on the underside of the vehicle that concentrates the light to produce a region of extremely high temperature. The air in this region becomes heated and expands violently in a laser-supported detonation, producing thrust.
In other lightcraft concepts, the laser arrives at the vehicle from above, and operates as an ablative laser tractor beam. This may have applications in the removal of space debris.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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