Using beams of low-energy electrons ($E<5$ MeV), a free-electron laser can be operated as a continuously tunable (1000 <λ<50 μm), high-power ($P>10$ kW, cw) source of laser radiation. With electrostatic accelerators the electron beam can be recycled to increase the overall efficiency of the laser. Wall power to laser power efficiencies greater than 10% are possible.
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Luis R. Elias (1979) studied this question.
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