Abstract

We report the first operation of a compact free-electron laser at wavelengths in the range between 2 and 2.6 mm with an output power up to 1 kW in 4 μs pulses. The innovative characteristic of this device, driven by a 2.3 MeV microtron, is its considerable small size, obtained by using a short undulator with a 2.5 cm period and a length of 22.5 cm.

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