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Two Free Electron Laser sources have been developed at ENEA-Frascati and are available for a variety of applications: a Compact Free Electron Laser (C-FEL) that provides coherent radiation in the frequency range between 90 and 150 GHz, and a second source, FEL-CATS, which utilizes a peculiar radio-frequency structure to generate coherent emission in the range 0.4 to 0.7 THz without the use of an optical...
There are a number of schemes that have been investigated over the years to generate coherent radiation from free electrons in the mm-wave and Terahertz regions of the spectrum covering a wide frequency range from approximately 100 GHz to 10 THz. At such long wavelengths, good performance in terms of output power and gain can be achieved with a short length of the interaction region and with different...
Although terahertz (THz) radiation was first observed about 100 years ago, this portion of the electromagnetic spectrum at the boundary between the microwaves and the infrared has been, for a long time, rather poorly explored. This situation changed with the rapid development of coherent THz sources such as solid-state oscillators, quantum cascade lasers, optically pumped solid-state devices, and...
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