Light-induced electron pulse amplifies electromagnetic waves
The laser is among the most far-reaching innovations of the twentieth century, and its impact shows no signs of diminishing. The light created by lasers is exceptionally bright, and its phase — the degree to which the light waves are in step with each other — remains stable over long distances.
However, laser light is typically restricted to a very narrow range of wavelengths. This limitation prompted the development of a device known as the free-electron laser, which can emit light at almost any wavelength. The problem is that free-electron lasers usually require high-power devices housed in large-scale facilities. Now, in
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