Phys.org  July 16, 2021 An international team of researchers (UK, the Netherlands) conducted a proof-of-principle experiment in the ultraviolet spectral range to demonstrate a new way of producing coherent light. In FELs the intensity of light is amplified by a feedback mechanism that locks the phases of individual radiators. This is achieved by passing a high energy electron beam through the undulator. As they wiggle through the undulator light emitted from the electrons bunch together causing amplification of the light and the increase in its coherence. If the electron bunch is shorter than the wavelength of the light produced by […]