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A free-electron laser (FEL), is a type of laser that uses very-high-speed electrons that move freely through a magnetic structure, hence the term free electron as the lasing medium. The free-electron laser has the widest frequency range of any laser type, and can be widely tunable, currently ranging in wavelength from microwaves, through terahertz radiation and infrared, to the visible spectrum, ultraviolet, and X-ray.

The term free-electron lasers was coined by John Madey in 1976 at Stanford University. The work emanates from research done by Hans Motz and his coworkers, who built an undulator at Stanford in 1953, using the wiggler magnetic configuration which is the heart of a free electron laser. Madey used a 43-MeV electron beam and 5 m long wiggler to amplify a signal.


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