free-electron laser

noun
free-elec·tron laser | \ ˈfrē-i-ˈlek-ˌträn- \

Definition of free-electron laser 

: a laser that can be tuned over a wide range of frequencies and that produces electromagnetic radiation by the motion of electrons moving at relativistic velocities in a magnetic field

First Known Use of free-electron laser

1978, in the meaning defined above

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The first known use of free-electron laser was in 1978

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