## free electron laser

https://doi.org/10.1351/goldbook.F02514
Source of @C01130@ in which the @A00106@ is an electron beam moving at speeds close to the speed of light in the spatially periodic magnetic field produced by an array of magnets (the wiggler). The emitted @W06659@, $$\lambda _{\text{L}}$$, is approximately given by $\frac{\lambda _{\omega }}{4\ E^{2}}$ with $$\lambda _{\omega }$$ being the wiggler period and $$E$$ the electron's energy in $$\mathrm{MeV}$$.
See:
laser
Source:
PAC, 1996, 68, 2223. (Glossary of terms used in photochemistry (IUPAC Recommendations 1996)) on page 2244 [Terms] [Paper]