N'ime free-electron laser (FEL), a relativistic electron beam na-agafe site na a ụzọ nke undulators na-ebu arrays nke dipole nju onye ubi na-ezo na-agbanwe agbanwe ntụziaka. The electrons emit synchrotron radieshon na coherently interacts na otu electrons ike amplify na radieshon ubi na resonance ugboro. FEL nwere ike emit a coherent elu-egbukepụ egbukepụ electromagnetic radieshon na a obosara nso nke frequencies, si microwaves ka adụ X-rays. Ndị a ngwaọrụ na-eji na n'ichepụta, nkwurịta okwu, na ọgwụ ngwa, dị ka adụ anụ ahụ ịwa ahụ.
coherent elu-egbukepụ egbukepụ electromagnetic radieshon