略語大辞典 [L] 36 FEL free-electron laser 自由電子レーザー. 相対論的電子ビームを周期磁場に通過させてシンクロトロン放射で光を発生させる方式の可同調レーザー.free-electron laser; a tunable laser that employs a REB(relativistic electron beam) passing through a periodic transverse magnetic field, the so-called undulator or wiggler, to amplify an EM(el 丸善「略語大辞典」JLogosID : 11874765