略語大辞典 [Opt] 29 TDL times diffraction limited 回折限界ビーム広がり角倍数. 回折限界ビーム広がり角を単位とした光ビーム特性の表現. times diffraction limited; a unit for the definition of an optical beam quality; e.g. 2 TDL; e.g. the TDL of a laser; [Opt:L:Phys]. 丸善「略語大辞典」JLogosID : 11851636