略語大辞典 [L] 31 BTDFL birefringent tuning double frequency laser 複屈折同調2波長レーザー. birefringent tuning double frequency laser; a laser tuned by a quartz crystal plate coated by antireflecting films on both faces; [L:Opt:Mat:Phys]. 丸善「略語大辞典」JLogosID : 11868021