fi 相位差△q=2兀 A=±k4.k=0.1.2 >干涉加强飞△=王2k兀,k=0,1,2, A=士(2k+1)一,k=0,1,2, 干涉减弱 △q=±(2k+1)元,k=0,1,2,* 1 s P 1 * r 2 s 2 r n Δ k , k 0,1,2, 2 k π ,k 0 ,1,2 , Ø 干涉加强 λ Δ 2π Δ 相位差 Ø 干涉减弱 , 0,1,2, 2 Δ (2k 1) k (2k 1)π , k 0,1,2,