A=∑Acxp(p) A=∑Aex(id0) P A=A2()=Nm(ma,k)∑e(mbk)∑epck)=A,G n=0 N1-1 G=∑exp(mk)∑ex(mbk)∑exp(ck) m=0 n=0 sin2naok sin 2N bok sin 2-nacok sin2 aok sin2b·ksn2c·k 2 称为干涉函数。=  p p A = A exp(i) p p A A exp(i) =  p p A A exp(i) A A i A im in ip Ap G N p N n N N m c = p = p       = − = − = − = 1 0 1 0 1 0 1 2 3 exp( ) exp( a k) exp( b k) exp( c k) exp( ) exp( ) exp( ) 1 0 1 0 1 0 1 2 3 =  a k  b k  c k − = − = − = N p N n N m G im in ip c k N c k b k N b k a k N a k G • • • • • • = 2 1 sin 2 1 sin 2 1 sin 2 1 sin 2 1 sin 2 1 sin 2 3 2 2 2 2 2 1 2 2 称为干涉函数