摘要
以矢量合成法说明N条狭缝衍射光相干形成次极大光强的具体原因。对应于第J级次极大光强,相邻狭缝衍射光的振动位相差为[(2J+1)π]/N,N个矢量的合成最多只有(N—1)/2种图,其形状取决于比值(2J+1)/N=n/m,(N—m)条狭缝的衍射光相消相干。
Using the method of adding vectors,this article explains the reason why the secondary maxima intensity can be produced by interference effects of the diffractive light issuing from N narrow slits.The vibrational phase difference of the light issuing from a slit and an adjacent slit is v=(2J+1)π/N,corresponding to the Jth order secondary maxima intensity.There are only(N-1)/2 various diagrams,which are composed of N vectors.The diagrams' forms are decided by(2J+1)/N=n/m.The diffractive light issuing from(N-m) narrow slits results in completely destructive interference.The ratio of the secondary maxima intensity to the light issuing from one grating element is 1/sin2(nπ/2m).
出处
《北京航空航天大学学报》
EI
CAS
CSCD
北大核心
1990年第3期93-98,共6页
Journal of Beijing University of Aeronautics and Astronautics
关键词
衍射
光强
光栅
次极大
矢量
diffraction intensity,secondary maxima,vector,vibration,phase difference,destructive interference.
