第五单元夫衍射实例.pptVIP

二.正絃型振幅光柵 Sinusoidal Amplitude Grating 整理 忽略交叉项条件 Matlab Grating Example 1 Grating Efficiency光柵效率 色散与分辨本领 三.圆孔的夫琅和费衍射 圆域函数的FB变换介绍 Cylinder, diameter = D Cylinder, diameter = 2D Cylinder, diameter = ? D Shifted Cylinder Phase-Shifted Cylinder 四，双缝衍射图样 单缝衍射,双缝干涉图样周期 多缝衍射图样 多缝衍射图样 Interference of two apertures Effect of Aperture Shape Interference of two apertures Moving apertures closer together Interference of three apertures Effect of Multiple Apertures *Two-Slit Diffraction Two-Slit Diffraction, Narrow Slits Multiple Slits Effect of Slit Separation 8w 8b *是定义的单位长度, input output output, logarithmically scaled [out in] = fourier(@func1); function f = func1(x,y) f = cyl(x+1,y,0.5)+cyl(x-1,y,0.5); output not logarithmically scaled 8w 8b [out in] = fourier(@func1); function f = func1(x,y) x0=0.5; f = cyl(x+x0,y,0.5)+cyl(x-x0,y,0.5); output not logarithmically scaled 8w 8b [out in] = fourier(@func3); function f = func3(x,y) d=2; n=1; f = zeros(size(x)); for i=-n:n f = f + cyl(x-i*d,y,0.5); end output not logarithmically scaled 8w 8b 2 3 5 -4 -3 -2 -1 0 1 2 3 4 0 0.2 0.4 0.6 0.8 1 -4 -3 -2 -1 0 1 2 3 4 0 0.2 0.4 0.6 0.8 1 fourier1(@func1); hold on; x = linspace(-4,4,100); y = sinc(0.5*x); y = y.*y; plot(x,y); function f = func1(x) f = rect(x-0.5,0.5) + rect(x+0.5,0.5); fourier1(@func1); hold on; x = linspace(-4,4,100); w = 4/32; y = sinc(w*x); y = y.*y; plot(x,y); function f = func1(x) w = 4/32; d = 1; f = rect(x-d/2,w) + rect(x+d/2,w); -4 -3 -2 -1 0 1 2 3 4 0 0.2 0.4 0.6 0.8 1 -4 -3 -2 -1 0 1 2 3 4 0 0.2 0.4 0.6 0.8 1 # * * 2.4 夫琅和费衍射实例 第2章 标量衍射的角谱理论 一.矩孔的夫琅和费衍射 设矩孔的边长分别为a和b,用单位振幅的单色平面光波垂直照明,如图5-3所示,求衍射屏后距离为z的观察面上的夫琅和费衍射分布. 图5—3 矩孔的夫琅和费衍射 x x1 y y1 z b o a z 夫琅和费衍射实例 单位振幅的单色平面光波垂直照明，衍射屏后表面的复振幅U0(x1,y1)就等于屏的透射系数t(x1,y1),即 U0(x1,y1)=t(x1,y1)=rect(x1/a,y1/b) (5--16) 得到观察屏上的复振幅分布为 （5--17） 衍射图样的强度分布为