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xyz60301

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[求助] 求救, 用Matlab fft作光学仿真已有2人参与

С?????????????
???????????й????????γ????沨,
?????????????????????????????λ????????Σ????????ο????λ?ò??????,???????????(?D?1)

???????????Fourier Optics????д??????????????д?????Fresnel Diffraction Integration????????????????????????????????????? (?D?2)

????????????????
E1 = E0.*pupil.* exp(-1i*k/(2*f)*r1.^2) ; E0=1%??沨

pupil???????С,??0.1m,????1m
???E1???????????????????????????

?????????????????????????????????θ???????

????????????????????????
???????·?????????????????????????θ??????????????????????????????????????

???λ?????????

PS: ?????????????????????м?????????,??????D???????sinc

PS2: ??????????????????????????????仯???????????s?l?F???????,?????L???????,?@???????????!?

?D?1.png

?D?2.png

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1楼 2014-05-25 10:20:47

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xyz60301

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3楼: Originally posted by myredleaf at 2014-05-25 14:00:57
看我的帖子，有一个MATLAB的光学仿真扩展包，你可以用来验证一下结果

补上code,这样应该没错吧
m=1;
cm=1e-2*m; mm=1e-3*m; nm=1e-9*m;

size=0.5*m; lambda=633*nm; f=1*m;
z=1*m-100e-6; R1=0.1;R2=2e-6;
N=2^10;

F=LPBegin(size,lambda,N);
F=LPCircAperture(R1,0,0,F);
I0=LPIntensity(0,F);

F=LPLens(f,0,0,F); F=LPFresnel(z,F);
I1=LPIntensity(0,F);
Fhigh_freq=LPCircAperture(R2,0,0,F);
Fhigh_freq=LPFresnel(1,Fhigh_freq);

Ihigh_freq=LPIntensity(1,Fhigh_freq);

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5楼2014-05-25 14:24:14

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xyz60301

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補上Matlab Code
clear all
wvl=632.8e-9; delta2=2e-7;f=1;Dz=1.002;N=2^10; pinr=10.1e-7;
L=wvl/delta2*Dz ;
k=2*pi/wvl; delta1= L/N;

[x1 y1] = meshgrid((-N/2 : N/2-1) * delta1);
x1_0 = (-N/2 : N/2-1) * delta1 ; y1_0 = x1_0 ;

%建立Lens
r1 = sqrt(x1.^2 + y1.^2);
pupil = r1 <= (0.1)* ones(N,N);
E0=1;
E1 = E0.*pupil.* exp(-1i*k/(2*f)*r1.^2) ;

[x2 y2] = meshgrid((-N/2 : N/2-1) / (N*d1)*wvl*Dz);
ft2(g, delta)=fftshift(fft2(fftshift(g))) * delta^2;
% evaluate the Fresnel-Kirchhoff integral
Uout = 1 / (i*wvl*Dz) .* exp(i * k/(2*Dz) * (x2.^2 + y2.^2)) .* ft2(Uin .* exp(i * k/(2*Dz) ...
* (x1.^2 + y1.^2)), d1);

x2_0=x2(1,

;y2_0=x2_0;

%加上pinhole

[E3,I3,II3, x2,y2 ] = addpinhole(E2,x2,y2,pinr);

%傳播
Dz2=100e-6;
[E4, x3, y3] =one_step_prop(E3, wvl, delta2, Dz2); (同 Fresnel-Kirchhoff integral)
x3_0=x3(1,

;y3_0=x3_0;
I4= abs(E4).^2;

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2楼2014-05-25 11:01:43

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