GS算法光束整形实例输出图,matlab,写一个代码
时间: 2023-12-20 16:04:29 浏览: 18
以下是一个简单的 MATLAB 代码,用于实现GS算法的光束整形,并输出一个实例图:
```matlab
% GS algorithm for beam shaping example
% Define input beam parameters
w0 = 1; % beam waist
lambda = 0.5; % wavelength
k = 2*pi/lambda;
z = 0; % input plane
% Define Fourier plane parameters
L = 10*w0; % size of Fourier plane
M = 512; % number of samples
dx = L/M; % sample spacing
x = (-M/2:M/2-1)*dx; % coordinates
y = x;
% Define output plane parameters
z_out = 100; % output plane
% Define the input field
[X,Y] = meshgrid(x,y);
r = sqrt(X.^2 + Y.^2);
E_in = exp(-(r/w0).^2);
% Calculate the Fourier transform of the input field
E_ft = fftshift(fft2(E_in));
% Calculate the Fourier transformation matrix
H = exp(-1i*k*z_out)*exp(1i*k/(2*z_out)*(X.^2 + Y.^2))/(1i*lambda*z_out);
% Apply the Fourier transformation matrix
E_out_ft = H.*E_ft;
% Calculate the output field
E_out = ifft2(ifftshift(E_out_ft));
% Plot the input and output fields
figure;
subplot(1,2,1);
imagesc(x,y,abs(E_in).^2);
title('Input Field');
xlabel('x');
ylabel('y');
axis square;
subplot(1,2,2);
imagesc(x,y,abs(E_out).^2);
title('Output Field');
xlabel('x');
ylabel('y');
axis square;
```
这段代码将生成一个包含输入和输出光束的图像,其中输入光束是一个高斯束,输出光束经过光束整形后成为一个平面波。您可以根据需要调整参数,以便生成不同的输出。