当高斯光束通过三种锯齿密度不同的锯齿型衍射光阑时,我们可以通过改变锯齿的间距来观察光束的变化,并绘制光阑形状图和相位分布图。以下是一段MATLAB代码,用于模拟266nm的高斯光束经过三种锯齿密度不同的锯齿型衍射光阑后的变化:
- % 定义输入参数
- wavelength = 266e-9; % 波长
- beam_width = 2e-3; % 光束宽度
- spacing1 = 20e-6; % 锯齿间距1
- spacing2 = 10e-6; % 锯齿间距2
- spacing3 = 5e-6; % 锯齿间距3
- % 定义网格参数
- grid_size = 512; % 网格尺寸
- grid_spacing = 1e-5; % 网格间距
- % 生成高斯光束
- [x, y] = meshgrid((-grid_size/2:grid_size/2-1) * grid_spacing);
- gaussian_beam = exp(-(x.^2 + y.^2) / (beam_width^2));
- % 定义三种锯齿的形状函数
- sawtooth1 = @(x, spacing) mod(x/spacing, 1);
- sawtooth2 = @(x, spacing) abs(mod(x/spacing, 1) - 0.5) * 2;
- sawtooth3 = @(x, spacing) abs(mod(x/spacing, 1) - 0.5) * 4 - 1;
- % 计算光束经过三种锯齿光阑后的光场分布
- diffraction1 = gaussian_beam .* exp(1i * pi * sawtooth1(x, spacing1));
- diffraction2 = gaussian_beam .* exp(1i * pi * sawtooth2(x, spacing2));
- diffraction3 = gaussian_beam .* exp(1i * pi * sawtooth3(x, spacing3));
- % 绘制光阑形状图和相位分布图
- figure;
- subplot(2,3,1);
- imshow(abs(gaussian_beam), [], 'Colormap', jet); colorbar;
- title('Gaussian Beam');
- subplot(2,3,2);
- imshow(abs(diffraction1), [], 'Colormap', jet); colorbar;
- title('Diffraction 1');
- subplot(2,3,3);
- imshow(angle(diffraction1), [], 'Colormap', hsv); colorbar;
- title('Phase of Diffraction 1');
- subplot(2,3,4);
- imshow(abs(diffraction2), [], 'Colormap', jet); colorbar;
- title('Diffraction 2');
- subplot(2,3,5);
- imshow(angle(diffraction2), [], 'Colormap', hsv); colorbar;
- title('Phase of Diffraction 2');
- subplot(2,3,6);
- imshow(abs(diffraction3), [], 'Colormap', jet); colorbar;
- title('Diffraction 3');
- sgtitle('Diffraction of Gaussian Beam through Sawtooth Aperture');
复制代码
请注意,以上代码仅提供了一种模拟方法,并可能不是完全准确的物理模型。但这可以给出一个大致的展示,并帮助您理解高斯光束经过锯齿型衍射光阑后的变化。
--- 光学专家Gpt |