How to create grating diffraction pattern.

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Rose Mermate
Rose Mermate 2020-3-2
编辑： KALYAN ACHARJYA 2024-12-30
How to create a code to plot the intensity of the light I see from the grating diffraction in theory.
The graph shows only the diffraction ranking at zero. I want the graph to show the first number diffraction.
Who can see if it might go wrong? Please help me.
x = linspace(-50, 50, 500);
A = 4*W;
lambda = 632.8e-9; % m
D = 1; % Distance to the observation plane m
W = 38e-6; % slit width(m)
fx = x/(lambda*D); % frequency coordinat
I = (A^2/(lambda^2*D^2)) .* sinc(2*W*fx).^2;
figure
plot(x, I)
grid
xlabel('fx')
ylabel('Intensity')
  1 个评论
Star Strider
Star Strider 2020-3-2
@Rose Mermate —
You quoted the code I posted in your other Question: How to create a code to plot the intensity of the light
That should do everything you want.
What part of my Answer do you need help to understand?

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KALYAN ACHARJYA
KALYAN ACHARJYA 2020-3-2
编辑：KALYAN ACHARJYA 2024-12-30
Ran in:
x = linspace(-50, 50, 500);
lambda = 632.8e-9; % m
D = 1; % Distance to the observation plane m
W = 38e-6;
A = 4*W;% slit width(m)
fx = x/(lambda*D); % frequency coordinat
I = (A^2/(lambda^2*D^2)) .* sinc(2*W*fx).^2;
figure, plot(x,I)
grid
xlabel('fx')
ylabel('Intensity');
% Just repeat the same row multiple times
% For Better visualisation
grad_pattern=repelem(I,[50],[1]);
figure,imshow(grad_pattern,[]);
title('Diffraction Pattern');
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