How to create grating diffraction pattern.

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')

[Star Strider]

@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?

Answer 1

[KALYAN ACHARJYA]

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');

[Rose Mermate]

I want to have many peaks like in the picture.

[KALYAN ACHARJYA]

What is m in the attched code?

[Rose Mermate]

m = diffraction order

[KALYAN ACHARJYA]

No "m" in the code

[Rose Mermate]

Not in the equation

[KALYAN ACHARJYA]

Refer the book and incorporte "m" in the equation. If you explain the physics (Maths), so that we can help you to implement the same.

[Prathamesh Chavan]

M is a order of principal maxima..

[OzjaszGoldberg]

hi did you make it ?