In: Physics
Consider Fraunhofer diffraction of coherent light (e.g., a laser beam) from a double slit.
Use Matlab (or some other program) to calculate and plot the diffraction pattern you would expect from two slits, each 0.230 mm wide, with a center-to-center separation of 0.853 mm, on a screen that is 62.3 cm downstream of the slit, when illuminated by a helium-neon laser (??=633 nm). Turn in a printout of your plot – which should have properly labeled axes, etc., of course!
The two phase difference parameters are,
So, the intensity distribution of Fraunhofer diffraction,
Plotting this we get,
X represents theta and Y represents intensity.
the blue line is contribution of the interference alone and the red line is when we include difraction with it too. A is taken 1 when plotting the curve, so the maximum intensity is 4.