- #1
Aprtaenl
- 7
- 1
Homework Statement
Hi
The experimental setup involved a helium neon laser of wavelength 670nm +- 1nm, pointed towards a lens with focal length 500mm +- 1mm. (so that the equations used corresponded to the far field diffraction pattern) and onto a photo diode so that for all intents and purposes the voltage is proportional to the Intensity.
For a diffraction coarse grating consisting of a large number of slits, i collected data approximately 30 point.
Homework Equations
I am using this equation
Intensity Formula.png
which is a product of double slit interference and single slit diffraction.
From this I what to determine the finite distance of the slits (a) and the distance between the slit separation (d).
I believe I also need to use the equations which describe the distance between successive maxima and minima respectively.
maxima and minima equations.png
Can someone please explain how to obtain the values of a and d, from these equations and (potentially my data plot, additionally if anyone has any knowledge on python and could tell me what kind of function i need (i think it might be sin^2x multiplied by a gaussian envelope) but am not sure.
The Attempt at a Solution
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I am attempting to plot a graph of the intensity as a function of distance on python but have not been able to produce the fit yet, so am attaching a dot to dot fit produced on excel to contextualise the results, where on the x-axis i have position and on the y-axis i have intensity(voltage).