Young's double slit experiment

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To repeat Young's double slit experiment with a diode laser, ensuring the light is coherent at the slits is crucial. Enclosing the setup to prevent external light interference and attenuating the laser to allow only one photon at a time can effectively demonstrate quantum behavior. Scanning a photomultiplier across the interference pattern will reveal results consistent with wave behavior. The distance between the slits should be optimized based on the wavelength of the radiation, with suggestions indicating that distances below 10 micrometers may be appropriate. This setup serves as a clear illustration of the principles of quantum mechanics.
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What would be the best set up to repeat Young's double slit experiment with a diode laser?
 
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As long as the light is coherent when it hits the slits, any set up should be fine.

A good experiment to try if you have a photomultiplier is to enclose the experiment so no light can get in. Attenuate the laser until only one photon is present in the box at anyone time (on average). Scan the photomultiplier across the interferance pattern and show that it matches the pattern that would be expected for a macroscopic wave traveling through the slits.

It is a simple illustration of the quantum behaviour of light.

Claude.
 
Sounds like a good experiment...either way, is there an optimum distance to have between the two slits?
 
Though it should depend on the wavelenght of the radiation,I guess anything below 10\mu m would do.

I may be wrong,i'm just another ordinary theorist.
 
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