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That's correct, the wavelength is the theoretical cut off. However it is a based on the wavelength and its M2 factor. You would have to have both a perfect M2 beam, and a very short focal length lens to get anywhere near the spot size equivalent of its wavelength. Also the rayleigh length would be extremely short.
Edit: Off topic. Found this interesting if anyone wants to take a look
Edit: Off topic. Found this interesting if anyone wants to take a look
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