Not only that, it's physically impossible to have a perfectly collimated beam, as it would require infinite energy. The best you can do is use a Bessel beam approximation: https://en.wikipedia.org/wiki/Bessel_beam …
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That's a wild idea, but I have no answer and I don't know if it's been looked into. The energy density is probably not high enough to significantly counter dispersion. Either way, it would probably be a nice article.
That is interesting..I agree with Lucas’ statement.. though I’m not sure if the gravitational effects (should the energy density be great enough) would result in collimating Although it does (intuitively, for me) seem to work in the limit of infinite beam energy
