lasers to generate plasma in atmosphere

I'm wondering what kind of laser, I'm guessing something between
ultraviolet and X-ray, and how much power would it take to create a
thin beam (a few mm) of plasma in atmosphere from the laser source to
50+ meters away? If the distance is too far, then how about for 1m?

I'd be happy with a few equations to answer my questions. Google
search, for once, doesn't seem to even come close to an answer for
this.
.

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