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...and that would mean that at 2km the spot diameter would be 6-12 feet ! That would mean 1.5 - 3 feet spot diameter at 2km distance. Is this the best a $5000 can buy ? Your reply assumes that this is for communications and "receiving" , seeing or detecting the amplitude modulation of the...

What optics do you suggest ot focus it to a minimum at 2km distance? ...and what would be the minimum spot diameter with your solution ? At 2km the altitude requirement is trivial. ~16cm.

That uses a parabolic mirror doesn't it? Also, do you mean to input the light at the focal point of that mirror ...or apply the light source to the secondary mirror?

I have an actual task

The 200mm is the beam diameter at the output optics. Obviously, the entire device (including the output optics) is larger and 3 dimensional, thus do describe its size, I would need to give you three separate dimensions, however I am not limited by them, so I just wrote: "Any". As far as as the...

What's the smallest spot diameter at 2000m distance that $5000 will buy ? For a Gaussian beam profile let's assume the radius of the spot to be where its intensity falls off to 14% (1/e^2) of its on-axis intensity. Power: ~1mW Wavelength: Any (including non-visible) Maximum beam diameter at...