Wow, you found mathematically perfect lenses that do not have any surface imperfections?
A manufacturer that can guarantee zero alignment error (even down to the nanoradian!), and a crack team that can design for absolutely no thermal expansion/contraction problems?
A lens form for vanishingly-near-zero aberration (Certainly, someone of your intellectual caliber would, after all, know lasers have variations from their stated value due to manufacturing flaws), and constructed from a material that has near perfect transmittance in the given wavelength of laser?
Please, do tell me how you will manage to correct for the small but nonzero amount of atmosphere at high altitude, which would also introduce diffraction that would have to be corrected for in real time to hit the target with that 'microns wide' beam while also attenuating the amount of light from scattering and absorption.
I'd also love your opinion on spacecraft thermal management, and how you'll put this umpteen-kilowatt laser in orbit and fire it without melting the laser discharge tube, the metal holding the tube, the optics focusing the beam onto a microns-thin point that'll put even more thermal stress on the spacecraft's optics than the target's own, and also how you'll fire it without melting the rest of the spacecraft. Furthermore, I'd like to hear how this thermal management solution, laser, optics package, and spacecraft bus will be small and light enough to fit on a small, lightweight military booster that can be launched on a moment's notice without providing warning to enemy state actors to attract cruise missiles or other ballistic bombardment.
Please try to keep up, here. I'm genuinely curious.