Recent content by jbe

So youre saying that after the beam waist, the focused laser will have the same divergence as the parallel at aperture(collimated) laser? How come this isnt witnessed in handheld lasers?

Yes I know it will never be infitesimally small, and I know of Gaussian beams and that focusing to infinity will give the least possible divergence. But, if one had a huge aperture(50m+) and something like far-UV or shorter, would it be possible to focus out to say 100,000km? Would it be...

Thanks yall, Im not trying to do anything like this just wondering about some of the stuff NASA and ESA are doing. Check these out: ESA Science & Technology: Spacecraft A 1W laser at 5,000,000 km?! Im pretty sure theyre using the lasers to remain fixed to detect gravitational radiation. Would...

Hi yall, newbie here. Ive been lurking for a while and decided to join. Main thing Ive been wondering is, is there a limit to how far one can focus a to? For example, would it possible to focus a laser to like 5 light-seconds or so?