I am tasked with a fairly long distance laser projection, and need to get divergence low as possible in the far field (say 500 meters distance).
I remember someone talking about a lens system placed directly AFTER scanners, which reduces divergence at the expense of narrower scan angle. Could this just be a simple beam expander?
I know the scanned beam changes things significantly vs a static beam, and one would have to account for increased entrance and exit diameters, but is it theoretically possible if you can avoid "clipping" the edges of the beam expander? The actual scan angle would be really low, maybe 5 degrees so it would not be the typical 50 degree scan angle one usually sees in shows.
Forgive me if I am trying to break the laws of physics here, I am no optical knowledge. I just remembered this and it got me thinking. I worry that I may missing something fundamental but felt I had to ask.