I was wondering ... if someone try to build [ maybe me ] rgb laser projector from fat beams lasers ? Is it technically possible ?
Yes it's possible. You may need to use larger scanner mirrors though which will either reduce your scan speed or reduce your scan angle if you keep the same speed. It's that or you use smaller mirrors and have a bunch of the beam miss the mirrors.
It depends a bit how 'fat' you actually mean.
If it's something like 3 to 5 mm diameter beams it's feasible though the 'standard' galvo and mirror kits will have some loss due to missing the mirror especially in the corners of the projection area.
Larger mirrors would be the obvious solution, though i think it would be best to get galvo's that are intended to use with those. Just replacing the mirrors on existing galvo's with bigger ones could cause problems as they are not designed for the extra inertia and even a compensation pot on them could not provide enough range.
Well...you could use Flat/Fat beams....but why ??? Just throw some Cylindrical Lenses in front of yer beam....and....Wah Lah !!! Nice tight beams.
The methods are well reviewed, here and at PL...Just purchase some 6X lenses from Laser Show Parts....and experiment !!!....I think...IIRC....about $ 50 USD a set !!
....you will have to message Dave and ask him because....I do not think they are listed on the store.
I mean...really...If you have the drive to build your own projector....a very doable thing....go the extra distance....and get yourself some decent beams.
But....everyone has both a * ....and an opinion !!
I personally don't know how well fat beams will work. Between the small mirror surface area, and the very limited movement of the galvos, I'd think it'd just end up looking more like a blur on the wall rather then an actual pattern.