Aha! You got a point there. Looking over yours, it makes perfect sense. Why would it reflect through the YAG if the mirror is transparent to 532nm... Derp.Q-switch would definitely still be useful. Can't comment on the mirrors because I don't know the specs on them. Depends on what sort of cavity you want too. There's a couple of folk on here with experience in building/repairing high power YAG lasers, they'd be able to offer some tips.
FYI, your diagram has a small error.
It's not a whole lot cheaper, at least not if you're buying new parts. You'd still be looking at >$1000 to build a 3W 532nm unit from scratch using new parts. Probably >$2000. You can bring the price down considerably by buying used/surplus parts from places like eBay if you have some patience.
It's cheaper just to buy a unit from a supplier in China until you start getting into higher powers or you need really good specs, SLM, small beam diameter, good divergence, low M2, that sort of thing.
... I was wondering about that, imagining losses of the green in the crystal.
Well, there we go.
I would logically be able to keep the LAM as it would be doing the same job as it is currently, but the rest of the mirrors would have no use... I would need one other mirror that is partially transparent for the output... However at that point, dependant on cost, it makes sense to buy the 'LAM' mirror too, then I keep the whole Z-fold assembly whole in case I wish to go back to it again.
Ideally, for what I am interested in doing, I would like a nice and small spot size (as small as possible with said wavelength) and a nice, workable beam.
I hold interest in passing the beam through lenses and voice coils to distort the shape where needed. (an X and Y cylindrical aspheric lens)
The whole idea of buying that YAG unit was to save the money and time, then it's just two mirrors and a Q-Switch I already have. Though I dare say I'm oversimplifying it somewhat.
Hmm, Well, there is hardly the amount of data I'd imagine I should have... buuuutttt...
And some mounts that look quite suitable?