I would suggest the collimator from Mccarrot. I have seen it in real live with a prism pair in front of it and the result was close to a 1mrad beam.
http://www.photonlexicon.com/forums/...ighlight=prism
a few months we had to spend a small fortune on a 1 watt blue 445. I find it amazing that when it comes spending some money on good optics nowadays members are still using lenses like the aixiz.

If you want the best quality beam with good divergence you have the spend a little money on good optics. Start with buying a good collimator and a good set of prism and the result will be a top quality beam.
