Not to get this thread off topic, but can you point me to any threads on knife edging or explain it a bit? is it really as simple as I think? Just fine tuning a mirror to barely be on the edge of both beams? I assume that if you're going to have the option of putting it into a PBS into the future, you'd align the axises. So assume the alignment for one diode looks like an '|'. Would you stack two next to each other (like this " || ") or would you make it look like one long axis? (like this " -- ") and then correct in the prism? I'd think that if you were using a prism, you'd do the latter, but....