Combining 3 or more red lasers?

[Things]

Hey guys, as some of you say from mypost in the lounge, I have ordered 3(Just bought another one, make that 4 ) little 650nm diode modules. Now I would like to combine them, but have no idea about polarization etc. As far as I can remember, you can only use one PBS cube?

So how do you go about combining more than 2 lasers?

Cheers,
Dan

[dar303]

You make the beams sit just over eachother using mirrors, search for "knife edge mirror" on theis forum to learn more.

[mccarrot]

But when you stack the lasers into a square (no PBS required) you need to have thin beams to start with. To get thin beams you need to replace the standard lens with a 1 optic lens like LENS27, these are about 50USD each.

Then you can use SBK's setup to stack the beams together with mirrors.

[shrad]

you could also stack them like they are, and use a telescope to shrink the beam, if your original divergence is small enough

[mccarrot]

And what does a good telescope cost?

With a quality lens you also win 25% extra power for each diode