I'm trying to understand how to combine a square array of laser diodes of the same wavelength and polarisation into a single beam.
It seems like there are only two options (beam splitter cubes and dichroic mirrors), neither of which make sense here.
Question
Is it possible to use a telescope arrangement? This should condense the square image to a very small size.
I'm a hobbyist looking to build a cheap CW laser to pump a Ti:Sapphire, and so ultimately all the energy will need to be directed to a point of < 1mm.
