I was looking at pyrostyro's videos on Youtube, and he showed a beam combiner based on an X-Cube.
https://www.youtube.com/watch?v=yy-vAc6hPig
(For someone from LPF, he is amazing! Well worth checking out, IMHO).
I had not seen this before; why not?
Is there some horrible lack of transmission mojo or something?
Cubes are super cheap on eBay.
Anybody worked with these?
Thanks...Mike