Just ordered some of the hot M-140 diodes from DTR to test with. I'll put a pair of them (knife-edged) into each face (4 diodes total) and see what happens. Gonna need a brick for a backstop though - should be north of 7 watts out the front end if I'm lucky...
Pics to follow once I get all the parts delivered and assembled. (Now I wish I had that waveplate.... Would make this a lot easier!)
Adam