Beam Splitter for 12mm AixiZ Module

I've begun building my own laser drivers and am interested in experimenting with automatic power control (APC).

I'm curious if anyone knows where I might be able to purchase a beam splitter that can be used inline with 12mm AixiZ type modules. For reference, I am thinking something similar to this:





It is not essential that the photodiode be included, but a 45° beam splitter mountable before the lens in a 12mm module that allows a small portion of the light from a 520nm laser diode to be redirected for power detection would be perfect.

Use a simple pane of glass and mount it 45 degrees however you see fit. Glass will reflect something around 5-10% of the light.

^^ good idea--