The optical interface board is not open source ... And, if you’d like to learn more about optically coupled power meter interfaces, here’s a different open source project we’ve covered ...
Design and manufacture Broadband Pyroelectric Detectors & Radiometers, Optical Power Meters, Laser Joulemeters, Optical & Thermal TRAP Detectors & THz sensors. Products used to measure from pW-W, fJ-J ...