The 2033 Large Diameter Germanium Optical Receiver allows you to tweak your experiment without worrying about the beam wandering off the detector. Just position the 5.0 mm diameter, 800 to 1750 nm Germanium detector close to where you think the laser beam is and you'll see a signal. No more time-consuming and tedious photoreceiver alignment procedures. This free-space optical receiver has a 8-32 mounting thread and includes an M4 metric adaptor and tool.