Tried this simple Michelson interferometer for measuring the error of a 100mm translation stage yesterday. The interferometer and stage are mounted to the same optical table, but there’s still a fair amount of vibration of the measurement corner-cube which causes instability in the signal when the stage is not moving. Some sample data here: interf_data. One [...]

There’s a seriously cool green laser on top of a Siemens building in Adlershof in Berlin.