I am impressed and humbled. Has anyone else built an interferometer in their garage? The phototube measurement is great, but please see also: https://m.youtube.com/watch?v=uphPKYR2i5M Per my knowledge, The only other reference close to this level of quality is David Prutchi: http://www.prutchi.com/quantum-physics/ The Hardware Hackers Won! Cheers, —Brad