Again, too late to edit, but there's some interesting related content here: https://hackaday.io/project/5283-potpourri/log/21475-laser-internferometry-discussi

Again, too late to edit, but there's some interesting related content here: https://hackaday.io/project/5283-potpourri/log/21475-laser-internferometry-discussion https://hackaday.io/project/5283-potpourri/log/21475-laser-i... https://hackaday.com/2015/07/24/self-built-interferometer-measures-nanometer-displacement/ https://hackaday.com/2015/07/24/self-built-interferometer-me...