“How do Laser Interferometers work?”
Laser Interferometers work as follows: A coherent laser beam will be emitted from a source. The beam will then hit a mirror at an angle to its wave of propagation, causing it to split into parts parallel and perpendicular to the original travel. These will be reflected by mirrors, and will head back to the original mirror where they will combine and interfere. This new wave will travel to a detector, where the interference pattern will be picked up and can be analyzed to measure small displacements.