Author:
Esteban-Martín Adolfo,Esteve-Taboada José J.,Silva Fernando,Roldán Eugenio,García-Monreal Javier,de Valcárcel Germán J.
Abstract
Optical interferometry provides the most accurate spatial measurements. Here, we demonstrate, experimentally and theoretically, a massive improvement over existing techniques using nonlinear photorefractive wave-mixing and tabletop Mach-Zehnder interferometers, allowing displacement measurements with sub-nanometer accuracy.