LASER INTERFEROMETER INTRODUCTION: Interferometry is a family of techniques in which waves, usually electromagnetic waves , are superimposed causing the phenomenon of interference in order to extract information. [1] Interferometry is an important investigative technique in the fields of astronomy , fiber optics , engineering metrology , optical metrology, oceanography , seismology , spectroscopy (and its applications to chemistry ), quantum mechanics , nuclear and particle physics , plasma physics , remote sensing , biomolecular interactions , surface profiling, microfluidics , mechanical stress/strain measurement, velocimetry, and optometry . [2] :1–2 Interferometers are widely used in science and industry for the measurement of small displacements, refractive index ...