Interferometry 6 Optical measurements 3 Interferometers 2 Lasers 2 Astronomy-Radio astronomy 1 Diffraction patterns 1 Fiber optics 1 Heterodyning (Electronics) 1 Heterodyninterferometrie 1 Heterodynspektroskopie 1 Holographic interferometry 1 Imaging systems in geophysics 1 Interference (Light) 1 Laser 1 Laser communication systems 1 Laser interferometry 1 Laser spectroscopy 1 Laserspektroskopie 1 Optical radar 1 Optical wave guides 1 Optics--lens--camera--microscope--diffraction--coherence--interferometry--holography--optical resonators--second harmonic generation--optical waveguides--attenuation--fiber bandwidth--integrated optics 1 Polarimetric remote sensing,Electromagnetic waves--Scattering,InterferometryRadio waves--Polarization,, 1 Polarimetry 1 Radio interferometry 1 Space Astrometry 1 Space interferometry 1 Speckle metrology 1 Subsidences (Earth movements) 1