Laser communication systems Fiber optics 2 Optical communications 2 Atmosphere 1 Heterodyning (Electronics) 1 Heterodyninterferometrie 1 Heterodynspektroskopie 1 Interference (Light) 1 Laser 1 Laser interferometry 1 Laser spectroscopy 1 Lasers 1 Laserspektroskopie 1 Nonlinear optics 1 Optical detectors 1 Optical radar 1 Optical radar--elastic lidar 1 Optoelectronic devices 1 Semiconductors 1