Applied Optics, Optoelectronics, Optical Devices Physical optics 23 Engineering 12 Physics 11 Engineering, general 7 Laser Technology and Physics, Photonics 5 Laser physics 5 more ... Material Science 4 Materials 4 Microwaves 4 Microwaves, RF and Optical Engineering 4 Particles (Nuclear physics) 4 Solid State Physics and Spectroscopy 4 Computer science 3 Optical Spectroscopy, Ultrafast Optics 3 Optical and Electronic Materials 3 Optical materials 3 Spectrum analysis 3 Surfaces (Physics) 3 Surfaces and Interfaces, Thin Films 3 Circuits and Systems 2 Communications Engineering, Networks 2 Electromagnetism 2 Electromagnetism, Optics and Lasers 2 Electronics 2 Electronics and Microelectronics, Instrumentation 2 Medicine 2 Nanotechnology 2 Plasma (Ionized gases) 2 Systems engineering 2 less ...