Related by context. Frequent words. (Click for all words.) 73 laser 72 laser beams 65 lasers 56 infrared 52 gamma rays 51 ultraviolet light 51 electron beam 51 photons 50 wavelength 50 diffraction 49 photon 49 infra red 48 wavelengths 48 tracer 48 magnetic fields 47 gamma ray 47 beam 47 fluorescence 46 spectrometer 46 electromagnetic waves 45 quantum dot 45 detector 45 electron 45 electromagnetic 45 projectile 45 X ray 44 rays 44 UV light 44 optic 44 quantum dots 44 ultraviolet 44 ionosphere 44 infrared camera 44 waveguide 44 optically 44 tracers 44 cosmic rays 43 arrow 43 electrode 43 comet 43 pulsed 43 refraction 43 aperture 42 strobe light 42 particle 42 electrons 42 searchlight 42 neutron 42 reflector 42 electrical currents 41 strobe 41 neutrons 41 spectrometers 41 beams 41 excitation 41 filament 41 electrodes 41 nanotube 41 nanowire 41 particles 41 protons 41 imager 41 x ray 40 wand 40 magnetically 40 reflectivity 40 searchlights 40 nanoparticle 40 Lasers 40 illumination 40 fluorescent 40 spectroscopy 40 spectral 40 luminescence 40 quasar 40 ionization 40 Infrared 40 emitted 40 retina 39 sensor 39 molecule 39 brightness 39 tunable 39 solar flares 39 laser diode 39 ions 39 nanocrystals 39 orb 39 telescope 39 spectra 39 ultrasonic 38 optics 38 carbon nanotube 38 millimeter wave 38 droplet 38 sun rays 38 prisms 38 nozzle 38 proton 38 sunlight 38 magnetic