Related by context. Frequent words. (Click for all words.) 69 visible wavelengths 66 shorter wavelengths 65 emissivity 64 infrared wavelengths 62 photometry 62 absorbance 61 keV 60 magnifications 60 photometer 60 ultraviolet UV 60 reflectance 60 solar corona 59 X ray emission 59 redshifts 59 spectra 59 irradiance 59 microwave frequencies 58 fluorophores 58 transmittance 58 isotropic 58 -# ° C [001] 58 photodiodes 58 wavelengths 58 photodiode 58 interferometry 57 InGaAs 57 spectrographs 57 infrared 57 Gamma rays 57 infrared radiation 57 Tunable 57 spectrally 57 unaided eye 57 ultraviolet 57 pulsed laser 56 CCD camera 56 photodetector 56 multispectral 56 anisotropy 56 spectroscopic 56 emissive 56 ultraviolet UV light 56 electron density 56 diffraction 56 optical microscopes 56 Crab Nebula 56 infrared rays 56 TFTs 55 transmissive 55 transmission electron microscopy 55 NICMOS 55 MeV 55 shorter wavelength 55 SWIR 55 ionisation 55 photoresists 55 diffractive 55 -# degrees Fahrenheit [002] 55 VCSELs 55 WFC3 55 polarizers 55 phosphors 55 optical microscopy 55 luminosity 54 radiometer 54 atmospheric turbulence 54 chromatic aberration 54 UVB radiation 54 supernova remnant 54 photonic crystal 54 Fluorescence 54 reflectivity 54 electron beams 54 CCD sensors 54 photodetectors 54 cryogenic temperatures 54 RGB LED 54 nm wavelength 54 SiO 2 54 refractive index 54 parallax 54 wavelength 54 #μm [002] 54 frequency comb 53 XMM Newton 53 photonic crystals 53 ionized gas 53 phosphorescence 53 temperature coefficient 53 active galactic nuclei 53 ionised 53 ionize 53 F#.# [001] 53 Imaging Spectroradiometer MODIS 53 f#.# 53 vignetting 53 brightness 53 astronomical objects 53 redshift 53 star Gliese 53 silicon nitride