Related by context. Frequent words. (Click for all words.) 65 photometry 65 interferometric 63 plasmon 63 elemental composition 62 stimulated emission 62 anisotropy 62 photoluminescence 61 isotropic 61 frequency comb 61 luminous flux 61 adiabatic 60 interferometry 60 absorbance 60 interferometers 59 photometer 59 kelvin 59 synchrotron radiation 59 colorimetric 59 ionisation 59 ellipsoid 59 phonon 59 spinel 59 dispersive 58 Hawking radiation 58 metallicity 58 emissivity 58 toroidal 58 keV 58 nonlinearity 58 diffraction pattern 58 maser 58 boson 58 tropospheric 58 z = 58 superlens 58 quantized 58 redshift 57 geoid 57 near infrared NIR 57 Cepheids 57 photonic crystal 57 InGaN 57 photometric 57 photosphere 57 irradiance 57 noctilucent clouds 57 perovskite 57 reflectance 57 thermally stable 57 interferometer 57 noble gases 57 photoelectric effect 57 cuprates 57 rubidium 56 gravitational lens 56 infrared wavelength 56 fused silica 56 electron density 56 decoherence 56 X ray emission 56 emissive 56 ultraviolet wavelengths 56 shorter wavelengths 56 attosecond 56 photodetector 56 x ray diffraction 56 gravitational wave 56 spectroscopic 56 solar corona 56 infrared spectroscopy 56 sorption 56 haloes 55 quadratic 55 isotopic 55 Tunable 55 ionised 55 dopant 55 ionization 55 stable isotope 55 DUV 55 Cosmologists 55 Raman spectroscopy 55 γ 55 confocal 55 gravitational lensing 55 isotopic composition 55 tetrahedral 55 elementary particle physics 55 spectrographs 55 diffractive 55 cm -1 55 exciton 55 solar irradiance 55 excitations 55 parameterization 55 cosmic microwave background 55 Gaussian 55 Bose Einstein condensate 54 planetary nebulae 54 aragonite 54 #um [002]