Photonics Dictionary Definitions, Abbreviations, Illustrations, Terms listing by the letter N (Items 1 thru 40)

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Photonics Dictionary Return to Dictionary home There are 122 terms that begin with 'N' Currently displaying records 1 thru 40. You are in set 1 of 3 next set —> or select a set: 1 N, n A symbol used to represent the refractive index. It is... 2 nadir In a remote sensing system, nadir refers to the point on... 3 Nagel anomaloscope See color perception test... 4 nano (n) An SI prefix meaning one billionth (10-9). Nano can also be... 5 nanometer (nm) A unit of length in the metric system equal to 10-9 meters.... 6 nanophotonics The study of how light interacts with nanoscale objects and... 7 nanopositioning actuator A positioning device capable of producing repeatable motion... 8 nanotechnology The use of atoms, molecules and molecular-scale structures... 9 narcissus A defect in infrared systems that appears as a dark... 10 narrow bandpass filter See interference... 11 narrow-angle dark-field illumination An imaging system designed to highlight small deviations in... 12 narrowband pyrometer An optical pyrometer that is equipped with a narrow... 13 National Television Systems Committee (NTSC) The code used to describe the United States system of color... 14 native fluorescence The light emitted from tissues without the use of... 15 Nd:glass See neodymium... 16 Nd:YAG See... 17 near point of eye The closest distance to which the eye can focus, normally... 18 nearest neighbor (NN) A resampling method that uses the value of the nearest... 19 near-field diffraction See Fresnel... 20 near-field holography A lithography method that allows the transfer of fine-pitch... 21 near-field region The area closest to an aperture or source where the... 22 near-field scanning Technique for measuring the index profile of an optical... 23 near-field scanning optical microscope (NSOM) A scanning probe microscope that analyzes the surface of a... 24 near-field walk In a laser diode, lateral motion of the beam center at the... 25 near-infrared (NIR) The shortest wavelengths of the infrared region, nominally... 26 near-ultraviolet The longest wavelengths of the ultraviolet region,... 27 near-ultraviolet light source A light source, such as the sun or an incandescent lamp,... 28 negative absorption Amplification; the result of the excess of stimulated... 29 negative carrier The structure that holds the photographic negative flat and... 30 negative crystal A uniaxial, birefringent crystal in which the velocity of... 31 negative dielectric anisotropy State in which the dielectric coefficient parallel to the... 32 negative ghost A ghost image that has the reverse lightness relations of... 33 negative glow In a cold-cathode tube, the luminance between the cathode... 34 negative lens See diverging... 35 negative meniscus lens See divergent-meniscus... 36 negative stereoscopic image When a stereo pair of images is switched so that the right... 37 negative temperature See population... 38 negative-electron-affinity (NEA) photocathode A photocathode having a P-type semiconductor with a work... 39 negative-refraction metamaterial A material in which light or other electromagnetic... 40 negatron A negatively charged elementary particle. See... Currently displaying records 1 thru 40. You are in set 1 of 3 next set —> or select a set: Return to Dictionary home Click to view listings of terms Term of the moment... adaptive optics - Optical components or assemblies whose performance is monitored and controlled so as to compensate for aberrations, static or dynamic perturbations such as thermal, mechanical and acoustical disturbances, or to adapt to changing conditions, needs or missions. The most familiar example is the "rubber mirror,'' whose surface shape, and thus reflective qualities, can be controlled by electromechanical means. See also active optics; phase conjugation.	advertisement advertisement advertisement advertisement advertisement advertisement advertisement

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