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

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Photonics Dictionary Return to Dictionary home There are 187 terms that begin with 'H' Currently displaying records 1 thru 40. You are in set 1 of 5 next set —> or select a set: 1 hackle A defect in the cleaved end face of an optical fiber,... 2 Haidinger fringes Also known as constant angle or constant deviation fringes.... 3 hair-trigger operation Triggering a laser at a predetermined time by pumping it to... 4 halation 1. In a cathode-ray tube, the glow surrounding a bright... 5 half bandwidth (HBW) Full width of the bandpass at half-power or half of peak... 6 half duplex (HD) A communications system that can transmit in only a single... 7 half silvered Describing a surface that is coated with a film of metal of... 8 half wave Refers to half a wave... 9 half-power point (HPP) 1. The value on either the leading or the trailing edge of... 10 half-shade device A device for forming at least two adjacent areas of... 11 half-shade plate A semicircular, half-wave quartz plate between the... 12 halftone screen A plate containing a uniform pattern of transparent holes... 13 halftones The gray-colored tones halfway between shadows and... 14 half-wave plate A plate of electro-optical material that serves to rotate... 15 half-wave voltage That voltage required across a Pockels, Kerr or other... 16 halide An MX-type compound of which fluorine, chlorine, iodine,... 17 Hall effect The development of a transverse electric field in a solid... 18 halo 1. The faintly hued ring that is seen to surround a light... 19 halogen Any of the five elements astatine, chlorine, fluorine,... 20 halving line The line that divides the two half-images in a coincidence... 21 hand viewer A device small enough to be held in a hand that uses a... 22 hard coating Usually a dielectric coating on glass or plastic optics; a... 23 hard copy Text or images printed on paper or another tangible medium,... 24 hard elastics High-modulus elastic fibers that exhibit the following... 25 hard seal The process of sealing laser components by means of frit... 26 hard tube See high-vacuum... 27 hard x-ray A type of x-ray that is capable of deep penetration; its... 28 hard-clad silica (HCS) fiber A type of optical fiber in which a silica core is... 29 hardness In the most general sense, the resistance of a solid... 30 harmonic generation With relation to radiant energy, the conversion of... 31 harmonic wave analyzer An instrument designed to calculate the amplitude and phase... 32 Harting Dove prism A direct-vision prism made in one piece that can be used... 33 Hartmann formula See dispersion... 34 Hartmann test A test for spherical aberration, coma or astigmatism in... 35 haze An aggravated form of fog in a polished surface caused by... 36 haze factor The ratio between the luminescence of an object and the... 37 haze filter A filter, used in photography, that absorbs the ultraviolet... 38 HE₁₁ mode Designation for the fundamental mode of an optical... 39 head-up display (HUD) An optical system that superimposes a synthetic display... 40 heat equation A calorimetric calculation from which the temperature vs.... Currently displaying records 1 thru 40. You are in set 1 of 5 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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