Photonics Dictionary Definitions, Abbreviations, Illustrations, Terms listing by the letter J (Items 1 thru 18)

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Photonics Dictionary Return to Dictionary home There are 18 terms that begin with 'J' Currently displaying records 1 thru 18. You are in set 1 of 1 1 jacket The outer material that surrounds and protects the buffered... 2 Jacquinot advantage The higher throughput obtained with an FTIR device compared... 3 Jamin refractometer An instrument designed to measure the index of refraction... 4 Jansky noise Phrase applied to any noise of extraterrestrial origin,... 5 jellet prism A prism produced by severing a Nicol prism and... 6 jet-streamed dye laser A continuous-wave dye laser that uses a circulation pump... 7 jig A device to hold and locate a workpiece as it guides,... 8 jig allowance Also called coating jig allowance. That margin on an... 9 jig transit An optical instrument containing a gimballed sighting... 10 jitter 1. In relation to cathode-ray tube displays, errors in the... 11 Johansson geometry A design for bent crystal monochromators in which spacing... 12 Johnson's curve The graph of a curve describing the spectral irradiance of... 13 joint transform correlator (JTC) A device consisting of two optical systems in which two... 14 Josephson effect Characteristic of radiation detectors that produce energy... 15 joule (J) A unit of energy or work in the MKS system of units. One... 16 Joule-Thomson (J-T) cooler A detector cooling device in which a gas under high... 17 Judas optics A small defocused Galilean telescope mounted in a hole in a... 18 junction diode A semiconductor device with the property of conducting... Currently displaying records 1 thru 18. You are in set 1 of 1 Return to Dictionary home Click to view listings of terms Term of the moment... saturation - 1. The decrease of the absorption (or gain) coefficient of a medium near some transition frequency when the power of the incident radiation near that frequency exceeds a certain value. As long as the absorption (or gain) coefficient is constant, the power absorbed (or emitted) by the medium is proportional to the incident power. However, there is always a limit to the rate at which the medium can absorb (or emit) power that is determined by the lifetimes of the energy levels involved. As this limit is reached, the induced transitions become rapid enough to affect the energy level populations, making them more nearly equal. 2. With respect to color, attribute of a visual sensation that permits a judgment to be made of the proportion of pure chromatic (in contrast to achromatic) color in the total sensation. The psychosensorial correlate, or nearly so, of colorimetric purity. See also chroma; Munsell chroma.	advertisement advertisement advertisement advertisement advertisement advertisement advertisement

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