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9 terms
Photonics Dictionary: J
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jellet prism
A prism produced by severing a Nicol prism and reconstructing the polarization angles of the two halves so that they are slightly wedged toward each other.
jet-streamed dye laser
A continuous-wave dye laser that uses a circulation pump and nozzle to provide an optically flat stream of dye across the laser's optical axis.
jig
A device to hold and locate a workpiece as it guides, controls or limits a cutting tool.
jig allowance
Also called coating jig allowance. That margin on an optical component that is outside the clear aperture for use in holding the component in the optical thin-film coater tooling during the...
jig transit
An optical instrument containing a gimballed sighting telescope, used to measure angular relationships in horizontal and vertical planes.
Johansson geometry
A design for bent crystal monochromators in which spacing is constant along any circular arc terminating at the two foci and with equally spaced Bragg planes curved about only one axis.
joint transform correlator
A device consisting of two optical systems in which two signals are simultaneously transformed to produce their spectra, and these spectra are multiplied and inversely transformed to produce the...
Josephson effect
Characteristic of radiation detectors that produce energy that is similar to the energy of superconductive gaps when interacting with photons.
junction diode
A semiconductor device with the property of conducting current more easily in one direction than the other. It has two terminals containing a single crystal of semiconducting material that ranges...
Photonics Dictionary
J
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