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Photonics Dictionary: J
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Jamin refractometer
An instrument designed to measure the index of refraction of a gas by the interference patterns formed by two beams, one of which passes through a vacuum tube in which the gas is slowly released.
jig
A device to hold and locate a workpiece as it guides, controls or limits a cutting tool.
Josephson effect
Characteristic of radiation detectors that produce energy that is similar to the energy of superconductive gaps when interacting with photons.
Joule-Thomson cooler
A detector cooling device in which a gas under high pressure escapes through an expansion valve in the tank; as the escaped gas liquefies, it cools the site of the sensor.
Judas optics
A small defocused Galilean telescope mounted in a hole in a door. Viewed from inside through the positive lens, a wide-angle view of the outside is seen; viewed from outside through the negative...
Photonics Dictionary
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