Photonics Dictionary: G

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Galilean telescope

A refracting telescope that yields an erect image by the use of a positive lens for its objective and a negative lens for its eyepiece.

gap loss

The optical power loss caused by a space between axially aligned fibers.

Gauss lens

A telescope objective with excellent spherochromatic correction, consisting of a meniscus crown and a meniscus flint, both convex to the long conjugate.

Gaussian profile

An intensity distribution (intensity as a function of radial distance from the beam center) which is given by the Gaussian function: where: I0 is the intensity at the beam center r is the radial...

georectification

The superposition of satellite or aerial images with a map in order to process and remove distortion. Uses reference points from map to align and apply information.

geosynchronous satellite

A man-made satellite that orbits 35,680 km from the Earth at a rate of one orbit per 24-hour period, thereby retaining its initial relative alignment with the Earth.

grating spectrograph -> spectrograph

An optical instrument for forming the spectrum of a light source and recording it on a film. The dispersing medium may be a prism or a diffraction grating. A concave grating requires no other means...

grating spectroscope

A spectroscope having a diffraction grating for the resolution of light of various wavelengths.

Gregorian telescope

A telescope with an ellipsoidal secondary concave mirror that reflects rays from a parabolic primary mirror through an opening in the center of the primary, where the image is viewed with an eyepiece.

gun camera

A camera accurately aligned to a weapons system to provide a photographic record of system performance.

gunsight

An optical device that permits the alignment of a gun, cannon or rocket launcher system with its target.

Photonics DictionaryG

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