Photonics Dictionary: G

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Gaussian beam optics

The area of optics that deals with the propagation of Gaussian laser beams in free space, or any general medium - i.e. lenses- under the paraxial (small divergence angle) approximations. Gaussian...

Gaussian optics

1. That branch of optics that illustrates the theory in which q is substituted for sin q in Snell's law. Effective results are achieved if the aperture and field angle are made very small. The...

geometric extent -> etendue

A product of the area of a light beam (normal to its direction of propagation) and the solid angle that the beam includes; flux per unit radiance or luminance. Alternative terms: geometric extent,...

Golgi Staining Technique

The Golgi staining technique (also called the black reaction) makes it possible to look at the nervous system by rendering neurons visible under light microscopy. After a long process involving...

goniometer

A spectrometer or autocollimator used to measure prism angles.

goniometer eyepiece

An eyepiece having a rotating index or cross wire linked to an external 360° scale to allow measuring of angles in an image.

goniophotometer

A device used to measure directional reflectance, with light collection restricted to a narrow range of angles of which the central angle varies.

goniophotometric curve

The graphed curve illustrating the directional reflectance of a sample for different angles of collection.

grating beamsplitter

A grating beamsplitter is an optical device that utilizes the principles of diffraction to split a beam of light into multiple beams, often redirecting them at specific angles. It is based on the...

grating prism

A specific, right-angle prism having a transmission grating replicated on its hypotenuse face and used in applications requiring a system that can produce in-line viewing for one wavelength.

grazing incidence

Light striking a surface at an angle almost perpendicular to the normal.

ground glass

A plate of glass in which a face has been frosted by grinding or etching. It diffuses light by scattering in directions close to the incoming beam, but the light falls off rapidly at larger angles...

gyroscopic camera mount

A mount that uses a floating suspension and a motor-driven gyroscope to keep a motion picture or still camera at a set angle even though the camera is mounted in a place that subjects it to heavy...

Photonics DictionaryG

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