246 terms
Photonics Dictionary: O
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opticsOptics is the branch of physics that studies the behavior and properties of light, including its interactions with matter and its manifestation as both particle and wave phenomena. It encompasses the...
optics of materialThe area of optics that deals with the interaction of light with a given material. The optical properties of material are generally described by the absorption, transmission, reflection, and...
optical fiberOptical fiber is a thin, flexible, transparent strand or filament made of glass or plastic used for transmitting light signals over long distances with minimal loss of signal quality. It serves as a...
optical wireless -> free-space opticsFree-space optics (FSO), also known as optical wireless communication or optical wireless networking, refers to the transmission of data using modulated beams of light through free space (air or a...
OAoptical axis
OADMoptical add-drop module
OALMoptical address light modulator
OAMPoptical-analog matrix processing
objectThe figure seen through or imaged by an optical system. It may contain structures, natural or artificial, or it may be the real or virtual image of an object formed by another optical system. In...
object conjugate -> object distanceThe distance between the object and the cornea, or the first surface of the objective in an optical device.
object distanceThe distance between the object and the cornea, or the first surface of the objective in an optical device.
object spaceIn an optical system, the space between the object being viewed and the system entrance pupil.
objectiveThe optical element that receives light from the object and forms the first or primary image in telescopes and microscopes. In cameras, the image produced by the objective is the final image. In...
objective aperture -> clear apertureThe limited light-gathering area of an optical system. The area is normally restricted to an edge or outer surface of an individual component. Also known as free aperture or objective aperture. The...
oblique illuminationA common technique in microscopy, oblique illumination is one in which the object is illuminated by a light source that is at an oblique angle (on the side) to the optical axis. This technique is...
OCoptical computing
OCCRoptical Chinese character recognition
OCDRoptical coherence domain reflectometer
OCDUoptics coupling display unit
OCMoptical countermeasure
OCOoptically coupled oscillator
OCRoptical character recognition; optical character reader
OCToptical coherence tomography
octaveIn optics, an octave typically refers to a range of frequencies or wavelengths that spans a factor of 2. In other words, when dealing with optics, an octave encompasses a doubling of frequency or...
ocular -> eyepieceAlso known as ocular. The lens system used between the final real image in a visual optical system and eye. It acts as an image magnifier. Many types of eyepieces are known; e.g., the Huygens used in...
oculometerAn electro-optical infrared tracker consisting of a beamsplitter, an illuminating source, an image dissector tube and an electronics unit, that automatically acquires and tracks particular eye...
OCVoptical character verification
OCWRoptical continuous wave reflectometer
ODoptical density; outside diameter
ODMoptical disc memory
ODNoptical distribution network
ODPoptical data processing
ODSoptical data storage
OESoptical emission spectroscopy
OFDRoptical frequency domain reflectometer
off-axis paraboloid and ellipsoid mirrorOff-axis paraboloid and ellipsoid mirrors are specialized optical components used in various optical systems, particularly in applications requiring precise focusing, collimation, or imaging of...
off-axis paraboloidal mirror -> paraboloidal mirrorA concave mirror that has the form of a paraboloid of revolution. The paraboloidal mirror may have only a portion of a paraboloidal surface through which the axis does not pass, and is known as an...
offset prismA prism or prism assembly that serves to displace the instrument's optical axis.
OFToptical fiber thermometry
OIGoptically isolated gate
OISLoptical intersatellite link
OLToptical lay-up template; optical line terminator
OLTSoptical loss test set
OMoptical master
OMAoptical multichannel analyzer
OMDoptical modulation depth
OMRoptical mark reader
OMUoptical measuring unit
ONIoptical network interface
ONNoptical neural network
Photonics DictionaryO