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Photonics Dictionary: O

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OES
optical emission spectroscopy
OFD
open-face detector
OFDR
optical frequency domain reflectometer
off-axis paraboloid and ellipsoid mirror
Off-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 mirror
A 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 prism
A prism or prism assembly that serves to displace the instrument's optical axis.
OFT
optical fiber thermometry
OH
hydroxyl ion
ohm
The electrical resistance between two points of a conductor when a constant difference of potential of one volt, applied between these points, produces in this conductor a current of one ampere, the...
OIDA
Optoelectronics Industry Development Association (USA)
OIG
optically isolated gate
oil-immersion objective
A form of high-power microscope objective where the space between the object and the first element is filled with an oil having the same index as that element. This form reduces losses, increases the...
oil-on plate
A polished plano-parallel plate that is contacted to an unpolished glass surface to permit see-through analysis of the material. The plate eliminates effects because of the surface quality of the...
OISL
optical intersatellite link
OITDA
Optoelectronic Industry & Technology Development Association (Japan)
OJRL
Optoelectronics Joint Research Laboratory (Japan)
OLBR
operational laser beam recorder
OLCR
online character recognition
OLED
organic light-emitting diode
oleophobic
Oleophobic is a term used to describe substances or materials that repel or resist oils. The word oleophobic comes from the Greek words "oleo," meaning oil, and "phobos," meaning fear. Oleophobic...
OLT
optical lay-up template; optical line terminator
OLTS
optical loss test set
OM
optical master
OMA
optical multichannel analyzer
OMAS
optoelectronic mular assembly system
OMD
optical modulation depth
OMR
optical mark reader
OMU
optical measuring unit
OMVPE
organometallic vapor phase epitaxy
ondoscope
A glow discharge tube placed on an insulating rod to detect the presence of high-frequency radiation in the vicinity of a transmitter. The tube indicates the presence of the radiation by the glow...
ONI
optical network interface
ONN
optical neural network
ONR
Office of Naval Research
ONU
optical network unit
OOI
open optical interface
OOK
on/off keying
OPA
optoelectronic pulse amplifier
opacimeter
An instrument for measuring opacity.
opacity
Opacity refers to the degree to which something is not transparent or translucent, meaning that it doesn't allow light to pass through it easily. It's a measure of how much a material obstructs the...
OPADEC
optical particle decoy
OPAL
optical access line
opal glass
A material consisting of very small colorless particles imbedded in a clear glass matrix. It is available in two forms: flashed opal and pot opal. The flashed variety consists of a rather thin layer...
opal lamp
A tungsten filament lamp that uses an opal glass bulb to diffuse light.
opaque
A term describing a substance that is impervious to light; the characteristic of a substance that has no luminous transmittance.
opaque projector
An opaque projector is a device used for enlarging and projecting images from opaque objects such as printed pages, photographs, or three-dimensional objects onto a screen or surface. Unlike a...
OPC
optical phase conjugation
OPD
optical path difference
OPDAR
optical detection and ranging
open bubble
A bubble at a polished surface that has been opened by grinding or polishing.
open optical interface
An interface in an optical network that permits an optical signal to pass without changing the optical signal to an electrical signal and therefore does not limit the signal to a specific protocol.

Photonics DictionaryO

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