8,617 terms
Photonics Dictionary
offset prismA prism or prism assembly that serves to displace the instrument's optical axis.
OFToptical fiber thermometry
OHhydroxyl ion
ohmThe 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...
OIDAOptoelectronics Industry Development Association (USA)
OIGoptically isolated gate
oil-immersion objectiveA 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 plateA 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...
OISLoptical intersatellite link
OITDAOptoelectronic Industry & Technology Development Association (Japan)
OJRLOptoelectronics Joint Research Laboratory (Japan)
OLBRoperational laser beam recorder
OLCRonline character recognition
OLEDorganic light-emitting diode
oleophobicOleophobic 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...
OLToptical lay-up template; optical line terminator
OLTSoptical loss test set
OMoptical master
OMAoptical multichannel analyzer
OMASoptoelectronic mular assembly system
OMDoptical modulation depth
OMRoptical mark reader
OMUoptical measuring unit
OMVPEorganometallic vapor phase epitaxy
on-board opticsOn-board optics refers to optical systems integrated into devices or platforms for various purposes, such as imaging, navigation, communication, and sensing. These systems are crucial in a wide range...
ondoscopeA 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...
ONIoptical network interface
ONNoptical neural network
ONROffice of Naval Research
ONUoptical network unit
OOIopen optical interface
OOKon/off keying
OPAoptoelectronic pulse amplifier
opacimeterAn instrument for measuring opacity.
opacityOpacity 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...
OPADECoptical particle decoy
OPALoptical access line
opal glassA 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 lampA tungsten filament lamp that uses an opal glass bulb to diffuse light.
opaqueA term describing a substance that is impervious to light; the characteristic of a substance that has no luminous transmittance.
opaque projectorAn 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...
OPCoptical phase conjugation
OPDoptical path difference
OPDARoptical detection and ranging
open bubbleA bubble at a polished surface that has been opened by grinding or polishing.
open optical interfaceAn 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.
open-dish methodA measurement method for reflectance by gas ionization in which light passes through a vapor before and after reflection. Detection is accomplished with a phosphor-tipped lightpipe that leads to a...
openingIn morphological image processing, a series of erosions followed by the same number of dilations.
ophthalmicPertaining to the human eye.
ophthalmic instrumentsA family of specialized instruments used by ophthalmologists and optometrists to study a patient's eyes and prescribe spectacles. It includes the ophthalmoscope to observe and photograph the retina;...
Photonics Dictionary