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8,726 terms

Photonics Dictionary

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.

open-dish method

A 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...

opening

In morphological image processing, a series of erosions followed by the same number of dilations.

ophthalmic

Pertaining to the human eye.

ophthalmic instruments

A 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;...

ophthalmic photography

The methods and techniques used to obtain medical photographs of the human eye. To photograph the exterior of the eye, conventional still photographic equipment and procedures are used. Similarly, in...

ophthalmology

Ophthalmology is a branch of medicine that focuses on the anatomy, physiology, and diseases of the eyes and visual system. Ophthalmologists are medical doctors who specialize in the diagnosis,...

ophthalmometer

See eye test apparatus; ophthalmic instruments.

ophthalmoscope

Also referred to as a funduscope, an ophthalmoscope is a specialized instrument used by ophthalmologists for observing and photographing the fundus (interior) of the eye which includes the retina,...

ophthalmoscopy

Also referred to as fundus photography, ophthalmoscopy is the dioptrical study of the various interior components of the eye such as the macula, fovea, and opticdisk, and is overall essential in...

OPM

optical performance monitor

OPO

optical parametric oscillator

opposition effect

Also referred to as the opposition surge, the opposition effect is a photometric phenomenon in which a rough retroreflective surface appears brighter when illuminated from directly behind the...

OPR

optical page reader; optical pattern recognition

OPS

optical power spectrum

optic lobe

The optic lobe refers to a specific part of the brain found in vertebrates and some invertebrates, particularly in the visual systems of these organisms. In vertebrates, including humans, the optic...

optical

Pertaining to optics and the phenomena of light.

optical aberration -> optical aberration

Optical aberration refers to imperfections or deviations from ideal optical behavior in an imaging system, such as a lens or a mirror. These aberrations can cause distortions, blurring, or other...

optical aberration

Optical aberration refers to imperfections or deviations from ideal optical behavior in an imaging system, such as a lens or a mirror. These aberrations can cause distortions, blurring, or other...

optical accumulator

An optical accumulator is a concept or device that collects and stores optical energy or data for subsequent use. This can be applied in various fields within optics and photonics: Optical data...

optical activity

The capacity of a chiral substance such as a crystal or molecule to rotate the plane of polarized light that is transmitted through it. Any substance that cannot be superimposed onto it's mirror...

optical air mass

A measure of the optical path length for light traveling from the sun or other celestial source through Earth's atmosphere to sea-level relative to the optical path length traveled by light from the...

optical analysis

The mathematical evaluation of an optical system to determine and quantify its basic optical properties and image quality characteristics.

optical artifacts

Optical artifacts refer to undesired or unintended effects that can occur in optical systems, such as microscopes, cameras, telescopes, and other optical instruments. These artifacts can distort or...

optical assembly

An optical assembly refers to a collection of optical components that are carefully arranged and aligned to perform a specific function within an optical system. These components may include lenses,...

optical autocorrelator

An instrument used to test lenses by utilizing the optical transfer function. It consists of a HeNe laser, a beamsplitter and two mirrors.

optical axis

The imaginary line passing through both the centers of curvatures of the optical surfaces of a lens or mirror; the optical centerline for all the centers of an optical element(s) of an optical...

optical barcode reader

An optical barcode reader, commonly known as a barcode scanner, is a device that uses optical technology to capture and interpret data encoded in barcode symbols. Barcodes are typically printed on...

optical beam steering

Directing an optical beam in varying directions by varying reflection, refraction, focusing and diffraction methods.

optical bench

A support for optical parts comprising a solid bed that permits precise longitudinal movement of one component relative to the others, and a number of sliders equipped with holders for lenses, lamps,...

optical bistability

The phenomenon that can render an optical resonator the equivalent of a semiconductor flip-flop. A bistable device will remain stable in two optical states, one of high transmission and another of...

optical blacking

A light absorbing material applied to ground optical surfaces during the process of making that surface non reflective. Such material should have a refractive index as high as that of the underlying...

optical blank

A casting consisting of an optical material molded into the desired geometry for grinding, polishing or, in the case of optical waveguides, drawing to the final optical-mechanical specifications.

optical bottle

A term referring to an optical force field used to trap and stabilize particles acted upon by a force such as laser light.

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Photonics Dictionary

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