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6,181 terms
Photonics Dictionary
Clear All Filters x
TE x
cutoff wavelength
1. In detector technology, the long wavelength at which detector response falls to a set percentage (usually 20 or 50 percent). 2. In fiber optics, the shortest wavelength at which a fiber transmits...
cuton wavelength
In filter terminology, that wavelength where the filter transmission increases beyond 5 percent.
cutting
The process of forming a lens to a given pattern, or of cutting a piece of glass along the line of scratch.
CVF
continuously variable filter
CVROS
compact video-rate optical scanner
cyberspace
->
virtual reality
Virtual reality (VR) is a computer-generated simulation of a three-dimensional environment or experience that can be interacted with and explored by an individual using electronic devices, such as a...
cyclotron resonance
The tendency of charge carriers to spiral about an axis in a direction identical to that of an applied magnetic field that has an angular frequency formed by the value of the applied field and the...
cylindrical lens
A cylindrical lens is an optical component that has different curvatures along its two orthogonal axes, resulting in a shape resembling a cylinder. Unlike spherical lenses, which have the same...
Cz
Czochralski technique
Czerny-Turner design
A form of monochromator optical system consisting of two spherical concave mirrors used in conjunction with a movable diffraction grating.
D
density; diopter
D*
detectivity
D*
A value used to designate the relative sensitivity of a detector. The higher the D* value, the better the detector.
D-star
->
D*
A value used to designate the relative sensitivity of a detector. The higher the D* value, the better the detector.
DAC
digital-to-analog converter
Dammann grating
A Dammann grating is a type of diffractive optical element (DOE) used to create an array of equally spaced, uniform-intensity spots or beams. It is named after its inventor, Dr. Herbert Dammann. The...
damped least squares
An organizational method used in optical design computer programs. The technique produces one number (merit function) to measure the state of correction of an optical system. This number, which is...
daNm
dekaNewton meter
dark box
A lightproof box used for storing photosensitive materials.
dark current
The current that flows in a photodetector when there is no optical radiation incident on the detector and operating voltages are applied.
dark frame
A frame taken to identify electronic noise in a CCD imaging device. A dark frame is recorded without exposing the CCD to any external light by, for example, leaving the shutter of a CCD camera...
dark noise
The noise produced in a photodetector when the photocathode is shielded from all external optical radiation and operating voltages are applied.
dark signal
->
dark current
The current that flows in a photodetector when there is no optical radiation incident on the detector and operating voltages are applied.
dark-field condenser
A condenser that forms a hollow cone-shaped beam of light with its focal point in the plane of the specimen. If it is used with an objective having a numerical aperture lower than the minimum...
dark-field disc
A disc contained within an electronic cell counter for regulating light transmission.
dark-field microscopy
A technique whereby the sample is illuminated by a hollow cone of light larger than the acceptance angle of the objective, so that only scattered light is seen, revealing any irregularities of the...
dark-field photomicrography
A photomicrographic recording technique that utilizes dark-field illumination to render an image of an object having a refractive index much like that of the medium holding it. The object may be...
darkroom
A room that is light-tight, permitting total darkness or illumination with a safelight when working with photosensitive materials.
DARLI
digital angular readout by laser interferometry
DAS
differential absorption scattering; detector angular subtense; dual attachment station
data analysis display
An accurate cathode-ray tube display used to provide visual representation stored in a computer for the interpretation and evaluation of the data.
data bus
A system incorporated into fiber optic data communications characterized by several spatially distributed terminals that are served with the same multiplexed signal.
data compression
A method of storing digital data using techniques that consume less memory space than basic methods do. See differential pulse code modulation; run end coding; run length coding.
data cube
A multidimensional array of values that is commonly used in programming to describe a time series of image data. Each dimension in the data cube represents a new attribute, while the cells of the...
data link
The communications network between nodes of a data transmission system.
dBm
Decibels referenced to one milliwatt; often used to specify power ratings for semiconductor diode lasers.
DBR
distributed Bragg reflector
DCG
dichromated gelatin
DCS
data collection system; digital access and cross-connect systems; dual-cone scanner
DDS
doped deposited silica (Corning process)
de Broglie wavelength
The concept of the de Broglie wavelength exploits the wave-particle duality of quantum physics by associating all matter (of all sizes) with wavelike properties. The de Broglie wavelength states that...
Debot effect
The conversion of an internal latent image into a surface latent image through exposure to infrared radiation. The converse of the Herschel effect.
Debye-Scherrer-Hull method
->
x-ray analysis
The series of processes used to identify and evaluate crystal structure by using crystalline solids to diffract x-rays. In the Laue method, radiation of a wide range of wavelengths is transmitted by...
Debye-Sears ultrasonic cell
A device used in ultrasonic imaging to measure the velocity and attenuation of compressional waves in a transparent liquid by virtue of acoustic waves set up in the liquid. The wavefronts serve as a...
decentration
In a single element, any lack of coincidence between the optical and the mechanical axes. In a lens system, any lack of coincidence of optical axes of the lens elements that make up that system.
decentration aberration
An aberration occurring in a lens system when one or more of the centers of curvature of the optical surfaces do not coincide with the system's axis.
deci
Sl prefix meaning one tenth, 10-1.
decision-tree classification
A structural method of optical character recognition, used where the input media are variable, as in hand-written or multifont documents. A series of questions (such as "Does the character contain a...
deep
A concave surface that has too much negative power; i.e., its radius of curvature is too short. This condition can be corrected if material is removed from the center section of the polisher.
deep learning
Deep learning is a subset of machine learning that involves the use of artificial neural networks to model and solve complex problems. The term "deep" in deep learning refers to the use of deep...
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Photonics Dictionary
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