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Opto Diode Corp. - Detector Spotlight 10-24 MR

Excelitas PCO GmbH - PCO.Edge 11-24 BIO HP

8,726 terms

Photonics Dictionary

DCS

data collection system; digital access and cross-connect systems; dual-cone scanner

DDS

doped deposited silica (Corning process)

display electronics

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...

DEA

display electronics assemblies

deblocking

The removal of optical elements from a block.

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 effect

The selective absorption of electromagnetic waves by a liquid made up of molecules with permanent dipole movement.

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...

decentering

1. The grinding or edging of a lens so that the geometrical center and optical center do not coincide. 2. The shifting of an optical element from the system's optical axis, sometimes done on purpose...

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.

decibel

The standard unit used to express gain or loss and relative power levels. The decibel (dB) = 10 log (P2/P1).

decimation

The process of reducing the size of an image by removing a certain proportion of the samples produced from the original image.

decision-theoretic character recognition

An approach to optical character recognition based on matching the input character against a set of stored prototypes.

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...

deep multiphoton microscopy

Deep multiphoton microscopy is an advanced imaging technique used in biological and biomedical research to visualize structures and processes deep within tissues with high resolution. It combines the...

deep ultraviolet

Deep ultraviolet (DUV or deep-UV) refers to a specific range of ultraviolet light with shorter wavelengths than those in the UV-A and UV-B regions. The exact wavelength range considered as DUV can...

deep-depletion CCD

A CCD device for sensing longer wavelengths, such as NIR and IR, that has a deeper depletion region than would be necessary for sensing in the visible wavelength range. Because the depth of charge...

deep-ultraviolet laser

A deep-ultraviolet (DUV) laser is a type of laser that emits light in the deep ultraviolet region of the electromagnetic spectrum, typically with wavelengths ranging from about 200 nm down to 10 nm....

deeply depressed cladding fiber

An optical fiber, usually a single-mode fiber, that has an outer cladding with nearly the same index of refraction as the core and an inner cladding with a very low index of refraction.

defect function -> error function

A single number, defined by the computer program or the user that expresses the performance of an optical system. Also known as merit function and defect function, the error function comprises...

definition

The clarity of an optically reproduced image. Definition is produced by the combination of resolution and acutance.

definition test object

A chart, either printed on paper or prepared photographically on glass plates or film, that consists of 3-bar resolution test objects, sine-wave test objects for modulation transfer function...

deflection

Any bending of a wave of radiation away from its expected path, as, for example, by diffraction or by a magnetic field.

deflection circuit

The circuit that regulates an electron beam's deflection in a cathode-ray tube.

deflection focusing

The progressive defocusing of a cathode-ray tube display image that occurs when the deflected electron beam impinges on the cathode-ray tube screen at a slant.

deflection under static load

For an optical table, the amount of displacement that occurs when a heavy load is placed or moved on the surface. To measure deflection under static load, a 113-kg (250 lb) weight is placed in the...

deflection yoke

A metal coil or coils wrapped around the outside of the neck of a cathode-ray tube. Current passing through the coils produces a magnetic field, which can be used as an alternative to deflection...

deformable mirror device

A spatial light modulator consisting of a metallized polymer film stretched over an array of metal-oxide semiconductor field-effect transistors (MOSFETs). Each mirror element in the film can be...

deformation constant

Any of the constants that relate the tendency of the director to remain parallel to restoring torques throughout the media. The three constants of importance in liquid crystal displays are: splay --...

deg

degrees

degenerate level

The condition in which two or more energy states are identical.

degradation

The gradual decrease over time in output signal with constant input light level.

degreaser

A tank with a boiling solvent at the bottom and a ring of cold piping higher up that condenses the liquid and returns it to the bottom. Objects such as lenses or small metal parts to be cleaned are...

degree of coherence

A quantitative measurement of the coherence of a light source; equal to the visibility (V) of the fringes of a two-beam interference test: where Imax equals the intensity at a maximum of the...

degrees of freedom

The number of unique ways in which a part can move in an alignment system. In static alignment, there are six: one in the direction of and one in rotation about each of the X, Y and Z axes. In...

deka

SI prefix meaning ten, 101.

Delaborne prism -> Dove prism

A form of prism invented by H.W. Dove. It resembles half of a common right-angle prism in which a ray entering parallel to the hypotenuse face is reflected internally at that face and emerges...

delay distortion

The distortion created because the different frequencies of a signal have different propagation velocities through a medium.

delay line

A device used to delay transmission of a signal for functions such as memory loops, sequential processing or built-in testing. The delay can be achieved by coiling long lengths of coaxial cable or...

delay time

The interval between direction of signal to a light-emitting diode and attainment of 10 percent output current in the photodetector.

deliquescent

Description of a material, such as a water-soluble salt, that will continue absorbing moisture from the surrounding atmosphere until it dissolves into a liquid.

delta error

The term delta error (delta-E) generally refers to the difference or change in error between two values or states. The word "delta" is often used in mathematics and science to represent a change or...

delta prism

A compact, folded version of a Dove prism, made of high-index glass with a silvered base and used for image rotation.

DEM

digital elevation model

Photonics Dictionary

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