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18 terms
Photonics Dictionary: D
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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 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.
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 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...
devitrification
The process by which a vitreous or amorphous substance forms a crystal structure at a specified temperature.
DGaO
Deutsche Gesellschaft für angewandte Optik (German Society for Applied Optics)
diamond-turned optic
Diamond turning refers to a precision machining process used to produce complex optical components, particularly lenses and mirrors, from materials such as metals, plastics, and crystalline materials...
die bonding
Die bonding is a critical process in semiconductor manufacturing and microelectronics assembly, where a semiconductor die or chip is attached and electrically connected to a substrate or a package....
dielectric constant
A number that indicates the magnitude of the shift in a solid of positive and negative charges in opposite directions when a voltage is applied across the solid.
diffraction grating
A diffraction grating is an optical component consisting of a surface with a periodic structure of equally spaced, parallel grooves or rulings. These rulings act as an array of closely spaced slits...
diffuse reflectance spectroscopy
Diffuse reflectance spectroscopy (DRS) is a nondestructive analytical technique used to investigate the optical properties of materials, particularly in the field of spectroscopy. Unlike traditional...
diffuse transmission
Transmission accompanied by diffusion or scatter to the extent that there is no regular or direct transmission.
dig
A cosmetic defect on the surface of an optical element. A dig is nearly equal in terms of its length and width. The size is specified numerically by its average diameter in 1/100 of a millimeter;...
directed energy
Directed energy refers to a type of energy that is emitted and transferred in a controlled direction. The term is often associated with military and technological applications where energy, typically...
directional reflectance
Reflectance in a specified direction, for a specified direction of incident illumination.
dust counting microscope
A microscope that has been modified to permit the quantitative analysis of dust samples.
dynamic fatigue
Stress applied to an optical fiber at a constant rate.
Photonics Dictionary
D
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