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12 terms
Photonics Dictionary: D
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light diffraction x
D x
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...
dielectric coated grating
A shallow, fine-pitch diffraction grating having a precise dielectric overcoating that experimentally has absorbed wavelength-specific incident light that is polarized in the P-plane.
differential interference contrast microscopy
Differential interference contrast (DIC) microscopy, also known as Nomarski interference contrast microscopy, is an optical imaging technique used in microscopy to enhance the contrast of transparent...
diffraction
As a wavefront of light passes by an opaque edge or through an opening, secondary weaker wavefronts are generated, apparently originating at that edge. These secondary wavefronts will interfere with...
diffraction angle
The angle that lies between the direction of an incident light beam and any resulting diffracted beam.
diffraction efficiency
Diffraction efficiency is a measure of how effectively a diffractive optical element (DOE) or diffraction grating directs light into specific diffraction orders or achieves a desired optical effect....
diffraction fanning
The formation of a fan of light or energy rays in a beam as the beam passes through an extremely narrow aperture.
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...
diffraction pattern
The interference pattern formed by light waves diffracted at the edges of an object as seen on a screen placed in their path.
diffraction rings
1. The ring patterns of light that seem to encircle particles in the field of a microscope. 2. See Newton's rings.
diffraction spectrum
In spectroscopy, the parallel bands that vary in lightness and darkness or color, and that are formed when light is diffracted by a sample.
diffraction velocimeter
->
laser velocimeter
A system that uses a continuous-wave laser to measure the velocity of an object by focusing the laser beam on the object, perpendicular to its direction of motion. An optical grating receives...
Photonics Dictionary
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