diffraction grating


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dif·frac·tion grat·ing

(di-frak'shŭn grāt'ing),
A variety of filter composed of lined grooves in a thin layer of aluminum-copper alloy on a glass surface; used in spectrophotometers to disperse light into a spectrum. See: monochromator.

diffraction grating

The device in a spectrophotometer that disperses white light into the colors (wavelengths) of the electromagnetic spectrum, using multiple lines precisely etched into an optically aligned material such as a specialized mirror or metal plate.

diffraction

Deviation of the direction of propagation of a beam of light, which occurs when the light passes the edge of an obstacle such as a diaphragm, the pupil of the eye or a spectacle frame. There are two consequences of this phenomenon. First, the image of a point source cannot be a point image but a diffraction pattern. This pattern depends upon the shape and size of the diaphragm as well as the wavelength of light. Second, a system of close, parallel and equidistant grooves, slits or lines ruled on a polished surface can produce a light spectrum by diffraction. This is called a diffraction grating. See Airy's disc; diffraction fringes; Maurice's theory.
References in periodicals archive ?
Crown manufacturers standard hot stamping products, golds, silvers, metallic colors, pigments, special effects (multi-colored print patterns), as well as holographic images and diffraction gratings.
Large sheets of plastic diffraction grating are readily available.
In particular, diffraction grating elements for 633 nm to 1064 nm waveband with 1600 lines/mm, exhibit a diffraction efficiency of 98% - the highest in this category of technology.
Axion estimates the total capital cost for a single diffraction grating sorting unit, including conveyors and ancillary equipment, at [pounds sterling] 500,000, with a potential payback within four years.
At a glance, the diffraction gratings resemble compacts, or pill boxes, coated in gold substrate.
Because the diffraction grating produces a cylindrical focal plane, it was necessary to move the CCD closer to the telescope compared to its normal focal position.
The quantitative influence of the modification on the optical properties of the diffraction grating was evaluated by measuring the absolute diffraction efficiency (DE) of the gratings.
5, by irradiating a simple 1 D diffraction grating with a laser beam (633 nm He:Ne) a Fourier diffraction pattern is produced.
Novel Fabrication Tolerant Flat-Top Demultiplexers Based on Etched Diffraction Gratings in SOI.
MEMS nanocomposit thin waveguide film is deposited on the glass substrate and then a diffraction grating is embossed on it by hot-embossing procedure.
Finally, the company sells high-efficiency holographic diffraction gratings, which are also used in all of its products.
Modern spectroscopes split light using a plate or a mirror that is engraved with tiny parallel grooves or lines, called a diffraction grating.