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 ?
Udd, Acoustic emission detection using fiber Bragg gratings, SPIE's 8th Annual International Symposium on Smart Structures and Materials, International Society for Optics and Photonics, 2001, pp.
The structure comprises a 1 x 2 optical coupler, an upper optical circulator, a lower optical circulator, a fiber Bragg grating FBGri_1, a fiber Bragg grating FBGri_2, and a balanced detector between the upper and lower photodiodes.
We are enormously optimistic that the proposed passive optical network based on fiber Bragg gratings would turn out to be a right future candidate for monitoring fiber faults.
The index of refraction in a fiber Bragg grating is modeled by
He, "High resolution strain/temperature sensor system based on high finesse fiber Bragg grating Fabry-Perot cavity and wavelength demodulation in the time domain," J.
Therefore, in order to achieve accurate measurement, it is necessary to set the network with three-dimensional distribution of fiber Bragg grating, trying best to use axial mechanical parameters in three directions which measured from the changes of reflected Bragg wavelength.
We can achieve the desired bandwidth requirement by using even weak grating but allowing the fiber Bragg grating with complicated profile.
Andres; Fabrication of chirped fiber Bragg gratings by simple combination of stretching movements, Opt.
com) announced today that Proximion, a leader in Fiber Bragg Gratings (FBG)-based Dispersion Compensation Modules (DCMs), will represent Sweden in its prestigious 2010 Awards program.
Thermal decay of fiber Bragg gratings written in boron and germanium codoped silica fiber.
Piezo sensors and fibre sensors are equally applicable; Fiber Bragg Gratings have the great advantage of lower cost, a much more universal mountability and electromagnetical insensivity against non-welcome impacts from the surrounding manufacturing process.