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About Diffraction Gratings
Diffraction gratings are optical elements that are similar to lenses or mirrors. Diffraction gratings are superimposed with a precise pattern of microscopic periodic structures. Usually these are in a pattern of corrugated surface grooves (a surface-relief grating), though some gratings are formed by the periodic variation of the refractive index inside the grating itself (a volume grating). Gratings used to disperse ultraviolet (UV) and visible light usually contain between 300 and 3000 grooves per millimeter, so the distance between adjacent grooves is on the order of one micron. Diffraction gratings may be either ruled or holographic, although there is a wider range of groupings within each style.
Ruled diffraction gratings are produced by physically forming grooves into a reflective surface with a diamond mounted on a ruling engine. Ruled gratings have a relatively sharp peak around their blaze wavelength as a consequence of their "saw tooth" groove profile. The distance between adjacent grooves and the angle the grooves form with respect to the substrate influence both the dispersion and efficiency of a grating. Diffraction gratings can be ruled on a variety of substrates; for example, glass, metal and ceramic. Groove density ranges from 20 to 1800 grooves/mm. This is the preferred type of grating for the infrared (IR) because of the relatively large spaces between grooves. In this case, there is better control over blaze shape and defects are small relative to the size of the spacing.
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Preface Diffraction and imaging are central topics in many modern and scientific fields. Fourier analysis and sythesis techniques are a unifying theme throughout this subject matter. For example,...(read more)
Engineering Web: Diffraction Gratings
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Diffraction Gratings See Newport Corporation Information |
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Diffraction - Wikipedia, the free encyclopedia Diffraction From Wikipedia, the free encyclopedia The intensity pattern formed on a screen by diffraction from a square aperture |
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Diffraction grating - Wikipedia, the free encyclopedia The principles of diffraction gratings were discovered by James Gregory, about a year after Newton's prism experiments, initially with artifacts such |
Part Numbers for Diffraction Gratings
| Part # | Distributor | Manufacturer | Product Category | Description |
|---|---|---|---|---|
| S63131 | Amazon | American Educational Products | BISS | Advanced Spectrometer; Inc. Extra Bulbs, Diffraction Grating, Power Adapter; 21 x 16 x 16 in. |
| S90393 | Amazon | American 3B Scientific | BISS | 3B Scientific Diffraction Grating Set |
| S42592 | Amazon | American Educational Products | BISS | Intermediate Spectrometer; Metal ; w/ 3 x 2.5cm Equilateral Prism, 600 Lines/mm Diffraction Grating |
| S42550 | Amazon | Wabash Instrument Corporation | BISS | Mounted Spectroscope with Tripod; Replica Diffraction Grating 15,000 Lines/In. |
