3/26/2023 0 Comments Diffraction of lightThe light emitted or reflected from the grooves causes interference. Light emitted or reflected from the grooves causes interference. ) corresponding to these slits, or G1,G2.) at equal intervals (in a grating). Diffraction gratings have grooves or other structures (S1, S2. Light incident on a microscopic slit S0 diffracts in various directions, with S0 as the wave source. Diffraction gratings use the diffraction phenomenon of light. The basic principle of diffraction gratings are illustrated in the figure below. Diffraction gratings use the fact that the diffraction direction of the incident light diffracts in different directions, depending on the wavelength of the light to disperse it. Prisms are made from optical glass and disperse light using different refractive indices for each wavelength of light. As a result, the incident light can be spectrally split according to wavelength.Ĭompared to prisms, diffraction gratings are used in many spectrometers because of their superior light resolution and equal dispersion at all wavelengths. These grooves scatter the incident light, resulting in interference fringes. Principle of Diffraction Gratingsĭiffraction gratings are made by vapor-depositing a metal such as aluminum on a glass substrate and engraving a large number of parallel lines (15,000 to 30,000 for UV to visible light and 1,500 to 2,500 for infrared light). They are also used in spectrophotometers for astronomical observations, various spectroscopic analyzers in the natural sciences, and manufacturing and quality control equipment for pharmaceuticals and chemicals. The gratings are used in devices that use this property to control the wavelength of light.įor example, they are used in monochromators that emit light at a single wavelength and polychromators that emit light at a fixed wavelength. Uses of Diffraction Gratingsĭiffraction gratings have fine grooves on their surfaces, and they have the property of dividing incident light spectrally into different wavelengths. Since diffraction grating can extract light of a certain wavelength, they are used in monochromators, which emit light of a single wavelength, and polychromators, which emit light of a fixed wavelength range. Each has a slightly different structure, and therefore, different spectral performance. Types include transmissive, reflective, and brazed types. When light is irradiated onto a diffraction grating, the effect of the grooves causes a diffraction of light, which allows the incident light to be divided according to its wavelength. A diffraction grating is an optical element fabricated on a glass substrate with finely spaced grooves at equal intervals.
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