Diferencies ente revisiones de «Rede de difraición»

En [[óptica]], una '''rede de difracción''' ye un [[preséu ópticu|componente ópticu]] con un patrón regular, qu'estrema ([[difracción|difracta]]) la lluz en dellos fexes de lluz que viaxen en distintes direccionesdireiciones. Les direccionesdireiciones d'esos fexes de lluz dependen del espaciado de la rede y de la [[llargor d'onda]] de la lluz incidente, de cuenta que la rede actúa como un elementu dispersivo. Gracies a esto, les redes utilícense davezu en [[monocromador]]es y [[espectrómetru|espectrómetros]].

The intensity of the diffraction pattern can be altered by tilting the grating. Especially with reflective gratings (where the holes are replaced by a highly reflective surface), the reflective portion can be [[Blazed grating|tilted (blazed)]] to scatter a majority of the light into the preferred direction of interest (specific diffraction order).

In echelle gratings, however, this behaviour is deliberately used and the [[blaze]] is optimized for multiple overlapping higher orders. Since this overlap is not directly useful, a second, perpendicularly mounted dispersive element ([[grating]] or [[prism (optics)|prism]]) is inserted as an "order separator" or "cross disperser" into the beam path. Hence the spectrum consists of stripes with different, but slightly overlapping, wavelength ranges that run across the imaging plane in an oblique pattern.