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  2. Diffraction grating - Wikipedia

    en.wikipedia.org/wiki/Diffraction_grating

    A blazed diffraction grating reflecting only the green portion of the spectrum from a room's fluorescent lighting. For a diffraction grating, the relationship between the grating spacing (i.e., the distance between adjacent grating grooves or slits), the angle of the wave (light) incidence to the grating, and the diffracted wave from the grating is known as the grating equation.

  3. Blazed grating - Wikipedia

    en.wikipedia.org/wiki/Blazed_grating

    A special form of a blazed grating is the echelle grating. It is characterized by particularly large blaze angle (>45°). Therefore, the light hits the short legs of the triangular grating lines instead of the long legs. Echelle gratings are mostly manufactured with larger line spacing but are optimized for higher diffraction orders.

  4. Foucault knife-edge test - Wikipedia

    en.wikipedia.org/wiki/Foucault_knife-edge_test

    Some telescope makers use a variant of the Foucault test called a Ronchi test that replaces the knife edge with a grating (similar to a very coarse diffraction grating) comprising fine parallel wires, an etching on a glass plate, a photograph negative or computer printed transparency. Ronchi test patterns are matched to those of standard ...

  5. Electromagnetically induced grating - Wikipedia

    en.wikipedia.org/wiki/Electromagnetically...

    Electromagnetically induced grating (EIG) is an optical interference phenomenon where an interference pattern is used to build a dynamic spatial diffraction grating in matter. EIGs are dynamically created by light interference on optically resonant materials and rely on population inversion and/or optical coherence properties of the material.

  6. Category:Diffraction gratings - Wikipedia

    en.wikipedia.org/wiki/Category:Diffraction_gratings

    Diffraction grating; B. Blazed grating; E. Echelle grating; G. Grism; H. Holographic grating This page was last edited on 5 October 2021, at 00:40 (UTC). Text is ...

  7. Joseph von Fraunhofer - Wikipedia

    en.wikipedia.org/wiki/Joseph_von_Fraunhofer

    He developed diffraction grating and also invented the spectroscope. In 1814, he discovered and studied the dark absorption lines in the spectrum of the sun now known as Fraunhofer lines. [2] The German research organization Fraunhofer Society, which is Europe's biggest Society for the advancement of applied research, is named after him.

  8. Echelle grating - Wikipedia

    en.wikipedia.org/wiki/Echelle_grating

    An echelle grating (from French échelle, meaning "ladder") is a type of diffraction grating characterised by a relatively low groove density, but a groove shape which is optimized for use at high incidence angles and therefore in high diffraction orders. Higher diffraction orders allow for increased dispersion (spacing) of spectral features at ...

  9. Off-axis illumination - Wikipedia

    en.wikipedia.org/wiki/Off-axis_illumination

    If the light is incident on the grating at the normal angle (along the axis of the optical system), then the zero-th diffracted order light continues to propagate along the optical system axis (as if just passing through the grating without being affected), while the other diffraction orders are diffracted sideways, with the amount of angular ...