Optical gratings – diffraction gratings – custom shapes
Optical gratings – diffraction gratings – custom shapes
Whether Echelle gratings, mosaic gratings or ‘Grism’ – RGL develops and manufactures these and other special types of optical diffraction gratings.Special custom-made gratings from Richardson Grating Lab offer unique properties for specific applications – such as Echelle gratings with extremely high resolution, mosaic gratings assembled from larger gratings for astronomical applications, or ‘grisms’ (combinations of prisms and gratings).
Product Description
Optical gratings are used as dispersive elements in various application areas.
In addition to standard gratings, RGL also develops and manufactures customised shapes.
Echelle gratings are a special form of flat reflective grating. Echelle gratings utilise the small steep flank of the groove for reflection and interference. This results in high blaze angles in the typical range of 60° to 75°. We offer Echelle gratings with blaze angles from 32° to 80.7°. The groove densities are relatively low in the range of 13 to 316 lines/mm. These gratings are used in high diffraction orders and achieve high
high resolutions and a high diffraction efficiency in a narrow wavelength range. Applications with utilisation up to the 100th order are not uncommon here. In most cases, a second grating or another optical component is used to separate the orders. Typical applications are spectrometers for recording stellar spectra. Echelle gratings are also frequently used in the field of analytical chemistry, e.g. in “LIBS” or “RAMAN” spectrometers. High spectral resolution and compact design are important advantages of these gratings.
A “grism” is a combination of grating and prism. When using such a grism, the light passes through a prism and is subsequently or previously diffracted in transmission by a diffraction grating. This component is used, for example, when the available space is limited or there are special requirements for the beam path. By optimising and adjusting the refractive indices, angles and number of grating grooves, a grism can generate the diffracted beam of a defined wavelength “in line” with the incident beam.
Mosaic gratings are mostly used in the field of astronomy. Here, two individual gratings are put together to extend the limits set in the production of gratings and to increase the active grating area. One challenge in the production of such gratings is the alignment of the two gratings to each other.
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Specifications
Echelle gratings:• Standard sizes: 50 x 100 mm²
to 320 x 420 mm² (substrate area)
• Line density: 13.3 lines/mm to 316 lines/mm
• Substrate material: low thermal expansion glass
• Coatings: aluminium, gold, MgF2
Grisms,
mosaic gratings:
• On request following the creation of a requirements profile
Options and Accessories
Custom grilles for OEM customers
