Patterned gratings – holographic or etched optical gratings / diffraction gratings
Patterned gratings – holographic or etched optical gratings / diffraction gratings
We offer a huge selection of etched and holographic flat diffraction gratings for your applicationOptical gratings, or diffraction gratings, are used as dispersive elements. Both etched and holographic plane gratings are used in spectroscopy (e.g. monochromators) or in lasers (e.g. pulse compression) and many other applications in the field of optics.
Product Description
Optical gratings are used as dispersive elements in various application areas.
For example, in photolithography for generating narrow-band laser light from excimer lasers (narrowing) or for pulse compression in laser technology. Other examples are multiplexing and demultiplexing in fibre optic networks in telecommunications. Classic areas of application are also the use of such diffraction gratings as monochromators in measuring devices for instrumental analysis or their use in spectrometers for astronomical applications.
A basic distinction is made between scribed and holographic gratings.
The scribed gratings are divided mechanically, the grating grooves are characterised by a sharp, sawtooth-like geometry. Mechanical scribing is carried out using ground diamond gravers, whereby parallel grooves are scribed into a metal surface – maximum precision is required here.
Scored gratings have a very high efficiency in a narrow range around the blaze angle or blaze wavelength. The gratings can be produced both as reflection and transmission gratings (link to transmission grating page). In addition to flat gratings, imaging gratings (link to concave gratings) are also available in many different sizes and radii.
The holographic gratings are produced lithographically, the grating grooves have a sinoidal geometry. Using two coherent partial beams of a laser, the desired interference pattern is created in a photoresist (on a substrate) with areas of stronger and weaker exposure. During subsequent development, one of the two areas is preferentially removed (depending on the type of developer), creating “mountains and valleys” in the surface. Holgraphic gratings can be used over a wide wavelength range and are characterised by a low proportion of scattered light. In addition to flat gratings, imaging gratings (link to concave gratings) are also available in many different sizes and radii.
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Specifications
Holographic diffraction gratings:Standard sizes: 2 x 2 mm² to
28 x 102 mm² (substrate area)
Line density: 750 lines/mm to 4320 lines/mm
Substrate material: BK-7, fused silica, low thermal expansion glasses, float glass, copper
Coatings: Aluminium, gold, MgF2
Etched diffraction gratings:
Standard sizes: 2 x 2 mm² to 320 x 420 mm² (substrate area)
Line density: 20 lines/mm to 5880 lines/mm
Substrate material: BK-7, fused silica, low thermal expansion glasses, float glass, copper
Coatings: aluminium, gold, MgF2
Options and Accessories
• Echelle
gratings• Custom gratings for OEM customers•
Mosaic gratings (composite gratings for astronomical applications)
