Diffraction Gratings from Jobin Yvon

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$Diffraction Gratings from Jobin Yvon$ Jobin Yvon is the world's largest manufacturer of diffraction gratings. We offer a full range of standard diffraction gratings as well as custom items manufactured to your specifications.

For a list of our standard grating and their specifications, please see our Grating Catalogue.

Holographic

The extremely flexible holographic technique can create many grating configurations - planar, curved (for example concave and toroidal), aberration-corrected, with uniform and non-uniform groove spacings.

Holographic gratings are the type of choice for the visible and UV. They typically exhibit less stray light and "ghosts" than classically ruled gratings, because they have fewer random and systematic imperfections.

Today, most gratings are holographically produced. The grating is made by means of interfering light patterns, produced from laser sources, on a substrate coated with photoresist film. After exposure, the pattern is etched into the substrate to make the master grating. Blazing (shaping the grooves) of the grating is accomplished by means of a chemical etch, possibly followed by an ion etch to achieve the desired blaze shape. Groove density ranges from 65 to more than 5,000 grooves/mm.

Curved gratings allow for simplified designs in aberration-corrected optical devices, because a single curved grating can often replace a plane grating and one or two curved mirrors.

Classically Ruled

These are planar gratings prepared by means of a precision ruling engine with a diamond cutting tool. Gratings can be ruled on a variety of substrates; for example, glass, metal and ceramic. Groove density ranges from 20 to 1800 grooves/mm. This is the preferred type of grating for the infrared (IR) because of the relatively large spaces between grooves. In this case, there is better control over blaze shape and defects are small relative to the size of the spacing.

UV and X-ray

These are planar gratings with finely spaced grooves used at glancing angles in order to diffract UV light (UV, VUV, FUV and EUV) and soft X-rays.

Aberration Corrected

These holographic, curved gratings minimise optical aberrations, such as coma, in grating-based systems. They are essential components in simple, compact, high-throughput spectrographs and monochromators, and in diffraction systems employing fibre optics or solid state array detectors, or both. Jobin Yvon has been a leading producer of aberration-corrected gratings since the early 1970s.

Pulse Compression

One way to achieve very short laser light pulses is to use a pair of special planar diffraction gratings to compress the duration of the pulse. The gratings are made of thermally stable, temperature resistant materials to withstand intense laser light. Ultra-short laser pulses are mainly used in research of fast transient phenomena.

High Power & Temperature

Gratings used with high power lasers or in high temperature environments need to be stable at elevated temperatures and stable against thermal shock. The answer is a grating made of thermally stable material such as metal, glass, or even special refractory materials (for example, silicon carbide and ceramic), which is coated with a stable, reflecting metal.

Masters

A master grating is the original ruled or holographic grating produced on a hard substrate. Many replica gratings may be made from a single master grating. A master grating can, of course, be used as the diffracting element of a system. Masters are typically used in extreme environments, in space research, or if stray light must be kept to an absolute minimum.

Replicas

Replica gratings may be made relatively inexpensively from a master by means of thin film casting techniques. The film, an organic material, is then bonded to an appropriate substrate and reflectorised. The great advantage of replicas is the reproducibility, or uniformity, of performance characteristics from grating to grating. This uniformity can be important to OEM manufacturers. Although the amount of stray light is slightly greater with replicas than with masters, it is quite acceptable in most applications.

Mounting

Gratings are usually mounted in a holder before being assembled into an optical device. Jobin Yvon can supply gratings either mounted or unmounted, in accordance with the requirements of the customer. All types of mountings, including custom designs, are available.