Compare Description Drawings, CAD & Specs Avail. Price
Diffraction Gratings for CS260 Monochromators and MS260i Spectrographs 74060 Diffraction Gratings for CS260 Monochromators and MS260i SpectrographsDiffraction Grating Assembly, Triple, 275 nm blaze, 200-700 nm
$525
Diffraction Gratings for CS260 Monochromators and MS260i Spectrographs 74061 Diffraction Gratings for CS260 Monochromators and MS260i SpectrographsDiffraction Grating Assembly, Triple, 560nm blaze, 320-925nm
$525
Diffraction Gratings for CS260 Monochromators and MS260i Spectrographs 74062 Diffraction Gratings for CS260 Monochromators and MS260i SpectrographsDiffraction Grating Assembly, Triple, 240nm blaze, 200-600nm
$1,045
Diffraction Gratings for CS260 Monochromators and MS260i Spectrographs 74063 Diffraction Gratings for CS260 Monochromators and MS260i SpectrographsDiffraction Grating Assembly, Triple, 360 nm blaze, 200-1400 nm
$525
Diffraction Gratings for CS260 Monochromators and MS260i Spectrographs 74064 Diffraction Gratings for CS260 Monochromators and MS260i SpectrographsDiffraction Grating Assembly, Triple, 750 nm blaze, 475-1400 nm
$1,045
Diffraction Gratings for CS260 Monochromators and MS260i Spectrographs 74065 Diffraction Gratings for CS260 Monochromators and MS260i SpectrographsDiffraction Grating Assembly, Triple, 225 nm blaze, 200-400 nm
$830
Diffraction Gratings for CS260 Monochromators and MS260i Spectrographs 74066 Diffraction Gratings for CS260 Monochromators and MS260i SpectrographsDiffraction Grating Assembly, Triple, 370 nm blaze, 270-1000 nm
$1,045
Diffraction Gratings for CS260 Monochromators and MS260i Spectrographs 74067 Diffraction Gratings for CS260 Monochromators and MS260i SpectrographsDiffraction Grating Assembly, Triple, 1000 nm blaze, 650-2200 nm
$1,045
Diffraction Gratings for CS260 Monochromators and MS260i Spectrographs 74068 Diffraction Gratings for CS260 Monochromators and MS260i SpectrographsDiffraction Grating Assembly, Triple, 1350 nm blaze, 800-1900 nm
$525
Diffraction Gratings for CS260 Monochromators and MS260i Spectrographs 74069 Diffraction Gratings for CS260 Monochromators and MS260i SpectrographsDiffraction Grating Assembly, Triple, 1325 nm blaze, 875-2200 nm
$1,045
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Features

High Quality

Plane ruled and holographic gratings listed here are fabricated from float glass substrates with an aluminum coating. Oriel monochromators and spectrographs feature diffraction gratings produced by Richardson Gratings. Both Oriel Instruments and Richardson Gratings are part of the Newport family of brands, and have a long history of working together to design instruments that are appropriate for a wide variety of applications.

Plane Ruled Gratings

For a plane blazed grating, the groove spacing and blaze angle determine the distribution of energy. The blaze direction for most gratings is specified for first order Littrow use. In Littrow use, light is diffracted from the grating back toward the source. Gratings used in the Littrow configuration have the advantage of maximum efficiency, or blaze, at specific wavelengths.

Broad Wavelength Coverage

Standard grating assemblies are available from UV, VIS and NIR. The primary wavelength region is where the grating efficiency is greater than or equal to 20%. System efficiency will also be affected by the reflectivity of the mirrors and the grating angle, at any wavelength. The CS260 and MS260i gratings are available with operating ranges from 200 nm to 20 µm. For the broadest wavelength coverage, select grating assemblies with triple mounts. Three gratings extend the usable wavelength range of the instrument. For those applications requiring reduced stray light and/or increased throughput, select grating assemblies with double mounts. If all of these factors are important, consider using the Oriel MS257 monochromator or imaging spectrograph which holds up to four gratings and has very low stray light.

Blazed Holographic Gratings

Holographic gratings normally have a sinusoidal groove shape, which is the result of recording interference fringe fields in photoresist material. Since the grooves are symmetrical, they do not have a preferred blaze direction and hence the gratings carry no blaze arrows. The range of useful diffraction efficiency is controlled by varying the modulation (the ratio of groove depth to groove spacing). The lower the modulation, the shorter the wavelength limit to which the grating can be used, but the peak efficiency may be lowered as well. We have found that three modulation levels are adequate for nearly all purposes.

High Efficiency

High-efficiency gratings are desirable for several reasons. A grating with high efficiency is more useful than one with lower efficiency in measuring weak transition lines in optical spectra. A grating with high efficiency may allow the reflectivity and transmissivity specifications for the other components in the spectrometer to be relaxed. Moreover, higher diffracted energy may imply lower instrumental stray light due to other diffracted orders, as the total energy flow for a given wavelength leaving the grating is conserved (being equal to the energy flow incident on it minus any scattering and absorption).

Special Orders Welcome

In addition to the gratings listed here, special order gratings may also be available for use in a wide variety of applications. Custom grating requests include gold coating for increased IR efficiency, AlMgF2 coating for increased UV efficiency and many other requests. Gratings may be installed into a variety of mounts for use in specific monochromators or spectrographs. Contact Newport Sales for more information.

Resources

Technical Notes