Compare Model Drawings, CAD & Specs Grating Mount Type Blaze Wavelength Primary Wavelength Region Grooves per mm Availability Price
$558
In Stock
Triple Ruled 275 nm 200 to 700 nm 2400
In Stock
$510
2 Weeks
Triple Holographic 560 nm 320 to 925 nm 1800
2 Weeks
$500
In Stock
Triple Holographic 240 nm 200 to 600 nm 1200
In Stock
$510
In Stock
Triple Ruled 360 nm 200 to 1400 nm 1200
In Stock
$542
In Stock
Triple Ruled 750 nm 475 to 1400 nm 1200
In Stock
$542
In Stock
Triple Ruled 225 nm 200 to 400 nm 600
In Stock
$510
In Stock
Triple Ruled 370 nm 270 to 1000 nm 600
In Stock
$510
In Stock
Triple Ruled 1000 nm 650-2200 nm 600
In Stock
In Stock
Triple Ruled 1350 nm 800 to 1900 nm 600
In Stock
$542
In Stock
Triple Ruled 1325 nm 875 to 2200 nm 600
In Stock
$516
5 Weeks
Triple Ruled 1100 nm 675 to 2500 nm 400
5 Weeks
$516
In Stock
Triple Ruled 1500 nm 925 to 2600 nm 400
In Stock
$549
In Stock
Triple Ruled 475 nm 300 to 1000 nm 300
In Stock
$516
In Stock
Triple Ruled 950 nm 625 to 2000 nm 300
In Stock
$531
In Stock
Triple Ruled 1700 nm 1100 to 2400 nm 300
In Stock
$500
2 Weeks
Triple Ruled 226 nm 200 to 500 nm 246.16
2 Weeks
$500
2 Weeks
Triple Ruled 950 nm 580 to 1900 nm 200
2 Weeks
$500
In Stock
Triple Ruled 300 nm 200 to 650 nm 150
In Stock
$531
In Stock
Triple Ruled 775 nm 425 to 1750 nm 150
In Stock
$586
In Stock
Triple Ruled 4000 nm 2500 to 12000 nm 150
In Stock
$554
In Stock
Triple Ruled 410 nm 260 to 550 nm 121.6
In Stock
$500
In Stock
Triple Ruled 7000 nm 4.5 to 20 µm 75
In Stock
$656
In Stock
Double Ruled 275 nm 200 to 700 nm 2400
In Stock
$611
In Stock
Double Holographic 560 nm 320 to 925 nm 1800
In Stock
$663
In Stock
Double Holographic 240 nm 200 to 600 nm 1200
In Stock
$611
In Stock
Double Ruled 360 nm 200 to 1400 nm 1200
In Stock
$611
In Stock
Double Ruled 750 nm 475 to 1400 nm 1200
In Stock
$625
In Stock
Double Ruled 225 nm 200 to 400 nm 600
In Stock
$683
3 Weeks
Double Ruled 370 nm 270 to 1000 nm 600
3 Weeks
$611
In Stock
Double Ruled 1000 nm 650 to 2200 nm 600
In Stock
$656
2 Weeks
Double Ruled 1325 nm 875 to 2200 nm 600
2 Weeks
$643
2 Weeks
Double Ruled 1100 nm 675 to 2500 nm 400
2 Weeks
$656
6 Weeks
Double Ruled 1500 nm 925 to 2600 nm 400
6 Weeks
$656
2 Weeks
Double Ruled 950 nm 625 to 2000 nm 300
2 Weeks
2 Weeks
Double Ruled 1700 nm 1100 to 2400 nm 300
2 Weeks
$643
2 Weeks
Double Ruled 226 nm 200 to 500 nm 246.16
2 Weeks
2 Weeks
Double Ruled 300 nm 200 to 650 nm 150
2 Weeks
$656
In Stock
Double Ruled 2500 nm 2500 to 3250 nm 150
In Stock
$604
In Stock
Double Ruled 4000 nm 2500 to 12000 nm 150
In Stock
$643
2 Weeks
Double Ruled 410 nm 260 to 550 nm 121.6
2 Weeks
$629
In Stock
Double Ruled 7000 nm 4.5 to 20 µm 75
In Stock
$531
In Stock
Triple Ruled 500 nm 300 to 1100 nm 1200
In Stock
$500
In Stock
Triple Ruled 975 nm 350 to 1400 nm 1200
In Stock

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.