Compare Model Drawings, CAD & Specs Primary Wavelength Region Grooves per mm Type Blaze Wavelength Peak Efficiency Availability Price
$911
In Stock
200 to 800 nm 2400 Ruled 275 nm 69%
In Stock
$831
In Stock
320 to 1070 nm 1800 Holographic 560 nm 54%
In Stock
$831
In Stock
200 to 600 nm 1200 Holographic 240 nm 63%
In Stock
$882.71
200 to 1600 nm 1200 Ruled 360 nm 80%
$831
475 to 1600 nm 1200 Ruled 750 nm 78%
$831
200 to 400 nm 600 Ruled 225 nm 60%
$831
450 to 2000 nm 600 Ruled 700 nm 78%
$908.46
In Stock
650 to 2200 nm 600 Ruled 1000 nm 83%
In Stock
$908.46
In Stock
1100 to 2400 nm 300 Ruled 1700 nm 90%
In Stock
$899
3.5 to 10.25 µm 150 Ruled 5000 nm 85%
$847.69
In Stock
4.5 to 20 µm 75 Ruled 7 µm 80%
In Stock
$599.46
7 to 23 µm 50 Ruled 12 µm 80%
$814
In Stock
425 to 1600 nm 150 Ruled 800 nm 80%
In Stock
$855
900 to 3000 nm 600 Ruled 1600 nm 85%
$775.59
In Stock
300 to 1100 nm 1200 Ruled 500 nm 73%
In Stock
$831
In Stock
270 to 1000 nm 600 Ruled 370 nm 75%
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.

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.

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 CS130 monochromator's gratings are available with operating ranges from 200 nm to 23 µm.

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.