$Diffraction Gratings for Oriel® 77250 and 77250B Monochromators$

Diffraction Gratings for Oriel^® 77250 and 77250B Monochromators

$Diffraction Gratings for Oriel® 77250 and 77250B Monochromators$

Diffraction Gratings for Oriel^® 77250 and 77250B Monochromators

High quality diffraction gratings are available for use with the Oriel^® 77250 and 77250B monochromators. This selection covers a broad wavelength range, making the 77250 / 77250B a flexible instrument that meets the needs of many different applications. Gratings can be easily interchanged. The 77250 / 77250B is designed to hold one grating at a time.

High quality
Broad wavelength coverage
Easy installation
Efficient performance
Ruled and holographic gratings
Special orders welcome

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Compare	Description	Compatibility	Price
$Diffraction Gratings for 77250 and 77250B Monochromators$	77296 Diffraction Gratings for 77250 and 77250B Monochromators77250 Monochromator Grating, Holographic, 1200 l/mm, 240 nm blaze, 200-600 nm	UNIVERSAL	$520
$Diffraction Gratings for 77250 and 77250B Monochromators$	77298 Diffraction Gratings for 77250 and 77250B Monochromators77250 Monochromator Grating, Ruled, 1200 l/mm, 360 nm blaze, 200-1000 nm	UNIVERSAL	$410
$Diffraction Gratings for 77250 and 77250B Monochromators$	77299 Diffraction Gratings for 77250 and 77250B Monochromators77250 Monochromator Grating, Ruled, 600 l/mm, 1000 nm blaze, 650-2000 nm	UNIVERSAL	$410
$Diffraction Gratings for 77250 and 77250B Monochromators$	77300 Diffraction Gratings for 77250 and 77250B Monochromators77250 Monochromator Grating, Ruled, 300 l/mm, 1700 nm blaze, 1100-2400 nm	UNIVERSAL	$410
$Diffraction Gratings for 77250 and 77250B Monochromators$	77301 Diffraction Gratings for 77250 and 77250B Monochromators77250 Monochromator Grating, Ruled, 150 l/mm, 4000 nm blaze, 2500-8000 nm	UNIVERSAL	$410
$Diffraction Gratings for 77250 and 77250B Monochromators$	77302 Diffraction Gratings for 77250 and 77250B Monochromators77250 Monochromator Grating, Ruled, 75 l/mm, 8 um blaze, 4.5-20 um	UNIVERSAL	$410
$Diffraction Gratings for 77250 and 77250B Monochromators$	77303 Diffraction Gratings for 77250 and 77250B Monochromators77250 Monochromator Grating, Ruled, 50 l/mm, 12 um blaze, 7-23 um	UNIVERSAL	$410
$Diffraction Gratings for 77250 and 77250B Monochromators$	77304 Diffraction Gratings for 77250 and 77250B Monochromators77250 Monochromator Grating, Ruled, 600 l/mm, 225 nm blaze, 200-400 nm	UNIVERSAL	$410
$Diffraction Gratings for 77250 and 77250B Monochromators$	77305 Diffraction Gratings for 77250 and 77250B Monochromators77250 Monochromator Grating, Ruled, 600 l/mm, 700 nm blaze, 450-2000 nm	UNIVERSAL
$Diffraction Gratings for 77250 and 77250B Monochromators$	77306 Diffraction Gratings for 77250 and 77250B Monochromators77250 Monochromator Grating, Ruled, 1200 l/mm, 750 nm blaze, 475-1000 nm	UNIVERSAL

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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.

Easy Installation

These 30 x 30 mm gratings come pre-aligned in their own frames, allowing them to precisely fit inside the instrument. The frame has a tab that allows the grating to be inserted or replaced inside the monochromator without touching its surface. Each grating comes with a protective cover and is labeled with the model number, making interchangeability and storage simple. Note that the instrument will need to be recalibrated after replacing the grating.

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 77250 monochromator's gratings are available with operating ranges from 200 nm to 23 µm.

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.