Diffraction Gratings for Oriel® MS257 Monochromator and Imaging Spectrograph
Diffraction Gratings for Oriel® MS257 Monochromator and Imaging Spectrograph
The following gratings are listed for reference only, as Newport has officially discontinued factory service support for the MS257 series. Contact your Newport sales representative for more information.
High quality diffraction gratings are available for use with the Oriel® MS257 monochromator and imaging spectrograph. These instruments are designed to hold up to four gratings simultaneously. This selection covers a broad wavelength range and gratings can be replaced, making the MS257 a flexible instrument that meets the needs of many different applications.
- Designed for use with MS257 monochromators and spectrographs
- Broad wavelength coverage
- Efficient diffraction performance
- Ruled and holographic gratings See All Features
| Compare | Description | Drawings, CAD & Specs | Avail. | Price | ||
|---|---|---|---|---|---|---|
 | 77740 Diffraction Gratings for MS257MS257 Grating, Ruled, 2400 lines/mm, 275 nm blaze, 200-700 nm range | |||||
 | 77741 Diffraction Gratings for MS257MS257 Grating, Holographic, 1200 lines/mm, 240 nm blaze, 200-600 nm | |||||
| 77742 Diffraction Gratings for MS257MS257 Grating, Ruled, 1200 lines/mm, 360 nm blaze, 200-1400 nm range | |||||
| 77743 Diffraction Gratings for MS257MS257 Grating, Ruled, 600 lines/mm, 225 nm blaze, 200-400 nm range | |||||
| 77744 Diffraction Gratings for MS257MS257 Grating, Ruled, 600 lines/mm, 370 nm blaze, 270-1000 nm range | |||||
| 77745 Diffraction Gratings for MS257MS257 Grating, Ruled, 600 lines/mm, 1000 nm blaze, 650-2200 nm range | |||||
| 77748 Diffraction Gratings for MS257MS257 Grating, Ruled, 300 lines/mm, 1700 nm blaze, 1100-2400 nm range | |||||
| 77749 Diffraction Gratings for MS257MS257 Grating, Ruled, 200 lines/mm, 950 nm blaze, 580-1900 nm range | |||||
| 77750 Diffraction Gratings for MS257MS257 Grating, Ruled, 150 lines/mm, 3500 nm blaze, 2500-11000 nm range | |||||
| 77751 Diffraction Gratings for MS257MS257 Grating, Ruled, 75 lines/mm, 7 um blaze, 4.5-20 um range |
Features
Selecting a Diffraction Grating
Diffraction gratings are primarily selected based on the spectral resolution requirements of the application and the spectral region of interest.
Spectral Resolution
Diffraction gratings are available in various groove densities (i.e. lines/mm). Higher groove densities give higher reciprocal dispersion and therefore higher resolution. The grating dispersion is similar for gratings with the same groove density. The exact dispersion is dependent upon other physical characteristics of the grating in addition to the groove density.
The resolution is the ability to separate wavelengths. It is usually expressed as the Full Width Half Maximum (FWHM). The resolution can be theoretically determined by multiplying the reciprocal dispersion of the grating by the slit width. The monochromator bandpass with a 1200 lines/mm grating is half that of the same arrangement with a 600 lines/mm grating. Note that this simple relationship is not accurate for slit widths below 50 µm, as the optical aberrations begin to play a role in the resolution.
Using a grating with a high groove density may increase resolution, but the spectral range narrows. The dispersion of a grating changes inversely with the groove density. If the groove density is halved, the dispersion is doubled. When performing a scan, to save time it is important to consider the resolution when determining the interval wavelength (i.e. the step size) of the scan. For example, if the resolution with a particular grating and slit is 5 nm, it is not necessary or practical to perform a scan every 1 nm.
Spectral Region of Interest
The Blaze Wavelength is the wavelength for which a blazed diffraction grating is most efficient a diffracting monochromatic light into the first order. Choosing a blaze wavelength that is close to the spectral region of interest will allow for the highest possible 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).
Plane Ruled Diffraction Gratings
High Quality Richardson Diffraction Gratings
Plane ruled and holographic gratings listed here are fabricated from float glass substrates with an aluminum coating. The 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.
