Diffraction Gratings for Oriel 77250 and 77250B Monochromators

Compare	Model	Compatibility	rankScore	Type	Grooves per mm	Blaze Wavelength	Peak Efficiency	Primary Wavelength Region	Availability	Price	Brand
77296 77250 Monochromator Grating, Holographic, 1200 l/mm, 240 nm blaze, 200-600 nm $510 In Stock	77296 77250 Monochromator Grating, Holographic, 1200 l/mm, 240 nm blaze, 200-600 nm	UNIVERSAL	1.0	Holographic	1200	240 nm	63%	200 to 600 nm	In Stock	$510	Oriel Instruments
77298 77250 Monochromator Grating, Ruled, 1200 l/mm, 360 nm blaze, 200-1000 nm $405 5 Weeks	77298 77250 Monochromator Grating, Ruled, 1200 l/mm, 360 nm blaze, 200-1000 nm	UNIVERSAL	1.0	Ruled	1200	360 nm	80%	200 to 1000 nm	5 Weeks	$405	Oriel Instruments
77299 77250 Monochromator Grating, Ruled, 600 l/mm, 1000 nm blaze, 650-2000 nm $405 4 Weeks	77299 77250 Monochromator Grating, Ruled, 600 l/mm, 1000 nm blaze, 650-2000 nm	UNIVERSAL	1.0	Ruled	600	1000 nm	83%	650 to 2000 nm	4 Weeks	$405	Oriel Instruments
77300 77250 Monochromator Grating, Ruled, 300 l/mm, 1700 nm blaze, 1100-2400 nm $405 Contact Us	77300 77250 Monochromator Grating, Ruled, 300 l/mm, 1700 nm blaze, 1100-2400 nm	UNIVERSAL	1.0	Ruled	300	1700 nm	90%	1100 to 2400 nm	Contact Us	$405	Oriel Instruments
77301 77250 Monochromator Grating, Ruled, 150 l/mm, 4000 nm blaze, 2500-8000 nm $405 Contact Us	77301 77250 Monochromator Grating, Ruled, 150 l/mm, 4000 nm blaze, 2500-8000 nm	UNIVERSAL	1.0	Ruled	150	4000 nm	75%	2500 to 8000 nm	Contact Us	$405	Oriel Instruments
77302 77250 Monochromator Grating, Ruled, 75 l/mm, 8 um blaze, 4.5-20 um $405 Contact Us	77302 77250 Monochromator Grating, Ruled, 75 l/mm, 8 um blaze, 4.5-20 um	UNIVERSAL	1.0	Ruled	75	8000 nm	80%	4.5 to 20 µm	Contact Us	$405	Oriel Instruments
77303 77250 Monochromator Grating, Ruled, 50 l/mm, 12 um blaze, 7-23 um $405 Contact Us	77303 77250 Monochromator Grating, Ruled, 50 l/mm, 12 um blaze, 7-23 um	UNIVERSAL	1.0	Ruled	50	12000 nm	80%	7 to 23 µm	Contact Us	$405	Oriel Instruments
77304 77250 Monochromator Grating, Ruled, 600 l/mm, 225 nm blaze, 200-400 nm $405 Contact Us	77304 77250 Monochromator Grating, Ruled, 600 l/mm, 225 nm blaze, 200-400 nm	UNIVERSAL	1.0	Ruled	600	225 nm	60%	200 to 400 nm	Contact Us	$405	Oriel Instruments
77305 77250 Monochromator Grating, Ruled, 600 l/mm, 700 nm blaze, 450-2000 nm Show	77305 77250 Monochromator Grating, Ruled, 600 l/mm, 700 nm blaze, 450-2000 nm	UNIVERSAL	1.0	Ruled	600	700 nm	78%	450 to 2000 nm	Show		Oriel Instruments
77306 77250 Monochromator Grating, Ruled, 1200 l/mm, 750 nm blaze, 475-1000 nm Contact Us	77306 77250 Monochromator Grating, Ruled, 1200 l/mm, 750 nm blaze, 475-1000 nm	UNIVERSAL	1.0	Ruled	1200	750 nm	78%	475 to 1000 nm	Contact Us		Oriel Instruments
77308 77250 Monochromator Grating, Ruled, 2400 l/mm, 275 nm blaze, 200-500 nm $510 Contact Us	77308 77250 Monochromator Grating, Ruled, 2400 l/mm, 275 nm blaze, 200-500 nm	UNIVERSAL	1.0	Ruled	2400	275 nm	69%	200 to 500 nm	Contact Us	$510	Oriel Instruments
77309 77250 Monochromator Grating, Holographic, 1800 l/mm, 560 nm blaze, 320-670 nm $510 Contact Us	77309 77250 Monochromator Grating, Holographic, 1800 l/mm, 560 nm blaze, 320-670 nm	UNIVERSAL	1.0	Holographic	1800	560 nm	54%	320 to 670 nm	Contact Us	$510	Oriel Instruments
77310 77250 Monochromator Grating, Holographic, 3600 l/mm, 300 nm blaze, 250-330 nm $510 Contact Us	77310 77250 Monochromator Grating, Holographic, 3600 l/mm, 300 nm blaze, 250-330 nm	UNIVERSAL	1.0	Holographic	3600	300 nm	60%	250 to 330 nm	Contact Us	$510	Oriel Instruments
77317 77250 Monochromator Grating, Ruled, 150 l/mm, 800 nm blaze, 425-1600 nm Contact Us	77317 77250 Monochromator Grating, Ruled, 150 l/mm, 800 nm blaze, 425-1600 nm	UNIVERSAL	1.0	Ruled	150	800 nm	80%	425 to 1600 nm	Contact Us		Oriel Instruments

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.

Diffraction Gratings for Oriel^® 77250 and 77250B Monochromators

Diffraction Gratings for Oriel^® 77250 and 77250B Monochromators

Overview