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Visible Transmission Gratings


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Visible Transmission Gratings

Grating Arrows
Click to Enlarge

Top Image: On one edge of the grating, an arrow parallel to the grating's surface indicates the blaze direction.
Bottom Image: On the opposite edge of the grating, an arrow perpendicular to the grating's surface indicates the transmission direction.
Comparison Graph

Features

  • Optimum Performance in the Visible Spectrum
  • Ideal for Fixed Grating Applications such as Spectrographs
  • Schott B270 Substrate
  • Custom Sizes Available Upon Request

Thorlabs' Visible Transmission Gratings are ideal for fixed grating applications such as spectrographs. The incident light is dispersed on the opposite side of the grating at a fixed angle. Transmission gratings offer low alignment sensitivity, which helps minimize alignment errors. In most cases, the efficiency of these gratings is comparable to that of reflection gratings such as Ruled Gratings or Holographic Gratings when used in the same wavelength range.

Transmission gratings require relatively low groove densities to maintain high efficiency. As the diffraction angles increase with higher groove densities, the refractive properties of the substrate material limits the transmission at the higher wavelengths and performance drops off. The grating dispersion characteristics, however, lend themselves to compact systems utilizing small detector arrays. These gratings are also relatively polarization insensitive. Our visible transmission gratings are offered with four different groove densities in three different sizes.

Common Specifications
Substrate MaterialSchott B270
Thickness3 mm Nominal
Dimensional Tolerance± 0.5 mm
Thickness Tolerance± 0.5 mm

Please see the Selection Guide tab to choose the right grating type for your application.

Warning:

Optical gratings can be easily damaged by moisture, fingerprints, aerosols, or the slightest contact with any abrasive material. Gratings should only be handled when necessary and always held by the sides. Latex gloves or a similar protective covering should be worn to prevent oil from fingers from reaching the grating surface. No attempt should be made to clean a grating other than blowing off dust with clean, dry air or nitrogen. Solvents will likely damage the grating's surface.

Thorlabs uses a clean room facility for assembly of gratings into mechanical setups. If your application requires integrating the grating into a sub-assembly or a setup, please contact us to learn more about our assembly capabilities.

Thorlabs offers 3 types of Reflection Gratings:

Ruled

Ruled Grating

Ruled gratings can achieve higher efficiencies than holographic gratings due to their blaze angles. They are ideal for applications centered at the blaze angle. Thorlabs offers replicated ruled diffraction gratings in a variety of sizes and blaze angles.

Holographic

Holographic Grating

Holographic gratings have a low occurance of periodic errors which results in limited ghosting, unlike ruled gratings. The low stray light of these gratings make them ideal for applications where the signal-to-noise ratio is critical, such as Raman Spectroscopy.

Echelle

Echelle Grating

Echelle gratings are low period gratings designed for use in the high orders. They are generally used with a second grating or prism to separate overlapping diffracted orders. The are ideal for applications such as high-resolution spectroscopy.

Thorlabs offers 3 types of Transmission Gratings:

UV Transmission

UV Transmission Grating

As with all of our transmission gratings, Thorlabs' UV transmission gratings disperse incident light on the opposite side of the grating at a fixed angle. They are ruled and blazed for optimum efficiency in the UV range, are relatively polarization insensitive, and have an efficiency comparable to that of a reflection grating optimized for the UV spectrum. They are ideal for applications that require fixed gratings such as spectrographs.

VIS Transmission

VIS Transmission Grating

As with all of our transmission gratings, Thorlabs' VIS transmission gratings disperse incident light on the opposite side of the grating at a fixed angle. They are ruled and blazed for optimum efficiency in the VIS range, are relatively polarization insensitive, and have an efficiency comparable to that of a reflection grating optimized for the VIS spectrum. They are ideal for applications that require fixed gratings such as spectrographs.

Near IR Transmission

NIR Transmission Grating

As with all of our transmission gratings, Thorlabs' NIR transmission gratings disperse incident light on the opposite side of the grating at a fixed angle. They are ruled and blazed for optimum efficiency in the NIR range, are relatively polarization insensitive, and have an efficiency comparable to that of a reflection grating optimized for the NIR spectrum. They are ideal for applications that require fixed gratings such as spectrographs.

Selecting a grating requires consideration of a number of factors, some of which are listed below:

Efficiency:
Ruled gratings generally have a higher efficiency than holographic gratings. However, holographic gratings tend to have less efficiency variation accross their surface due to how the grooves are made. The efficiency of ruled gratings may be desireable in applications such as fluorescence excitation and other radiation-induced reactions.

Blaze Wavelength:
Ruled gratings have a sawtooth groove profile created by sequentially etching the surface of the grating substrate. As a result, they have a sharp peak around their blaze wavelength. Holographic gratings are harder to blaze, and tend to have a sinusoidal groove profile resulting in a less intense peak around the design wavelength. Applications centered around a narrow wavelength range could benefit from a ruled grating blazed at that wavelength.

Wavelength Range:
Groove spacing determines the optimum spectral range a grating covers and is the same for ruled and holographic gratings having the same grating constant. As a rule of thumb, the first order efficiency of a grating decreases by 50% at 0.66λB and 1.5λB, where λB is the blaze wavelength. Note: No grating can diffract a wavelength greater than 2 times the groove period.

Stray Light:
Due to a difference in how the grooves are made, holographic gratings have less stray light than ruled gratings. The grooves on a ruled grating are machined one at a time which results in a higher frequency of errors. Holographic grooves are made all at once which results in a grating that is virtually free of errors. Applications such as Raman spectroscopy, where signal-to-noise is critical, can benifit from the limited stray light of the holographic grating.

Resolving Power:
The resolving power of a grating is a measure of its ability to spatially separate two wavelengths. It is determined by applying the Rayleigh criteria to the diffraction maxima; two wavelengths are resolvable when the maxima of one wavelength coincides with the minima of the second wavelength. The chromatic resolving power (R) is defined by R = λ/Δλ = nN, where Δλ is the resolvable wavelength difference, n is the diffraction order, and N is the number of grooves illuminated.

For further information about gratings and selecting the grating right for your application, please visit our Grating Tutorial.

Caution:

The surface of a diffraction grating can be easily damaged by fingerprints, aerosols, moisture or the slightest contact with any abrasive material. Gratings should only be handled when necessary and always held by the sides. Latex gloves or a similar protective covering should be worn to prevent oil from fingers from reaching the grating surface. Solvents will likely damage the grating's surface. No attempt should be made to clean a grating other than blowing off dust with clean, dry air or nitrogen. Scratches or other minor cosmetic imperfections on the surface of a grating do not usually affect performance and are not considered defects.

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Posted Comments:
Poster: dsablowski
Posted Date: 2014-02-10 18:19:46.167
Hey, it would be very useful to have round sized gratings, which fit to your tube system! Or rectangular mounts which fit to the tube system. Additionally some more angled optics mounts which fit to the center wavelength of each grating. This would help to implement gratings to optical set-ups.
Poster: besembeson
Posted Date: 2014-02-12 04:15:03.0
Response from Bweh E at Thorlabs: Thanks for the suggestions. We will be looking into such mounts. We may be able to offer a special circular grating to you. I will follow-up with you by email to discuss your requirements for such circular gratins.
Poster: jeffreyb
Posted Date: 2013-09-24 13:46:32.203
Hi, I have been using these gratings to make direct view, low-dispersion spectrographs. I couple the grating to the hypotenuse of 30 60 90 prism made from SF2 (ZF1 in china) The blaze angle of this grating nearly matches the 30 deg apex angle of a Littrow prism. You do not offer a SF2 prism (you used to have it in your catalog as a "Littrow dispersing prism") so, I had them made in China for ~$100 each. The hypotenuse face is 50mm x 50mm and un-coated (this face matches the grating size). The entrance face is anti reflection coated. I use an index matching grease to couple the grating to the prism (optical epoxy would be better). I would think that you could market such a grism assembly for ~$600-$900 maybe more......given that the component parts would cost ~$300 or so. Just having a high dispersion material (ZF1 or SF2) 30 60 90 prism would be very useful for those who would want to make the grism. A short tutorial could be made to demonstrate the principle of the grism...
Poster: cdaly
Posted Date: 2013-10-10 16:08:00.0
Response from Chris at Thorlabs: Thank you for your feedback. We greatly appreciate you suggestion, which I will share with our optical engineers. I will contact you directly to discuss this further.
Poster: tcohen
Posted Date: 2012-11-13 17:47:00.0
Response from Tim at Thorlabs: Gratings are very easily damaged on contact. They should be handled only on the sides and stored in the supplied case when not in use which suspends the grating. Cleaning should only be attempted by lightly blowing off dust with clean, dry air or nitrogen.
Poster: mathieu.perrin
Posted Date: 2012-11-13 07:54:29.123
Hello, I own the 830 mm-1 transmission grating. Can it be cleaned and how?
Poster: tcohen
Posted Date: 2012-06-15 11:20:00.0
Response from Tim at Thorlabs: Thank you for your feedback! We are adding a photo to the overview tab explaining what the arrows are and we are revising our diagrams in our grating tutorial. We will also link the tutorial to this page and I have contacted you with this information on using your grating.
Poster: jcanseco
Posted Date: 2012-06-11 01:07:45.0
On the side surface of the grating, there is a long arrow. I assume this indicates the direction of the grating blaze. Do I have align the input beam in the same direction as arrow, or opposite to the arrow? In other words, should the propagation direction of the input beam follow the direction that the arrow is pointing at or go against it? Thank you.
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300 Grooves/mm Visible Transmission Gratings
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal/Imperial Price Available / Ships
GT13-03 Support Documentation
GT13-03 Vis Trans Grating, 300 Grooves/mm, 17.5° Blaze Angle, 12.7 mm x 12.7 mm
$74.97
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GT25-03 Support Documentation
GT25-03 Vis Trans Grating, 300 Grooves/mm, 17.5° Blaze Angle, 25 mm x 25 mm
$104.90
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GT50-03 Support Documentation
GT50-03 Vis Trans Grating, 300 Grooves/mm, 17.5° Blaze Angle, 50 mm x 50 mm
$194.99
3-5 Days
600 Grooves/mm Visible Transmission Gratings
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal/Imperial Price Available / Ships
GT13-06V Support Documentation
GT13-06V Vis Trans Grating, 600 Grooves/mm, 28.7° Blaze Angle, 12.7 mm x 12.7 mm
$74.97
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GT25-06V Support Documentation
GT25-06V Vis Trans Grating, 600 Grooves/mm, 28.7° Blaze Angle, 25 mm x 25 mm
$104.90
Today
GT50-06V Support Documentation
GT50-06V Vis Trans Grating, 600 Grooves/mm, 28.7° Blaze Angle, 50 mm x 50 mm
$194.99
Today
830 Grooves/mm Visible Transmission Gratings
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal/Imperial Price Available / Ships
GT13-08 Support Documentation
GT13-08 Vis Trans Grating, 830 Grooves/mm, 29.87° Blaze Angle, 12.7 mm x 12.7 mm
$74.97
Today
GT25-08 Support Documentation
GT25-08 Vis Trans Grating, 830 Grooves/mm, 29.87° Blaze Angle, 25 mm x 25 mm
$104.90
Today
GT50-08 Support Documentation
GT50-08 Vis Trans Grating, 830 Grooves/mm, 29.87° Blaze Angle, 50 mm x 50 mm
$194.99
Today
1200 Grooves/mm Visible Transmission Gratings
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal/Imperial Price Available / Ships
GT13-12 Support Documentation
GT13-12 Vis Trans Grating, 1200 Grooves/mm, 36.9° Blaze Angle, 12.7 mm x 12.7 mm
$74.97
Today
GT25-12 Support Documentation
GT25-12 Vis Trans Grating, 1200 Grooves/mm, 36.9° Blaze Angle, 25 mm x 25 mm
$104.90
Today
GT50-12 Support Documentation
GT50-12 Vis Trans Grating, 1200 Grooves/mm, 36.9° Blaze Angle, 50 mm x 50 mm
$194.99
Today
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