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How Diffraction Gratings are Produced

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OverTheTop

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Here is an old movie (1978) of how diffraction gratings are produced. It was made by our Government research organisation, the Commonwealth Scientific and Industrial Research Organisation. Master gratings are still made this way today, although some applications can use holographic gratings that are produced using laser-based optical methods.

Take particular note around 20:50 in the video where an aluminium plate has been cooled to -196degC using liquid nitrogen. A replicated grating is separated from the submaster by cooling one half, thus creating a thermally induced strain in the pair that causes the interface to shear.

FYI we typically use gratings that are ruled with approximately 48000 lines per inch.

Gratings are an important part of optical spectrometers. The company featured making atomic absorption spectrometers (just after where the grating was split in the video) is Varian Techtron. Agilent Technologies took over that company back in 2010. We still replicate gratings in exactly the same way using the same equipment that we used back then! We still make and sell AA instruments, along with a large portfolio of other optical and mass spectrometer products.
 

Cl(VII)

Chris Bender, Lab Rat
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We still make and sell AA instruments, along with a large portfolio of other optical and mass spectrometer products.
...but, no more NMRs. I’m still bitter about that one, I hate Bruker NMRs, their square pulses are square in name only. Plus after spending the last 21 years on Varian/Agilent NMRs, I’m practically a Jedi.
 

OverTheTop

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Yes, Agilent make lots of products, but NMR is no longer on that list. Do you use any other Agilent or Varian instruments?
 

Cl(VII)

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Yes, Agilent make lots of products, but NMR is no longer on that list. Do you use any other Agilent or Varian instruments?
Our HPLC-MSs are all Agilent, in my department anyway. I’ve been using Agilent GCs since they were HP GCs also. All great stuff, just the Varian thing hurt.

We even have a few Seahorses too (from before Agilent acquired them).

You guys are kinda like the Borg of scientific equipment.*

*Not intended as an insult.
 
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