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Question

Diffraction grating line frequency

  • February 13, 2025
  • 3 replies
  • 29 views

AsafPe

Hi,

I ordered a Blazed (Ruled) Grating and datasheet specify 1200 Grooves/mm

What is the Lines/um I should use in for the Diffraction grating surface to simulate that? 

Thanks

3 replies

David.Nguyen
Luminary
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  • Luminary
  • 1112 replies
  • February 13, 2025

@AsafPe 

 

If one groove is one line (reasonable?), then 1 200 / 1 000 = 1.2 lines/um?

Take care,

 

David


AsafPe
  • Author
  • Monochrome
  • 4 replies
  • February 13, 2025

Thank you  David, that’s what I thought but it doesn’t fit with the diffraction orders angle. It looks like there is a factor of 0.5 missing (0.6 lines/um) like one groove which is also the grooves pitch, is half a “line” ???


David.Nguyen
Luminary
Forum|alt.badge.img+2
  • Luminary
  • 1112 replies
  • February 13, 2025

@AsafPe 

 

I would ask your manufacturer to clarify what a groove is.

OpticStudio uses this definition:

Which seem to agree with this Wikipedia figure from the Diffraction Grating article:

The refractive indices in the Wikipedia formula were omitted:

The sign difference is due to the different case treated: reflection in Wikipedia and (probably) transmission in OpticStudio Help File.

I hope this helps.

Take care,


David


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