Custom Blazed Grating

NIL Technology can offer you high-quality, custom-made blazed gratings with very low roughness, surface roughness and small antiblaze. The blazed gratings’ pitch can be down to 200 nm and the blaze angle end grating depth can be tuned to meet the required specifications.

Blazed grating
Blazed grating

What are blazed gratings?

A blazed grating, or also called echelette grating (from French échelle = ladder) or saw-tooth gratings, is a special type of reflective or transmission diffraction grating that is optimized to achieve maximum grating efficiency in one given diffraction order. For this purpose, maximum optical power is concentrated in the desired diffraction order, while the residual power in the other orders (particularly the zeroth) is minimized. This condition can only be achieved for a single wavelength. The direction in which maximum efficiency is achieved is called the blaze angle.

Our blazed gratings - NILT uniqueness

  • All blazed parameters can be varied according to customer specifications
  • Anti-blaze can be 90° and both above and below 90°
  • Optical surface quality
  • Orientation of gratings is not linked to crystal direction. It is possible to freely mix different orientations
Mastering properties
Blaze angle
10 – 50° +/- 1.5°
150 nm and larger
Master in silicon. Replicas in mouldable materials
<2 nm
Max substrate diameter
Up to 6” (depends on parameters)

You are more than welcome to contact us if you would like to know more about blazed gratings and how we can help you.

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