Diffraction GratingsSmall and Thin Type of Gratings

Standard Specifications

Grating Type Equally spaced straight-groove replica trating*1
Blank material Soda glass
Configuration of dimension Thickness : 3mm. Please refer the list of items regarding width and height.
Dimensional tolerances*2
Width(W) and hegiht (H) of rectangular blanks

Effective area Total area less a 2mm strip around the perimeter
Groove density tolerance ±0.5 grooves/mm
Relative Diffraction efficiency at Blaze wavelength λ(Litt)*3 55% min.
Diffraction wavefront accuracy (λ=632.8nm, first-order light) Within2λ
Coating (vacuum evaporation) Aluminum (Aℓ)
Scratches and digs 80-50 (in accordance with MIL-O-13830A)
  • *1: The grating grooves are formed with resin.
  • *2: The (T)3mm product has the edge chipping because it has been cut with the dicing equipment.
  • *3: Nominal blaze wavelength λB(Litt) is the wavelength of the maximum diffraction efficiency with the design in littrow mounting. No one to guarantee the wavelength of the maximum diffraction efficiency.
  • ※RoHS compliant (Directive 2011/65/EU + (EU)2015/863 on the Restriction of the Use of Certain Hazardous Substances in Electrical and Electronic Equipment)

The external appearances and specifications are subject to change without notice.

Be sure to prevent condensation as this can cause a significant deterioration of optical characteristics.

Special Specifications

1 When you need special plane gratings other than our standard, please contact us or let us know by the following Request Form.
2 Holographic gratings (HG) can also be manufactured.

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