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1800 Grooves/mm, 12.7mm Square, VIS Holographic Grating

Reflective Holographic Gratings

Reflective Holographic Gratings

Stock #43-775
£74.38
×
Qty 1-10
£74.38
Qty 11-25
£67.15
Qty 26+
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Groove Density (grooves/mm):
1800
Wavelength Range (nm):
400 - 700
Dimensions (mm):
12.7 x 12.7
Dimensional Tolerance (mm):
±0.5
Absolute Diffraction Efficiency (%):
45 - 65
Coating:
Bare Aluminum
Construction:
Holographic Grating
Substrate:
Float Glass
Thickness (mm):
6.00
Type:
Reflective Diffraction Grating
Wavelength:
VIS
RoHS:

Product Family Description

  • Groove Density up to 3600 Grooves per mm
  • Bare Aluminum Coating
  • Sinusoidal Grating Profile

Holographic gratings are formed by an interference fringe field of two laser beams whose standing wave pattern is exposed to a polished substrate coated with photoresist. Processing of the exposed medium results in a pattern of straight lines with a sinusoidal cross section.

Holographic gratings produce less stray light than ruled gratings. They can also be produced with up to 3600 grooves per millimeter for greater theoretical resolving power. Due to their sinusoidal cross section, holographic gratings cannot be easily blazed and their efficiency is usually considerably less than a comparable ruled grating. There are, however, special exceptions which should be noted. When groove spacing to wavelength ratio is near one, a holographic grating has virtually the same efficiency as the ruled version. Also, a holographic grating with 1800 grooves per millimeter has the same efficiency at 500nm as a blazed ruled grating. Holographic master gratings are replicated by a process identical to that used for ruled gratings.

Handling Gratings: Gratings require special handling, making them prone to fingerprints and aerosols. Gratings should only be handled by the edges. Before attempting to clean a grating, please contact us.

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