Monochromator gratings - Type IV

OEM gratings design and production capabilities

HORIBA Scientific produces a wide range of holographic master gratings from which high precision replicas are manufactured.
Using Type IV aberration-corrected monochromator gratings, a single concave grating disperses, collimates, and refocuses the light from the entrance slit onto the exit slit. Wavelength scanning is obtained through a simple rotation of the grating.
The groove spacing of these gratings is computer-optimized to produce high quality images with a minimum of astigmatism and coma, even at large numerical apertures. Compared with Czerny-Turner monochromators (equipped with one plane grating, one collimating mirror and one focusing mirror), Type IV aberration-corrected monochromator gratings provide much better light collection efficiency and signal-to-noise ratio.

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Segment: Scientific
Manufacturing Company: HORIBA France SAS
  • Replica gratings from aberration corrected master gratings
  • Holographic Master can be blazed by Ion-beam etching method for higher efficiency
  • Ideal for robust, compact and low stray light monochromators
  • Several references available some (not all are listed in the catalogue)
  • Large range of dispersion available
  • Multiple spectral range from UV to IR
  • Coating: Al or gold.

Fig. 1: Monochromator concave grating
LA: distance between the grating and the entrance slit
LB: distance between the grating and the exit slit
D: deviation angle
F/#: optical aperture

HORIBA Scientific also provides a wide range of products using these gratings: Spectrometers and Hyperspectral Cameras.

Fig. 2: Imaging Scanning Monochromator

Product Management and Quality

  • ISO 9001 and ISO 14001 certified
  • Unique traceability with laser marking
  • State-of-the-art metrology 
  • ITAR free products
  • Clean room storage of master gratings
  • RoHS / REACH compliant products

Customer Oriented and Confidentiality

  • Full confidentiality with mutual NDA
  • Blanket orders for large annual quantities
  • Long term relationship with co-designing
  • Three production facilities
  • Spectral ranges: from 190 to 10,000 nm
  • Large range of groove densities: from 100 to 2000 gr/mm
  • Diffraction efficiency optimized for UV, or Vis, or NIR
  • Radius of curvature : from 100 to 1232 mm
  • Dimensions : from 25 x 25 mm
    For customers in need of larger dimensions, HJY can record a custom-made holographic grating master specifically for replication.

Fig. 3: Typical efficiency curve* for 532 00, 1200 l/mm, 190-1050 nm

*This efficiency curve is absolute theoretical efficiency, calculated using rigorous electromagnetic theory, taking into account the true groove profiles of manufactured gratings measured with an atomic force microscope (AFM).

제품 문의

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