Flat field and imaging 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.
Type IV aberration-corrected flat field and imaging gratings are designed to focus a spectrum onto a plane surface, making them ideal for use with linear or 2-D array detectors.
These gratings are produced with grooves that are neither equis-paced nor parallel, and are computer optimized to form near-perfect images of the entrance slit on the detector plane.

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Segment: Scientific

Division: Diffraction Gratings for Industrial OEM and Scientific Research

Manufacturing Company: HORIBA France SAS

Replica gratings from holographic 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 spectrometers
Several references available (not all are listed in the catalogue)
Large range of dispersion available (from few nm/ mm to above 100nm/mm)
Multiple spectral range from UV to IR
Coating: Al or gold.

Fig. 1: This illustration shows a “super corrected grating” imaging two independent sources onto two independent linear arrays. Spectrum 1 is a “sample spectrum” from slit 1 and spectrum 2 a reference spectrum from slit 2. These “slits” could be fiber optic inputs

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

Fig. 2: Typical implementation into a spectrograph

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 170 to 4180 nm
Average dispersion (nm/mm) : from 1 to 106 nm/mm
Diffraction efficiency optimized for UV, or Vis, or NIR
Radius of curvature : from 58 to 330 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 533 02, 285 l/mm, 190-800 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).