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

Division: Diffraction Gratings for Industrial OEM and Scientific Research

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
L_A: distance between the grating and the entrance slit
L_B: 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).