OEM gratings design and production capabilities
HORIBA Scientific produces a wide range of holographic master gratings from which high precision replicas are manufactured.
Type I holographic concave gratings are recorded on spherical substrates, with equidistant and parallel grooves.
Their geometric optical properties are the same as classically ruled gratings and are interchangeable with them.
When used in a spectrograph, Type I holographic concave gratings are traditionally arranged on the Rowland circle (i.e., the circle defined by the grating center and the tangential radius of curvature of the grating).
ㆍ Replica gratings from master holographic gratings recorded in concave substrates
ㆍ Perfect periodicity of grooves
ㆍ Very low stray light compared to concave ruled grating
ㆍ Grating preferably used in mountings based on Rowland circle
- slit is located in a circle equal to the radius of curvature of the grating
- allow to obtain high resolution spectrograph
ㆍ Substrate materials: Pyrex, Zerodur
Fig. 1: Grating on Rowland circle
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ㆍ Groove frequencies ranging from 80 to 3400 g/mm
ㆍ Spectral ranges: from 60 to 800 nm
ㆍ Diffraction efficiency optimized for UV, or Vis, or NIR
ㆍ Radius of curvature : from 112 to 1500 mm
ㆍ Dimensions: from 30 x 30 mm
ㆍ For customers in need of larger dimensions, HJY can record a custom-made holographic grating master specifically for replication.
Fig. 2: Typical efficiency curve* for 531 06, 2400 l/mm, 200-400 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).