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HORIBA Jobin Yvon has produced a wide range of holographic master gratings from which we manufacture high precision replicas.

Our replica gratings retain the advantages of our master holographic gratings:

• Perfect periodicity, plus excellent micro-rough-ness of the surface eliminates ghosts and enhances stray light rejection
• Minimal groove errors provide very high resolution
• Availability of very high groove densities: up to 5670 lines/mm

Dimensions of our high-precision replica gratings typically range from 25x25 mm up to 120x140 mm.

For customers in need of larger dimensions, HORIBA Jobin Yvon can record a custom-made holographic grating master specifically for replication.

The efficiency of a sinusoidal holographic grating is determined by the ratio of the wavelength and groove spacing l/s. In general:

• if l/s ≥ 0.8, efficiency will approach 85% in TM polarized light, and 60% in unpolarized light
• when 0.2 ≤ l/s ≤ 0.8, efficiency for unpolarized light is between 35% and 50%.
• when l/s < 0.2 maximum efficiency in unpolarized light will be approximately 35% for the UV, visible, and near IR region of the spectrum.

Holographic gratings usually exhibit a very broad spectral bandwidth.

NOTE:

These efficiency curves are absolute theoretical efficiencies, calculated using rigorous electromagnetic theory, taking into account the true groove profiles of manufactured gratings measured with an atomic force microscope (AFM).

These curves are for reference only and do not indicate grating specifications.