Plane Sinusoidal Holographic Diffraction Gratings

A sinusoidal grating is a diffraction grating that has a sinusoidal groove profile.

Sinusoidal groove profiles are the most common groove shape for holographic gratings. The grooves are symmetrical and therefore have no blaze direction. Diffracted energy and spectral performance is modified by changing the ratio of groove spacing and groove depth.

Typically a sinusoidal grating offers a wider spectral coverage compared to a blazed grating but has lower efficiency. However, under certain conditions where the groove spacing and wavelength ratio are close to unity, a sinusoidal grating can exhibit the same efficiency as a blazed grating, for example an 1800g/mm sinusoidal grating achieves high efficiency in the visible region (see efficiency curves).

Some special types of sinusoidal gratings also offer extremely high efficiency such as a 1740g/mm sinusoidal grating for laser chirp pulse compression where efficiencies of >90% (for Littrow incidence, S-polarisation) can be achieved.

Spectrum Scientific offers a range of standard gratings. If we do not have a grating that meets your requirement, please contact our sales department as new gratings are manufactured in a regular basis.