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Grating Prisms (GRISMS)

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Grating Prisms (GRISMS)

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A grism (or Carpenter's prism) is formed by replicating a transmission grating onto the hypotenuse face of a right-angle prism. Grisms are useful in spectrometers that require in-line presentation of the spectrum. The light diffracted by the grating is bent back in line by the refracting effect of the prism. The dispersion of a grism is not linear, since the dispersive effects of the prism and grating are superimposed. Ray path of a grism in its usual configuration for the in-line wavelength. Light is incident normally on the back face of the prism, is refracted at the interface between the prism (glass of index n) and the resin (index nE) and then diffracted at the interface between the resin and the air.

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