A grism (direct-vision diffraction grating) combines a diffraction grating and prism to make any order and wavelength go straight. By setting a grism into the collimating beam (necessary for an astronomical instrument to place pupil mask, filters, etc.) of an imaging instrument, it becomes possible to easily perform spectroscopic observations. The prism array is a device aimed at increasing the angular dispersion (resolving power) of a grism within the limited size of the collimating beam part of the instrument. |
ACCESS THE FULL ARTICLE
No SPIE Account? Create one
Diffraction gratings
Echelle gratings
Prisms
Optical gratings
Diffraction
Reflection gratings
Refractive index