An Etymological Dictionary of Astronomy and Astrophysics
English-French-Persian

Of, relating to, or produced using → holography; three-dimensional.

→ holo- + → -graphic.

A → diffraction grating produced from a series of constructive → interference fringes. The fringes, whose intensities vary in a sinusoidal pattern, correspond to the grooves of the grating. They are recorded on a photosensitive substrate and subsequently treated using a chemical procedure. Since the grooves are created by the interference of light, such a grating is free from the random and periodic errors present in → ruled gratings.

→ holographic; → grating.