ABSTRACT
Diffraction gratings are usually divided according to several criteria: their geometry, their material, their efficiency behaviour, the method of their manufacturing, according to the working spectral interval, or their usage. A few examples are cited to show the complexity and lack of clarity: amplitude - phase, phase - relief, ruled - holographic - lithographic, symmetrical - blazed, transmission - reflection, concave - plane, flat-field spectrographic - operating on the Rowland circle - those for Seya-Namioka monochromators, echelettes - echelles - echelons, those for integrated optics - those for distributed feedback (DFB), lamellar - triangular - sinusoidal - trapezoidal groove shape, dielectric - metallic, masters - replicas, etc. A good example could be: Special Type of Grating Ordered for OUR Experiment and Destroyed After It.
