.~.~ Including particular grating characteristic {7}
571
.~.~.~ Echelette or blazed grating
DEFINITION
Classification: 359/571
Echelette or blazed grating:
(under subclass 569) Subject matter wherein the diffraction grating is an echelette (sawtooth) type of grating or wherein the grating is designed for maximum intensity at a desired region of the diffraction spectrum.
(1) Note. Theoretically, the most efficient groove shape for any grating is a right triangle. The inclination of its hypote-nuse is called the blaze angle because it determines
the direction in which a diffracted beam has its greatest efficiency. Such gratings are termed blazed.
(2) Note. A blazed diffraction grating is one having properly shaped grooves to concentrate most of the energy into a single spectral order.
