US PATENT SUBCLASS 359 / 571
.~.~.~ Echelette or blazed grating


Current as of: June, 1999
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359 /   HD   OPTICS: SYSTEMS (INCLUDING COMMUNICATION) AND ELEMENTS

558  DF  DIFFRACTION {3}
566  DF  .~ From grating {3}
569  DF  .~.~ 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.

SEE OR SEARCH THIS CLASS, SUBCLASS:

1+, for blazed holograms.