Method for fabrication of low efficiency diffraction gratings an

Details Method for fabrication of low efficiency diffraction gratings an Method for fabrication of low efficiency diffraction gratings an

1987-12-22

1989-05-09

Arnold, Bruce Y.

350171, 350320, G02B 518, G02B 2744

Patent

active

048283568

ABSTRACT:
A reflector and method for fabricating diffraction gratings in reflectors comprises the steps of placing one or more layers (38, 56-64) of a dielectric reflective enhancing material on a reflective surface (34, 54), and forming grooves (40, 66) only in the top layer (38, 64) of the dielectric material to form the gratings. Precise control of the efficiency is obtained by decreasing the thickness (b', b") of the grooved layer and adjusting the ratio (b'/b") of the material under the grooves and adjacent to the grooves.

REFERENCES:
patent: 4281894 (1981-08-01), Guha

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