Method of making an optical device

Details Method of making an optical device Method of making an optical device

1991-06-26

1992-07-14

Ben, Loha

Optical: systems and elements

Methods

G02B 2700

Patent

active

051308576

ABSTRACT:
A method is disclosed for making an optical device which is adapted to diffract an incident beam of radiation to form a plurality of discrete diffracted beams of different orders. The optical device comprises two diffraction gratings which are supported on a substrate and are separated from each other by a thin film. In order to obtain the advantages of a doubly-periodic structure, the thickness of the thin film between the two gratings is very accurately controlled to be on the order of the wavelength of the incident beam of radiation.

REFERENCES:
patent: 3732363 (1973-05-01), Glenn, Jr.
patent: 4660934 (1987-04-01), Akiba et al.
patent: 4672187 (1987-06-01), Fujita et al.
"A High Density Type Grating for Magneto-Optical Disk Head", Journal of Applied Physics, vol. 28, Supplement 28-3 pp. 193-195, 1989.
"Rigorous Analysis of Guided Waves in Doubly Periodic Structures", Journal Optical Society of America, A7, 1448 (1990).

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