Optical device

Details Optical device Optical device

1991-06-26

1992-12-29

Hannaher, Constantine

Optical: systems and elements

Diffraction

From grating

359575, G02B 518

Patent

active

051756471

ABSTRACT:
An optical device is disclosed for diffracting 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: 4360251 (1982-11-01), Rajchman
patent: 4672187 (1987-06-01), Fujita et al.
patent: 4765705 (1988-08-01), Seymour et al.
patent: 4828356 (1989-05-01), Hobrock et al.
patent: 4933640 (1990-06-01), Swanson et al.
"A High Density Dual 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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