Achromatic mode-index elements for integrated optical systems

Details Achromatic mode-index elements for integrated optical systems Achromatic mode-index elements for integrated optical systems

1990-03-05

1990-12-25

Healy, Brian

Stock material or miscellaneous articles

Composite

Of bituminous or tarry residue

350 9611, 350 9618, 350 9634, 4284744, 428220, 252582, G02B 610, B32B 2708, F21V 900

Patent

active

049797883

ABSTRACT:
Mode-index optical elements comprise an optical waveguide having a optical overlay of substantially uniform thickness. The contour of the overlay in the plane of the overlay controls the direction of propagation of radiation within the waveguide. According to the invention, mode-index optical elements are optimally achromatized (i.e., rendered as insensitive as possible to radiation wavelength changes) over a desired wavelength rqange by properly selecting the respective thicknesses and bulk refractive indices of the overlay and waveguide components. Specifically, such parameters are chosen so that, for a given waveguide substrate (e.g., quartz) and superstrate (e.g., air), the deviation of the ratio of the respective effective refractive indices of the waveguide element (N.sub.E) and waveguide material (N.sub.WG) from a mean or nominal value is minimized over the desired wavelength range of achromatization.

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R. Ulrich and R. J. Martin, Applied Optics, vol. 10, No. 9, p. 2077 (1971).
D. W. Hewak and J. W. Y. Lit, Applied Optics, vol. 26, No. 5, p. 833 (1987).

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