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Proceedings Paper

Achromatization of optical waveguide components
Author(s): Kevin E. Spaulding; G. Michael Morris
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Paper Abstract

An investigation aimed at reducing chromatic variations in the performance of optical waveguide devices is described. Methods to achromatize the characteristics of integrated optics lenses, input/output couplers, and beam-splitters are presented with the goal of eliminating, or minimizing, any performance variations over a wavelength interval at least on the order of the operating range of presently available laser diode sources. It is shown that an achromatic waveguide lens can be made using a mode-index/diffractive doublet. With this approach, it is possible to cancel the longitudinal chromatic aberrations of the refractive lens with an appropriate diffractive component. Achromatic input/output couplers are described which use an external diffraction grating to correct for the angular dispersion of either prism or grating couplers. It is shown that double grating couplers can be used to obtain an achromatic wavelength range on the order of ten nanometers, and that hybrid prism/grating couplers can yield an achromatic range of several hundred nanometers. It is also shown that the angular chromatic dispersion of waveguide grating beam-splitters can be corrected using a second grating that is appropriately specified. This permits a guided optical beam to be split into two or more separate beams whose directions are independent of wavelength. These achromatic waveguide components can be combined in various configurations to reduce the wavelength sensitivity of devices such as optical disk pickup heads.

Paper Details

Date Published: 1 September 1991
PDF: 10 pages
Proc. SPIE 1507, Holographic Optics III: Principles and Applications, (1 September 1991); doi: 10.1117/12.47027
Show Author Affiliations
Kevin E. Spaulding, Institute of Optics/Univ. of Rochester (United States)
G. Michael Morris, Institute of Optics/Univ. of Rochester (United States)

Published in SPIE Proceedings Vol. 1507:
Holographic Optics III: Principles and Applications
G. Michael Morris, Editor(s)

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