Achromatic waveguide lenses

Details Achromatic waveguide lenses Achromatic waveguide lenses

1990-11-08

1992-01-07

Gonzalez, Frank

Optical waveguides

Integrated optical circuit

385129, G02B 610

Patent

active

050785133

ABSTRACT:
A lens in a waveguide of an integrated optical circuit is achromatized (corrected for chromatic dispersion which varies the focal length of the lens with wavelength) by forming the lens as a hybrid mode-index/diffractive doublet. The chromatic dispersion of the diffractive element cancels the dispersion of the refractive element (the mode-index lens) such that the derivative of the focal length goes to zero at the design wavelength, and significantly reduces chromatic dispersion over a substantial wavelength range. For example, a 10 mm focal length, F/5 hybrid mode-index/diffractive lens may be provided with a useable wavelength range of approximately 80 mm for typical waveguide materials.

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patent: 4993799 (1991-02-01), Stein
patent: 5007698 (1991-04-01), Sasaki et al.
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