Optical waveguides – With optical coupler – Input/output coupler
Reexamination Certificate
2007-02-20
2007-02-20
Font, Frank G. (Department: 2883)
Optical waveguides
With optical coupler
Input/output coupler
C385S011000
Reexamination Certificate
active
10843875
ABSTRACT:
A method and optical system for coupling light from an incoming light wave (WI) into a waveguiding substrate (S) arranges the light wave (WI) to interact with a diffractive in-coupling grating element or elements (IG) arranged on or embedded within the substrate (S) and arranged to couple the energy from the light wave (WI) into a waveguided light wave (WG). The polarization state of the light wave (WI) is converted after its first interaction (D1) with the in-coupling grating element/elements (IG) and before a second interaction (D2) with the grating element/elements (IG) takes place. The method minimizes any “reverse” diffractions, which would direct light back towards the front-end optics and therefore to increase the width W of the in-coupling grating/gratings (IG). Preferred embodiments include diffractive beam expanders for virtual displays.
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Font Frank G.
Fressola Alfred A.
Hughes James P.
Nokia Corporation
Ware Fressola Van Der Sluys & Adolphson LLP
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