US 12,259,552 B2
Spatial variance along waveguide incoupler
Daniel Adema, Kitchener (CA); Timothy Paul Bodiya, Toronto (CA); and Shreyas Potnis, Kitchener (CA)
Assigned to GOOGLE LLC, Mountain View, CA (US)
Filed by GOOGLE LLC, Mountain View, CA (US)
Filed on Dec. 16, 2021, as Appl. No. 17/552,721.
Claims priority of provisional application 63/126,624, filed on Dec. 17, 2020.
Prior Publication US 2022/0197035 A1, Jun. 23, 2022
Int. Cl. G02B 27/01 (2006.01); F21V 8/00 (2006.01)
CPC G02B 27/0172 (2013.01) [G02B 6/0016 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A system comprising:
an optical scanner;
an optical engine configured to provide light to the optical scanner; and
a waveguide comprising an incoupler configured to receive light from the optical scanner, wherein the incoupler comprises:
a plurality of features having a uniform period and varying in at least one selected from a group of spacing, angle, fill factor, and density;
a first zone having a first incoupling efficiency and including a first set of the plurality of features having a first uniform value for the at least one at least one selected from the group of spacing, angle, fill factor, and density; and
a second zone having a second incoupling efficiency and including a second set of the plurality of features having a second uniform value for the at least one selected from the group of spacing, angle, fill factor, and density;
wherein the first uniform value differs from the second uniform value; and
wherein the first incoupling efficiency is greater than the second incoupling efficiency.