US 12,253,428 B2
System and method for measuring satellite ghost efficiency of diffractive lens
Yiyang Wu, Rochester, NY (US); Hsien-Hui Cheng, Woodinville, WA (US); Xuan Wang, Kirkland, WA (US); and Lu Lu, Kirkland, WA (US)
Assigned to META PLATFORMS TECHNOLOGIES, LLC, Menlo Park, CA (US)
Filed by Meta Platforms Technologies, LLC, Menlo Park, CA (US)
Filed on Dec. 21, 2022, as Appl. No. 18/086,638.
Prior Publication US 2024/0210272 A1, Jun. 27, 2024
Int. Cl. G01M 11/02 (2006.01)
CPC G01M 11/0207 (2013.01) 20 Claims
OG exemplary drawing
 
1. A system for measuring a satellite ghost efficiency of a diffractive lens, comprising:
a light source configured to output a first probing beam;
a beam tweaking assembly disposed between the light source and the diffractive lens, and configured to convert the first probing beam into a second probing beam that is a non-collimated beam, the diffractive lens diffracting the second probing beam into a plurality of diffracted beams including a first diffracted beam of a parent diffraction order and a second diffracted beam of a satellite ghost diffraction order, wherein the beam tweaking assembly includes one or more optical lenses, and an optical power of the beam tweaking assembly is adjustable; and
a detector configured to generate a beam spot pattern including a first beam spot corresponding to the first diffracted beam and a second beam spot corresponding to the second diffracted beam.