公开(公告)号：US20240210272A1

公开(公告)日：2024-06-27

申请号：US18086638

申请日：2022-12-21

Applicant: Meta Platforms Technologies, LLC

Inventor： Yiyang WU ,  Hsien-Hui CHENG ,  Xuan WANG ,  Lu LU

IPC: G01M11/02

CPC classification number: G01M11/0207

Abstract: A system for measuring a satellite ghost efficiency of a diffractive lens is provided. The system includes a light source configured to output a first probing beam, and 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 diffracts 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. The beam tweaking assembly includes one or more optical lenses, and an adjustable optical power. The system also includes 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.