The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 22, 2022
Filed:
Jan. 13, 2020
Facebook Technologies, Llc, Menlo Park, CA (US);
Hao Yu, Redmond, WA (US);
Lu Lu, Kirkland, WA (US);
Mengfei Wang, Seattle, WA (US);
Barry David Silverstein, Kirkland, WA (US);
Meta Platforms Technologies LLC, Menlo Park, CA (US);
Abstract
A wavefront sensor for determining a wavefront of an impinging light beam includes a microlens array formed by nanoimprint lithography. Each microlens of the microlens array includes a plurality of concentric ridges separated by concentric grooves. A ratio F of a width of the concentric ridges to a pitch p of the concentric ridges is a function of a radial distance r from a microlens center to the concentric ridges. An effective refractive index n of microlenses depends on a fill ratio of a binary pattern, which depends on the radial distance from the microlens center. A photodetector array is disposed downstream of the microlens array and configured for receiving the plurality of light spots at the focal plane. An imaging optical rangefinder includes the wavefront sensor, a pulsed light source for emitting probing pulses, and a photodetector for receiving reflected light pulses.