公开(公告)号：US20210356755A1

公开(公告)日：2021-11-18

申请号：US17443997

申请日：2021-07-29

Applicant: AGC Inc.

Inventor： Toshiya YONEHARA ,  Ryota MURAKAMI ,  Koichi TASHIMA ,  Kensuke ONO

IPC: G02B27/42 ,  G03B21/20

Abstract: A diffractive optical element includes a unit structure periodically arranged in a first direction and configured to diffract incident light in the first direction. The diffractive optical element has a phase pattern designed such that an angular separation between an outermost diffracted light beam and a second-outermost diffracted light beam along the first direction is smaller than the divergence angle of the incident light.