公开(公告)号：US11640043B2

公开(公告)日：2023-05-02

申请号：US17567452

申请日：2022-01-03

Applicant: US Gov't as represented by Secy of Air Force

Inventor： Joshua Lentz

IPC: G02B7/28 ,  G02F1/1335 ,  G02F1/139 ,  G02B5/04

Abstract: An optical focus control and method use rotations of a set of shift-invariant optical elements (Risley elements) that are fairly tolerant to optical misalignments and wobble in control systems. The Risley elements can be Risley prisms, Risley gratings, or photonic crystals that impart a fixed angular offset. Aligning at least one pair of Risley elements that are individually rotated can achieve an angular correct to light received off-axis for better detection by an optical detector, improving focus control.

公开(公告)号：US20220244490A1

公开(公告)日：2022-08-04

申请号：US17567452

申请日：2022-01-03

Applicant: US Gov't as represented by Secy of Air Force

Inventor： Joshua Lentz

IPC: G02B7/28 ,  G02F1/1335 ,  G02B5/04 ,  G02F1/139

Abstract: An optical focus control and method use rotations of a set of shift-invariant optical elements (Risley elements) that are fairly tolerant to optical misalignments and wobble in control systems. The Risley elements can be Risley prisms, Risley gratings, or photonic crystals that impart a fixed angular offset. Aligning at least one pair of Risley elements that are individually rotated can achieve an angular correct to light received off-axis for better detection by an optical detector, improving focus control.