(19)

(11)

EP 4 291 930 A1

(12)

(43) Date of publication: 20.12.2023 Bulletin 2023/51 (21) Application number: 22753557.2 (22) Date of filing: 10.02.2022

(51) International Patent Classification (IPC):  G02B 5/18(2006.01) G02B 5/126(2006.01) G02B 5/08(2006.01) (52) Cooperative Patent Classification (CPC): G02B 5/282 (86) International application number: PCT/US2022/070613 (87) International publication number: WO 2022/174245 (18.08.2022 Gazette 2022/33)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR Designated Extension States: BA ME Designated Validation States: KH MA MD TN (30) Priority: 10.02.2021 US 202117172979 (71) Applicant: Lawrence Livermore National Security, LLC Livermore CA 94550-9234 (US)	(72) Inventor: NGUYEN, Hoang T. Livermore, California 94550-9234 (US) (74) Representative: J A Kemp LLP  80 Turnmill Street London EC1M 5QU London EC1M 5QU (GB)