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(11)

EP 4 133 321 A1

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(43) Date of publication: 15.02.2023 Bulletin 2023/07 (21) Application number: 21723905.2 (22) Date of filing: 07.04.2021

(51) International Patent Classification (IPC):  G02B 7/00(1968.09) G02B 7/198(1990.01) G02B 7/182(1990.01) H01S 3/08(1968.09) (52) Cooperative Patent Classification (CPC): G02B 7/005; G02B 7/1828; G02B 7/198 (86) International application number: PCT/IB2021/052884 (87) International publication number: WO 2021/205353 (14.10.2021 Gazette 2021/41)

(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: 07.04.2020 IT 202000007393 (71) Applicants: Consiglio Nazionale Delle Ricerche 00185 Roma (IT) Istituto Nazionale Di Fisica Nucleare (INFN) 00044 Frascati (RM) (IT)

(72) Inventors: MADDALONI, Pasquale 00044 Frascati (RM) (IT) AIELLO, Roberto 00185 Roma (IT) DI SARNO, Valentina 00185 Roma (IT) DE ROSA, Maurizio 00185 Roma (IT) RICCIARDI, Iolanda 00185 Roma (IT) DE NATALE, Paolo 00185 Roma (IT) (74) Representative: IP Sextant s.r.l.  Via A. Salandra, n.18 00187 Rome 00187 Rome (IT)