公开(公告)号：US20220179137A1

公开(公告)日：2022-06-09

申请号：US17594466

申请日：2020-04-17

Applicant: HORIBA FRANCE SAS

Inventor： Romain FEILLEUX ,  Amine BOUSSADI

IPC: G02B5/18

Abstract: Disclosed is a reflective diffraction grating including at least one intermediate metal layer arranged between the external reflective layer and a surface of the substrate including the grating lines, the external reflective layer being consisted of a first metal and the intermediate metal layer being consisted of another metal, the other metal having a higher electron-phonon coupling coefficient than the electron-phonon coupling coefficient of the first metal or metal alloy, the external reflective layer having a thickness in a range having a lower limit determined by a reflection coefficient of the first metal and an upper limit determined by a thermal diffusion length of the first metal, and the intermediate metal layer having another thickness greater than a minimum value in such a way as to increase the high peak power ultrashort pulse light flux resistance of the reflective diffraction grating.