公开(公告)号：US20240337983A1

公开(公告)日：2024-10-10

申请号：US18682607

申请日：2022-08-11

申请人： Arizona Board of Regents on Behalf of the University of Arizona

发明人： Raymond Kostuk ,  Benjamin Chrysler ,  Jianbo Zhao

IPC分类号： G03H1/04 ,  G03H1/02

CPC分类号： G03H1/0486 ,  G03H1/0248 ,  G03H2001/0439 ,  G03H2001/0491 ,  G03H2240/53

摘要： Methods, devices and systems are described that enable monitoring the diffraction efficiency of holographic material in real-time while they are being formed. One example method includes directing a reference beam and an object beam toward a holographic material for formation of a diffraction grating and blocking one of the beams for at least a portion of time during which the diffraction grating is being formed. The method further includes, upon blockage of one of the beams, based on power level measurements, determining whether or not a first diffraction efficiency is reached. If the first diffraction efficiency is reached, one of the reference or the object beams is disabled or blocked while the other beam illuminates the holographic material with a particular duty cycle. Further measurements of the diffraction efficiency are made until the final diffraction efficiency is reached.

公开(公告)号：US20230229112A1

公开(公告)日：2023-07-20

申请号：US17997924

申请日：2021-05-04

申请人： Arizona Board of Regents on Behalf of the University of Arizona

发明人： Jianbo Zhao ,  Benjamin Chrysler ,  Raymond Kostuk ,  Jilian Nguyen

IPC分类号： G03H1/04 ,  G03H1/02

CPC分类号： G03H1/0486 ,  G03H1/0248 ,  G03H1/0402 ,  G03H2240/53 ,  G03H2001/0439

摘要： Methods, devices and systems for improved fabrication and measurement of holographic elements are described. One example method includes directing a reference and an object beam toward a holographic material for formation of a diffraction grating in the holographic material, and blocking one of the reference or the object beams to prevent the beam from reaching the holographic material for at least a portion of time during which the diffraction grating is being formed. During the blockage of the beam, a power level of a diffracted beam associated with the reference or the object beam that is not being blocked is measured. Based on the measured power level, it is then determined whether a particular diffraction grating efficiency is reached. The described techniques enable real-time measurement of diffraction grating efficiency as the grating is being formed and enable improved fabrication of holographic elements hat must meet precise diffraction grating efficiency requirements.