-
1.发明公开公开(公告)号：US20240337983A1
公开(公告)日：2024-10-10
申请号：US18682607
申请日：2022-08-11
发明人： Raymond Kostuk , Benjamin Chrysler , Jianbo Zhao
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.
-
2.发明公开公开(公告)号：US20230244021A1
公开(公告)日：2023-08-03
申请号：US18002738
申请日：2021-06-16
摘要： Methods and systems are described that enable manufacturing of holograms with high spatial frequencies and allow composite master holograms to be formed in reflection configurations. An example system for replicating transmission-type holographic elements includes one or more prisms positioned to receive an illumination beam on a first face. A composite master holographic element is positioned in contact with a second face of the one or more prisms to receive the illumination beam after propagation through he one or more prisms. The composite master hologram includes a reference beam component and an object beam component. The replication hologram is positioned in contact with a third face of the one or more prisms to receive, upon illumination of the master HOE by the illumination beam, a holographic exposure comprising first order diffracted illumination from both the reference beam component and object beam component at an exposure region of the copy HOE.
-
公开(公告)号：US20230229112A1
公开(公告)日：2023-07-20
申请号：US17997924
申请日：2021-05-04
发明人： Jianbo Zhao , Benjamin Chrysler , Raymond Kostuk , Jilian Nguyen
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.
-
-
搜索结果
3 条记录 (耗时 0.017 秒)
