Invention Publication
- Patent Title: REAL-TIME MONITORING OF DIFFRACTION EFFICIENCY OF VOLUME HOLOGRAPHIC ELEMENTS
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Application No.: US17997924Application Date: 2021-05-04
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Publication No.: US20230229112A1Publication Date: 2023-07-20
- Inventor: Jianbo Zhao , Benjamin Chrysler , Raymond Kostuk , Jilian Nguyen
- Applicant: Arizona Board of Regents on Behalf of the University of Arizona
- Applicant Address: US AZ Tucson
- Assignee: Arizona Board of Regents on Behalf of the University of Arizona
- Current Assignee: Arizona Board of Regents on Behalf of the University of Arizona
- Current Assignee Address: US AZ Tucson
- International Application: PCT/US2021/030675 2021.05.04
- Date entered country: 2022-11-03
- Main IPC: G03H1/04
- IPC: G03H1/04 ; G03H1/02

Abstract:
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.
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