• Patent Title: Systems, devices, and methods for side lobe control in holograms
  • Application No.: US16276051
    Application Date: 2019-02-14
  • Publication No.: US11188027B2
    Publication Date: 2021-11-30
  • Inventor: Robin W. Tsen
  • Applicant: GOOGLE LLC
  • Applicant Address: US CA Mountain View
  • Assignee: GOOGLE LLC
  • Current Assignee: GOOGLE LLC
  • Current Assignee Address: US CA Mountain View
  • Main IPC: G03H1/26
  • IPC: G03H1/26 G02B27/01 G03H1/02
Systems, devices, and methods for side lobe control in holograms
Abstract:
Systems, devices, and methods for side lobe control in holograms are described. The magnitude of the side lobes of a hologram depends on the distribution of refractive index modulation (Δn), therefore control of side lobe magnitude may be achieved by controlling the distribution of Δn. The distribution of Δn may be controlled by replicating a hologram from a master with two reference beams, where the wavelength and angle of each reference beam, the playback angle of the master hologram, and the thickness of the master hologram, the copy holographic recording medium (HRM), and the recording substrate are carefully chosen to achieve a pattern of meta-interference within the HRM that matches the desired distribution of Δn.
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