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Image-based registration for synthetic aperture holography.

Sehoon Lim1, Kerkil Choi, Joonku Hahn

  • 1Duke University Fitzpatrick Center for Photonics and Communications Systems, Durham, North Carolina 27708, USA.

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|July 1, 2011
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Summary
This summary is machine-generated.

Synthesizing large apertures for digital holography is challenging due to scanning errors. This study demonstrates achieving near diffraction-limited resolution by compensating for these errors using a secondary sensor and image-based estimators.

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Area of Science:

  • Optics and Photonics
  • Digital Imaging Systems
  • Holographic Metrology

Background:

  • Synthesizing large pixel count apertures for digital holography typically involves scanning smaller detector arrays.
  • Registration errors (position, pitch) and phase instability are significant challenges in scanned holographic systems.
  • Achieving high resolution in scanned aperture systems requires precise characterization and compensation techniques.

Purpose of the Study:

  • To demonstrate near diffraction-limited resolution from a synthesized large aperture in digital holography.
  • To address and compensate for registration and phase instability errors inherent in scanned aperture systems.
  • To validate a method for improving resolution in scanned digital holographic systems.

Main Methods:

  • Synthesized a 63.4 mm aperture by scanning a 5.28 mm subaperture over 144 transverse positions.
  • Employed a secondary sensor to monitor phase instability.
  • Utilized image-based registration parameter estimators to correct for errors.
  • Characterized system performance and resolution at a 2 m range.

Main Results:

  • Achieved near diffraction-limited resolution from the synthesized large aperture.
  • Successfully compensated for detector array registration errors and phase instability.
  • Demonstrated a resolution of 60 μm at a 2 m range.
  • Validated the effectiveness of the secondary sensor and image-based estimators.

Conclusions:

  • The developed method effectively overcomes challenges in scanned aperture digital holography.
  • High-resolution imaging is achievable with synthesized apertures by mitigating scanning-induced errors.
  • This technique offers a viable approach for enhancing digital holographic system performance and resolution.