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Swept-source digital holography to reconstruct tomographic images.

Gyanendra Sheoran1, Satish Dubey, Arun Anand

  • 1Laser Applications and Holography Laboratory, Instrument Design Development Centre, Indian Institute of Technology Delhi, Hauz Khas, New Delhi-110 016, India.

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This study introduces a novel swept-source digital holography method using a superluminescent diode and acousto-optic tunable filter for enhanced axial resolution in tomographic imaging.

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Area of Science:

  • Optics and Photonics
  • Digital Imaging
  • Holography

Background:

  • Digital holography (DH) is a powerful imaging technique.
  • Achieving high axial resolution in DH is crucial for many applications.
  • Existing swept-source methods often rely on mechanical tuning, limiting speed and stability.

Purpose of the Study:

  • To develop a new swept-source digital holography system.
  • To improve axial resolution and range in tomographic imaging.
  • To demonstrate a mechanically stable and electronically tunable frequency source.

Main Methods:

  • Utilized a superluminescent diode (SLD) as a broadband light source.
  • Employed an acousto-optic tunable filter (AOTF) for electronic wavelength tuning (800-870 nm).
  • Applied the angular spectrum approach for image reconstruction at each wavelength.

Main Results:

  • Demonstrated a swept-source system with a broad tunability range.
  • Achieved increased axial resolution and range in reconstructed tomographic images.
  • Successfully tested the system on a sample with a "B" character inscription.

Conclusions:

  • The proposed SLD-AOTF swept-source system offers a viable alternative for high-resolution digital holography.
  • Electronic tuning via AOTF eliminates mechanical movement, enhancing system stability.
  • This method holds promise for advanced 3D imaging applications requiring superior axial detail.