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We developed a faster spectral-domain quantum optical coherence tomography (SD-QOCT) without mechanical scanning. This breakthrough enables rapid imaging of multilayer samples, advancing biomedical applications.

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Area of Science:

  • Optics and Photonics
  • Biomedical Imaging
  • Quantum Technology

Background:

  • Spectral-domain quantum optical coherence tomography (SD-QOCT) offers high-resolution imaging.
  • Traditional SD-QOCT systems often rely on mechanical scanning, limiting acquisition speed.
  • There is a need for faster, non-mechanical SD-QOCT methods for real-time biomedical applications.

Purpose of the Study:

  • To report an optimized, high-speed implementation of SD-QOCT.
  • To demonstrate a novel system capable of acquiring axial scans (A-scans) without mechanical scanning.
  • To assess the feasibility of SD-QOCT for practical biomedical imaging.

Main Methods:

  • Implemented a novel strategy integrating a diffraction grating, a high-resolution intensified CCD camera, and a high-flux photon-pair source (VIS-NIR, ≈800 nm).
  • Enabled acquisition of the entire marginal SD-QOCT interferogram in a single camera exposure.
  • Achieved transverse A-scan acquisition without mechanical scanning.

Main Results:

  • Demonstrated a record acquisition time of 100 ms for a mirror sample and 10 s for a glass coverslip.
  • Achieved a penetration depth of approximately 4 mm.
  • Observed excellent agreement between measured interferometric response and theoretical models.

Conclusions:

  • The developed SD-QOCT system achieves unprecedented speed without mechanical scanning.
  • This optimized implementation represents a significant advancement toward practical SD-QOCT deployment.
  • The technology shows promise as a competitive imaging modality for biomedical applications.