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Real-time high-resolution mid-infrared optical coherence tomography.

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  • 11DTU Fotonik, Technical University of Denmark, 2800 Kgs, Lyngby, Denmark.

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Researchers developed a practical mid-infrared optical coherence tomography system for deeper tissue imaging. This new system offers real-time, non-destructive testing for defect inspection and thickness measurements in challenging samples.

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Area of Science:

  • Biomedical Optics
  • Optical Engineering

Background:

  • Optical Coherence Tomography (OCT) systems benefit from longer wavelengths for improved penetration depth.
  • Mid-infrared OCT development has been hindered by component limitations, leading to slow acquisition, low sensitivity, and poor resolution.

Purpose of the Study:

  • To demonstrate a practical mid-infrared spectral-domain OCT system.
  • To achieve real-time imaging with enhanced penetration depth for specific applications.

Main Methods:

  • Developed a mid-infrared spectral-domain OCT system operating at a 4 µm central wavelength.
  • Utilized a high-brightness 0.9–4.7 µm supercontinuum source and broadband upconversion for detection with a standard spectrometer.
  • Achieved an axial resolution of 8.6 µm.

Main Results:

  • Demonstrated a mid-infrared OCT system capable of real-time 2D cross-sectional imaging.
  • The system achieved an 8.6 µm axial resolution at 4 µm wavelength.
  • Successfully compared mid-infrared OCT images with state-of-the-art near-infrared OCT.

Conclusions:

  • Presented the first practical mid-infrared OCT system.
  • The system is suitable for real-time non-destructive testing, including defect inspection and thickness measurements.
  • This technology is particularly valuable for samples with strong scattering at shorter wavelengths.