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Related Experiment Videos

High-speed path-length scanning with a multiple-pass cavity delay line.

Pei-Lin Hsiung1, Xingde Li, Christian Chudoba

  • 1Department of Electrical Engineering and Computer Science and the Research Laboratory of Electronics, Massachusetts Institute of Technology, Building 36-345,50 Vassar Street, Cambridge, Massachusetts 01239, USA.

Applied Optics
|February 5, 2003
PubMed
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A new multiple-pass cavity scanning delay line enables high-speed measurements for optical coherence tomography and other applications. This technique achieves millimeter delays with minimal mirror movement, reducing misalignment sensitivity and enhancing imaging performance.

Area of Science:

  • Photonics and Optical Engineering
  • Interferometry and Spectroscopy
  • Biomedical Imaging Technology

Background:

  • High-speed delay scanning is crucial for applications like low-coherence interferometry, optical coherence tomography (OCT), and pump-probe spectroscopy.
  • Existing scanning delay lines often face limitations in speed, range, or sensitivity.
  • Developing advanced delay scanning techniques is essential for pushing the boundaries of these optical measurement methods.

Purpose of the Study:

  • To demonstrate a novel scanning delay line utilizing a multiple-pass cavity design.
  • To achieve high-speed delay scanning with reduced sensitivity to misalignment.
  • To validate the system's performance in real-time optical coherence tomography imaging.

Main Methods:

  • Implementation of a multiple-pass optical cavity for accumulating differential delays.

Related Experiment Videos

  • Design optimization to minimize sensitivity to optical element misalignment.
  • Integration with a Cr:forsterite laser source for high-resolution imaging.

    • Main Results:

    • Demonstrated scanning speed of 6 m/s at 2-kHz repetition rates.
    • Achieved millimeter-scale delays with only tens of micrometer mirror displacements.
    • Performed real-time optical coherence tomography imaging, capturing 500-pixel images at four frames/s.
    • Obtained axial image resolutions of 6 micrometers with 92-dB sensitivity.

    Conclusions:

    • The novel multiple-pass cavity scanning delay line offers a significant advancement in high-speed delay scanning.
    • The system effectively reduces misalignment sensitivity, enabling robust performance.
    • The demonstrated OCT imaging capabilities highlight the practical utility and high performance of this new technique.