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Megahertz all-optical swept-source optical coherence tomography based on broadband amplified optical time-stretch
Optics Letters
|February 4, 2014
Summary
We developed ultrahigh-speed optical coherence tomography (OCT) using amplified optical time-stretch (AOT). This AOT-OCT system achieves MHz A-scan rates and enhanced sensitivity for in vivo biological tissue imaging.
Area of Science:
- Biomedical Optics
- Optical Engineering
- Medical Imaging
Background:
- Optical Coherence Tomography (OCT) is crucial for non-invasive imaging.
- Existing OCT methods face limitations in speed and sensitivity.
- Swept-source OCT (SS-OCT) typically relies on mechanical wavelength tuning, limiting speed.
Purpose of the Study:
- To demonstrate an all-optical, ultrahigh-speed swept-source OCT system.
- To leverage amplified optical time-stretch (AOT) for enhanced OCT performance.
- To achieve MHz A-scan rates and improved sensitivity for in vivo imaging.
Main Methods:
- Utilized amplified optical time-stretch (AOT) for an inertia-free wavelength-swept mechanism.
- Employed group velocity dispersion to achieve ultrahigh A-scan rates.
- Integrated simultaneous broadband Raman amplification during the time-stretch process.
Main Results:
- Achieved an A-scan rate of 7.14 MHz, significantly exceeding previous OCT systems.
- Demonstrated a record-high sensitivity of >80 dB for time-stretch-based OCT.
- Obtained an axial resolution of approximately 15 μm with a broadband gain of 80 nm.
- Successfully performed in vivo OCT imaging of biological tissue.
Conclusions:
- Amplified optical time-stretch OCT (AOT-OCT) offers a viable path to practical MHz OCT.
- AOT-OCT overcomes mechanical stability concerns and speed limitations of other OCT techniques.
- This technology enables ultrahigh-speed, high-sensitivity imaging of biological tissues in vivo.
