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    Area of Science:

    • Biomedical Optics
    • Optical Imaging
    • Medical Technology

    Background:

    • Conventional optical coherence tomography (OCT) requires high-speed digitizers for real-time imaging.
    • Achieving en-face OCT imaging typically involves complex setups and high data acquisition rates.

    Purpose of the Study:

    • To develop a cost-effective and efficient method for real-time en-face OCT imaging.
    • To reduce the hardware requirements, specifically the digitizer speed, for OCT systems.

    Main Methods:

    • Utilized a double downconversion master slave OCT configuration with three interferometers.
    • Employed two active mixers to generate the analog product of photodetection signals.
    • Implemented low-cost RF switches for temporal window selection, bypassing the need for a fast digitizer.

    Main Results:

    • Successfully produced two en-face OCT images from different depths in real time.
    • Demonstrated the feasibility of using a low-cost digitizer with a significantly lower sampling rate than conventional OCT.
    • Evaluated optimal conditions for active mixers and switches to enhance downconversion efficiency.

    Conclusions:

    • The proposed double downconversion OCT method offers a simplified and economical approach to real-time en-face OCT imaging.
    • This technique reduces hardware costs by utilizing lower sampling rates and RF switches.
    • Further optimization of active mixers and switches can improve the performance of this OCT system.