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Design Example: Underdamped Parallel RLC Circuit01:17

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Updated: May 2, 2026

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Comprehensive theoretical model for multi-harmonic dispersion-tuned mode-locking (DTML) for use in swept-source OCT.

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    A new theoretical model for multi-harmonic dispersion-tuned mode-locking (DTML) in swept-source OCT (SS-OCT) enables faster imaging. This advancement allows for high-resolution OCT imaging at nearly 1 MHz sweep rates.

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    Area of Science:

    • Optical Engineering
    • Biomedical Imaging
    • Laser Physics

    Background:

    • Swept-source optical coherence tomography (SS-OCT) is a crucial imaging modality.
    • Dispersion-tuned mode-locking (DTML) offers potential for high-speed SS-OCT.
    • Existing DTML models lack comprehensive theoretical frameworks for multi-harmonic operation.

    Purpose of the Study:

    • To present the first comprehensive theoretical model for the multi-harmonic dispersion-tuned mode-locking (DTML) regime in swept-source OCT (SS-OCT).
    • To detail the wavelength tuning principle, derive the tuning bandwidth formula, and provide scaling guidelines.
    • To compare optical field storage in single-harmonic DTML, multi-harmonic DTML, and frequency-division multiplexing (FDML) cavities.

    Main Methods:

    • Development of a comprehensive theoretical model for multi-harmonic DTML.
    • Derivation of the tuning bandwidth formula and scaling guidelines.
    • Comparative analysis of optical fields within different cavity configurations (single-harmonic DTML, multi-harmonic DTML, FDML).

    Main Results:

    • A theoretical model for multi-harmonic DTML in SS-OCT is established.
    • The model provides insights into tuning bandwidth and coherence performance trade-offs.
    • Experimental validation demonstrates OCT imaging of a fingertip and retina at a ~1 MHz sweep rate with a 30 nm tuning bandwidth.

    Conclusions:

    • The multi-harmonic DTML regime offers a viable path towards ultra-high-speed SS-OCT.
    • The theoretical model provides essential guidelines for optimizing DTML cavity designs.
    • Experimental results confirm the potential of multi-harmonic DTML for rapid, high-resolution biomedical imaging.