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Fast optical sampling by electronic repetition-rate tuning using a single mode-locked laser diode.

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    Optical sampling by electronic repetition-rate tuning (OSBERT) uses a single laser for fast, customizable measurements without moving parts. This technique enables precise distance measurement and has potential in metrology and microscopy.

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    Area of Science:

    • Photonics and optical engineering
    • Semiconductor laser technology
    • Interferometry

    Background:

    • Traditional optical sampling methods often require complex setups with moving parts.
    • Achieving fast scan rates and customizable scan ranges simultaneously presents a significant challenge in optical metrology.

    Purpose of the Study:

    • To introduce and demonstrate a novel single-laser optical sampling technique called OSBERT.
    • To showcase the capability of OSBERT for fast and precise distance measurements.

    Main Methods:

    • Utilizing electronic modulation of the repetition rate of a passively mode-locked laser diode via reverse bias.
    • Implementing a highly imbalanced interferometer to generate controlled pump-probe pulse delays.
    • Applying the OSBERT technique to a distance measurement task.

    Main Results:

    • Achieved a real-time scan rate of 1 kHz for optical sampling.
    • Demonstrated precise distance measurement over a 13.0 mm range with a standard deviation of approximately 0.1 mm.
    • Validated the technique from an equivalent free-space distance of 36 m.

    Conclusions:

    • OSBERT offers a no-moving-parts solution for optical sampling with tunable scan ranges and high scan rates.
    • The technique is suitable for deployment in compact, low-cost optical sampling systems.
    • Potential applications include metrology, biomedical microscopy, and sensing.