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Optical injection unlocking for cavity ringdown spectroscopy.

Greg Bostrom, Andrew Rice, Dean Atkinson

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    Summary
    This summary is machine-generated.

    We demonstrate a novel pulsed optical injection technique for continuous wave cavity ringdown spectroscopy. This method rapidly shifts laser frequency, enabling 3.5 kHz ringdown events for enhanced spectroscopic analysis.

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    Area of Science:

    • Spectroscopy
    • Laser Physics
    • Cavity Ringdown Spectroscopy

    Background:

    • Continuous wave cavity ringdown spectroscopy (CW-CRDS) necessitates rapid light injection termination to initiate ringdown.
    • Existing methods for terminating light injection can be complex or introduce unwanted artifacts.

    Purpose of the Study:

    • To develop and demonstrate a new technique for rapidly terminating light injection in CW-CRDS.
    • To achieve controlled initiation of ringdown events at high frequencies.

    Main Methods:

    • Utilized pulsed optical injection of a secondary laser into the primary laser.
    • Induced frequency shifts (20-100 MHz) in the cavity-locked main laser.
    • Investigated frequency shift dependence on main laser current and relative wavelength.

    Main Results:

    • Successfully generated ringdown events at a rate of 3.5 kHz.
    • Demonstrated frequency shifts of 20-100 MHz.
    • Confirmed that the pulsed injection technique preserves single exponential decay characteristics.

    Conclusions:

    • Pulsed optical injection is an effective method for initiating ringdown events in CW-CRDS.
    • This technique offers precise control over ringdown initiation without compromising data integrity.
    • The method is suitable for high-repetition-rate CRDS applications.