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Towards a single-laser-diode-pumped 15-GHz Ti:sapphire astrocomb.

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    Area of Science:

    • Astronomy and Astrophysics
    • Optical Physics

    Background:

    • Contemporary exoplanet observations require high precision, accuracy, and traceability.
    • Astrocombs provide thousands of ultra-narrow, drift-free optical frequencies essential for these observations.
    • Current astrocomb systems often depend on high-power lasers and multiple amplification stages.

    Purpose of the Study:

    • To introduce a compact and simplified astrocomb concept.
    • To reduce the complexity and cost of astrocomb technology.
    • To enable wider deployment of astrocombs for exoplanet research.

    Main Methods:

    • A single laser diode was used to pump a 1 GHz Ti:sapphire oscillator.
    • A supercontinuum spanning 600 nm to 900 nm was generated.
    • The supercontinuum was filtered to produce a spectrum with 15 GHz mode spacing between 730 nm and 880 nm.

    Main Results:

    • A compact and simple astrocomb prototype was successfully demonstrated.
    • The generated spectrum meets the prerequisites for astrocomb application.
    • The system utilizes a single laser diode, reducing complexity compared to existing methods.

    Conclusions:

    • This simplified astrocomb approach offers a low-cost solution for exoplanet research.
    • Widespread adoption of these systems could facilitate a network of high-resolution spectrographs.
    • This technology is crucial for comprehensive radial-velocity follow-ups of transiting exoplanet surveys.