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Simple high-coherence rapidly tunable external-cavity diode laser.

B Boggs, C Greiner, T Wang

    Optics Letters
    |December 20, 2007
    PubMed
    Summary
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    We developed a simple external-cavity diode laser for rapid, high-coherence frequency tuning. This laser achieves gigahertz tuning speeds, maintaining coherence for advanced applications.

    Area of Science:

    • Optics and Photonics
    • Laser Physics
    • High-Speed Electronics

    Background:

    • External-cavity diode lasers (ECDLs) are crucial for tunable laser sources.
    • Achieving high-speed and high-coherence tuning simultaneously remains a challenge.
    • Existing methods often compromise spectral purity for tuning speed.

    Purpose of the Study:

    • To present a novel electro-optically activated external-cavity diode laser.
    • To demonstrate high-speed, high-coherence frequency tuning capabilities.
    • To introduce a new method for characterizing phase coherence during rapid tuning.

    Main Methods:

    • Design and construction of a simple electro-optically activated ECDL.
    • High-speed frequency tuning measurements up to 23 GHz/µs.

    Related Experiment Videos

  • Coherence characterization using self-heterodyne, cross-correlation techniques.
  • Analysis of laser linewidth and chirp properties.

    • Main Results:

    • Demonstrated gigahertz frequency tuning ranges.
    • Achieved tuning speeds as high as 23 GHz/µs.
    • Observed transform-limited laser linewidth in extended observation windows (~100 µs).
    • Confirmed transform-limited frequency chirps during high-speed operation.

    Conclusions:

    • The developed ECDL offers a unique combination of speed and coherence.
    • The laser is suitable for applications requiring rapid, spectrally pure frequency sweeps.
    • The novel coherence diagnostic effectively characterizes phase coherence in dynamic laser systems.