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Construction and Characterization of External Cavity Diode Lasers for Atomic Physics
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Alignment-stabilized interference filter-tuned external-cavity quantum cascade laser.

Jan Kischkat, Mykhaylo P Semtsiv, Mikaela Elagin

    Optics Letters
    |December 10, 2014
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    Summary
    This summary is machine-generated.

    This study presents a highly stable external cavity quantum cascade laser (EC-QCL) using a novel retroreflector design. This advancement offers improved stability and miniaturization for mid-infrared light sources.

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    Area of Science:

    • Optics and Photonics
    • Quantum Electronics
    • Spectroscopy

    Background:

    • Quantum cascade lasers (QCLs) are crucial for mid-infrared (mid-IR) light generation.
    • External cavity QCLs (EC-QCLs) offer tunable mid-IR light but often suffer from instability.
    • Existing grating-tuned EC-QCLs require precise alignment and are susceptible to environmental disturbances.

    Purpose of the Study:

    • To demonstrate and investigate a passively alignment-stabilized EC-QCL.
    • To improve the stability and reduce spectral fluctuations in EC-QCLs.
    • To enable miniaturized, cost-effective, and robust mid-IR light sources for demanding applications.

    Main Methods:

    • Development of an EC-QCL incorporating a "cat's eye" retroreflector for passive alignment stabilization.
    • Integration of an ultra-narrowband transmissive interference filter for precise wavelength selection.
    • Experimental investigation of the laser's stability and spectral characteristics compared to conventional designs.

    Main Results:

    • The demonstrated EC-QCL exhibits stability against misalignment nearly two orders of magnitude higher than conventional grating-tuned EC-QCLs.
    • Spectral fluctuation is reduced by one order of magnitude.
    • The design allows for a lightweight, fail-safe construction with potential for significant miniaturization and cost reduction.

    Conclusions:

    • The passively alignment-stabilized EC-QCL offers superior stability and robustness.
    • This technology is well-suited for outdoor, space-based, and other demanding spectroscopic and imaging applications.
    • The developed EC-QCL represents a significant step towards affordable and reliable mid-IR light sources.