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Ultra-broadband mid-wave-IR upconversion detection.

Ajanta Barh, Christian Pedersen, Peter Tidemand-Lichtenberg

    Optics Letters
    |April 15, 2017
    PubMed
    Summary
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    Researchers developed a new method for detecting mid-wave-infrared (MWIR) light at room temperature. This technique uses nonlinear upconversion to efficiently convert a broad range of MWIR wavelengths into near-infrared (NIR) light for easy detection.

    Area of Science:

    • Optics and Photonics
    • Nonlinear Optics
    • Infrared Spectroscopy

    Background:

    • Mid-wave-infrared (MWIR) light detection is crucial for various applications, including thermal imaging and spectroscopy.
    • Traditional MWIR detectors often require cryogenic cooling, increasing complexity and cost.
    • Nonlinear optical techniques offer potential for novel detection schemes.

    Purpose of the Study:

    • To demonstrate efficient room-temperature detection of ultra-broadband MWIR light.
    • To achieve a flat spectral response over a wide MWIR range.
    • To utilize nonlinear upconversion for MWIR to near-infrared (NIR) signal conversion.

    Main Methods:

    • Employed a periodically poled lithium niobate (PPLN) crystal in a compact intra-cavity setup.

    Related Experiment Videos

  • Utilized a continuous-wave (CW) pump laser at 1064 nm to drive nonlinear upconversion.
  • Upconverted MWIR light (3.6–4.85 μm) to NIR wavelengths (820–870 nm).
  • Detected the upconverted NIR light using a silicon-based camera and grating spectrometer.

    • Main Results:

    • Achieved efficient room-temperature detection of MWIR light.
    • Demonstrated an almost flat spectral response over a bandwidth exceeding 1200 nm.
    • Obtained high conversion efficiency for a broad range of MWIR wavelengths.
    • Validated experimental results with analytical predictions and numerical simulations.

    Conclusions:

    • The proposed nonlinear upconversion technique enables efficient, broadband MWIR detection at room temperature.
    • The method offers a cost-effective alternative to traditional cooled MWIR detectors.
    • This approach paves the way for advanced infrared sensing applications.