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Wideband Optical Detector of Ultrasound for Medical Imaging Applications
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Optical power detector with broad spectral coverage, high detectivity, and large dynamic range.

Jussi Rossi, Juho Uotila, Sucheta Sharma

    Optics Letters
    |April 1, 2022
    PubMed
    Summary

    We developed a versatile optical power detector using the photoacoustic effect. This device offers broad spectral coverage and a wide dynamic range for accurate light power measurements.

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    Area of Science:

    • Optics and Photonics
    • Acoustics
    • Transducer Technology

    Background:

    • Optical power measurement is crucial across diverse light-based technologies.
    • Existing detectors often have limitations in spectral range or dynamic range.
    • A need exists for a general-purpose, wide-spectrum optical power detector.

    Purpose of the Study:

    • To introduce a novel optical power detector based on the photoacoustic effect.
    • To demonstrate its broad spectral coverage and wide linear dynamic range.
    • To establish a versatile tool for optical power metrology.

    Main Methods:

    • Utilizing the photoacoustic effect: incident optical power generates an acoustic signal.
    • Employing a black absorber to efficiently convert light to heat.
    • Converting the acoustic signal to an electrical signal via a silicon-cantilever pressure transducer.

    Main Results:

    • Achieved exceptionally broad spectral coverage from ultraviolet to far-infrared, with potential for terahertz extension.
    • Demonstrated a linear dynamic range of 80 dB.
    • Established a noise-equivalent power of 6 nW/Hz and a maximum measurable power of 600 mW.

    Conclusions:

    • The photoacoustic optical power detector offers a general-purpose solution for light measurement.
    • Its wide spectral coverage and dynamic range make it suitable for various applications.
    • This technology advances optical metrology with a robust and versatile detector.