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Updated: Jun 22, 2026

Wideband Optical Detector of Ultrasound for Medical Imaging Applications
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Doppler-broadened fiber-laser-based NICE-OHMS - Improved detectability.

Florian M Schmidt, Aleksandra Foltynowicz, Weiguang Ma

    Optics Express
    |June 24, 2009
    PubMed
    Summary
    This summary is machine-generated.

    Fiber-laser noise-immune cavity-enhanced optical heterodyne molecular spectrometry (NICE-OHMS) performance is enhanced. This advanced spectroscopy achieves a 4.5 ppt detection limit for acetylene (C2H2) using a high-finesse cavity.

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    Area of Science:

    • Spectroscopy
    • Laser Technology
    • Analytical Chemistry

    Background:

    • Noise-immune cavity-enhanced optical heterodyne molecular spectrometry (NICE-OHMS) is a sensitive technique.
    • Previous limitations hindered the full performance potential of fiber-laser-based NICE-OHMS.

    Purpose of the Study:

    • To improve the performance of fiber-laser-based NICE-OHMS.
    • To demonstrate Doppler-broadened detection of C2H2 and CO2 at ~1531 nm.
    • To compare different modulation techniques for optimal detection.

    Main Methods:

    • Utilized a fiber-laser system with a cavity finesse of 4800.
    • Employed frequency and wavelength modulation detection at absorption and dispersion phases.
    • Performed lineshape fitting for quantitative analysis.

    Main Results:

    • Achieved a minimum detectable absorption of 8 x 10^-11 cm^-1.
    • Demonstrated a detection limit of 4.5 ppt for C2H2 with a 0.7 s acquisition time.
    • Investigated the linear pressure dependence of signal strengths for C2H2 and CO2.

    Conclusions:

    • The technical constraints limiting previous NICE-OHMS demonstrations were successfully eliminated.
    • The optimized NICE-OHMS system offers highly sensitive molecular detection.
    • The study provides a foundation for advanced applications in gas sensing and molecular analysis.