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Related Experiment Video

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Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection
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Liquid detection with InGaAsP semiconductor lasers having multiple short external cavities.

X Zhu, D T Cassidy

    Applied Optics
    |November 25, 2010
    PubMed
    Summary
    This summary is machine-generated.

    A novel liquid detection system uses a tunable diode laser with multiple short external cavities (MSXC) for precise measurements. This system accurately quanties water concentration in acetone with high correlation and low prediction error.

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    Last Updated: Jun 6, 2026

    Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection
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    Published on: October 13, 2017

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    Construction and Characterization of External Cavity Diode Lasers for Atomic Physics
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    Published on: April 24, 2014

    Area of Science:

    • Optoelectronics
    • Spectroscopy
    • Analytical Chemistry

    Background:

    • Accurate liquid detection is crucial for various industrial and scientific applications.
    • Tunable lasers offer advantages in selectivity and sensitivity for chemical analysis.
    • Traditional methods may face challenges with sensitivity, selectivity, or complexity.

    Purpose of the Study:

    • To report a novel liquid detection system utilizing a diode laser with multiple short external cavities (MSXC).
    • To demonstrate the system's capability for quantitative analysis of liquid compositions.
    • To validate the system's performance using water concentration in acetone as a model.

    Main Methods:

    • Development of a tunable MSXC diode laser operating in single mode across 18 distinct wavelengths (72 nm range).
    • Utilized piezoelectric positioning to select specific laser modes for analysis.
    • Employed modulated injection current and phase-sensitive detection for transmission measurements, suppressing noise.
    • Applied multivariate calibration techniques, including partial least squares (PLS) and principal component regression (PCR), for data processing.

    Main Results:

    • Achieved single-mode operation tunable over a 72 nm range by adjusting external cavity length.
    • Demonstrated effective noise reduction and ambient light rejection using phase-sensitive detection.
    • Quantified water concentration in acetone with a high correlation coefficient (R² = 0.997).
    • Obtained a low root-mean-square error of prediction (RMSEP) of 0.29% for water concentration (2-19% range).

    Conclusions:

    • The MSXC diode laser system provides a robust and tunable platform for liquid detection.
    • Multivariate calibration effectively processes spectral data for accurate quantitative analysis.
    • The system shows significant potential for precise and sensitive chemical composition analysis in liquids.