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Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
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    Area of Science:

    • Quantum Optics
    • Laser Physics

    Background:

    • Controllable generation of non-classical light states is crucial for quantum technologies.
    • Vertical cavity surface emitting lasers (VCSELs) offer a compact and scalable platform for light generation.

    Purpose of the Study:

    • To develop highly controllable sources of thermal and super-thermal light.
    • To investigate the influence of noise and driving current on light properties.

    Main Methods:

    • Utilizing single-mode (SM) and multi-mode (MM) VCSELs driven by a noisy current above threshold.
    • Varying average driving current, noise amplitude, and bandwidth.

    Main Results:

    • Achieved robust generation of light with tunable temporal second-order intensity correlation functions up to 2.5.
    • Demonstrated control over correlation times ranging from 1 µs to 10 ns.
    • Preserved single-mode quality in SM VCSELs and near-single-mode behavior in MM VCSELs.

    Conclusions:

    • VCSELs provide a versatile platform for generating controllable thermal and super-thermal light.
    • Noise engineering in VCSELs allows for precise tuning of light statistical properties.
    • The generated light is suitable for applications requiring specific coherence properties.