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Related Experiment Video

Updated: Jun 14, 2026

Experimental Investigation of Secondary Flow Structures Downstream of a Model Type IV Stent Failure in a 180° Curved Artery Test Section
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Published on: July 19, 2016

Source flow effect on line shape.

H Mirels

    Applied Optics
    |March 24, 2010
    PubMed
    Summary
    This summary is machine-generated.

    This study analyzes how particle motion affects Doppler line shape in optical radiation. It introduces a parameter X(e) to quantify mean versus thermal motion, impacting laser power.

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    Last Updated: Jun 14, 2026

    Experimental Investigation of Secondary Flow Structures Downstream of a Model Type IV Stent Failure in a 180° Curved Artery Test Section
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    Area of Science:

    • Plasma Physics
    • Laser Physics
    • Fluid Dynamics

    Background:

    • Doppler line shape is crucial for understanding particle motion in plasmas and gases.
    • Particle motion, both mean and thermal, influences optical radiation properties.

    Purpose of the Study:

    • To evaluate the combined effect of mean and thermal particle motion on the Doppler line shape.
    • To derive expressions for gain and refractive index in a transverse flow system.

    Main Methods:

    • Analysis of optical radiation transverse to a source flow axis.
    • Consideration of the limit where the flow semi-angle squared is much less than one (θ²(e) << 1).
    • Derivation of gain and refractive index using radiation frequency and a parameter X(e).

    Main Results:

    • Expressions for gain and anomalous index of refraction were deduced.
    • The parameter X(e) was identified, representing the ratio of mean to thermal motion along the optical path.
    • A noted decrement in continuous-wave (cw) chemical laser output power due to transverse flow expansion.

    Conclusions:

    • The study provides a framework for understanding Doppler line broadening in flowing systems.
    • The derived expressions are applicable to scenarios involving both directed and random particle motion.
    • Transverse flow expansion can negatively impact laser performance.