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Updated: Dec 13, 2025

Stimulated Stokes and Antistokes Raman Scattering in Microspherical Whispering Gallery Mode Resonators
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Steady-state stimulated Raman generation and filamentation using complex vector vortex beams.

Henry J Meyer, Sandra Mamani, Robert R Alfano

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    Complex vector vortex beams (CVVB) show tunable stimulated Raman scattering and reduced laser filamentation in methanol. Beam properties depend on polarization and orbital angular momentum (L), offering control over nonlinear optical effects.

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    Area of Science:

    • Nonlinear Optics
    • Laser Physics
    • Quantum Optics

    Background:

    • Stimulated Raman scattering (SRS) and laser filamentation are key nonlinear optical phenomena.
    • Complex vector vortex beams (CVVB) offer unique polarization and phase properties.
    • Understanding beam-matter interactions is crucial for advanced laser applications.

    Purpose of the Study:

    • Investigate SRS and laser filamentation using nanosecond pulsed CVVBs in methanol.
    • Analyze the influence of CVVB orbital angular momentum (L) and polarization on these phenomena.
    • Determine the impact of CVVBs on beam stability and filamentation characteristics.

    Main Methods:

    • Generation of CVVBs using q-plates.
    • Experimental setup involving a 20 cm methanol cell.
    • Systematic variation of L values (1-4) and polarizations (circular, radial, azimuthal).

    Main Results:

    • SRS stability and intensity are dependent on input polarization and L value.
    • CVVBs cause the beam to break into multiple primary filaments during filamentation.
    • A reduction in small-scale filamentation was observed when using CVVBs.

    Conclusions:

    • CVVBs provide a method to control SRS and laser filamentation.
    • Polarization and L value are critical parameters for tailoring nonlinear optical responses.
    • CVVBs show potential for mitigating unwanted small-scale filamentation.