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Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
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Published on: January 28, 2019

Vectoral air lasing with arbitrary azimuthal angle.

Zhichang Wang, Jingsong Gao, Haicheng Mei

    Optics Express
    |June 11, 2026
    PubMed
    Summary
    This summary is machine-generated.

    Researchers generated nitrogen ion lasing with vector polarization using femtosecond laser pulses. This vectorial air lasing technique transfers polarization properties and offers new insights into optical gain anisotropy.

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    Area of Science:

    • Physics
    • Optics
    • Laser Science

    Background:

    • Femtosecond laser pulses can induce nonlinear phenomena in gases.
    • Vector polarization of light offers unique properties for light-matter interactions.
    • Air lasing, or laser emission from atmospheric gases, is an area of active research.

    Purpose of the Study:

    • To demonstrate the generation of nitrogen ion lasing with controlled vector polarization.
    • To investigate the transfer of polarization properties from pump pulses to lasing emission.
    • To explore the underlying mechanisms of polarization effects in air lasing.

    Main Methods:

    • Utilizing femtosecond vector pulses to pump nitrogen gas.
    • Generating nitrogen ion lasing at 391.4 nm with cylindrical vector polarization.
    • Employing external linear polarization seed pulses to influence lasing emission.
    • Conducting simulations to validate experimental observations.

    Main Results:

    • Successfully generated nitrogen ion lasing at 391.4 nm with tunable vector polarization.
    • Demonstrated that lasing emission retains the vector polarization of the pump pulse, even with external seeding.
    • Observed and simulated optical gain anisotropy due to nitrogen cation alignment by the pump pulse.

    Conclusions:

    • The study presents a simple scheme for generating vectorial air lasing.
    • The findings highlight the significant role of optical gain anisotropy in polarization transfer.
    • This work provides new insights into polarization effects in air lasing processes.