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Diffusive random laser modes under a spatiotemporal scope.

Sara García-Revilla, Joaquín Fernández, Macarena Barredo-Zuriarrain

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    This study presents a new method to analyze random laser emissions, revealing their mode structure and dynamics. The findings clarify the behavior of these unconventional lasers, particularly the role of diffusion.

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    Area of Science:

    • Optics and Photonics
    • Condensed Matter Physics
    • Materials Science

    Background:

    • Characterizing the emission output of diffusive random lasers is challenging.
    • Existing theoretical interpretations and investigated materials have not fully resolved these challenges.

    Purpose of the Study:

    • To introduce a novel mode selection method for analyzing random laser emissions.
    • To investigate the random laser behavior of Rhodamine B in a di-ureasil host.
    • To understand the influence of excitation energy on modal density.

    Main Methods:

    • Spatial filtering and ultrafast detection were employed to separate and track individual lasing modes.
    • Experimental analysis provided direct access to mode structure and dynamics.
    • Imaging measurements were used to differentiate diffusion and amplification processes.

    Main Results:

    • The study successfully separated individual lasing modes and observed their temporal evolution.
    • Clear modal relaxation oscillations and stochastic behavior of lasing modes were demonstrated.
    • The effect of excitation energy on modal density was investigated, and diffusion was identified as dominant over amplification.

    Conclusions:

    • The developed method offers direct access to the mode structure and dynamics of diffusive random lasers.
    • The findings highlight the stochastic nature and modal relaxation oscillations in these systems.
    • Diffusion plays a more significant role than amplification in the lasing mechanisms of these unconventional lasers.