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Transverse pattern morphogenesis in a CO(2) laser.

F Encinas-Sanz, J M Guerra, I Pastor

    Optics Letters
    |October 31, 2009
    PubMed
    Summary
    This summary is machine-generated.

    Gain-switched carbon dioxide (CO2) laser pulses exhibit irregular transverse patterns. These patterns, forming lasing domains, were predicted by a population inversion filamentation model, matching experimental results.

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    Area of Science:

    • Optics and Photonics
    • Laser Physics
    • Plasma Physics

    Background:

    • Transversely excited atmospheric (TEA) carbon dioxide (CO2) lasers are crucial for various applications.
    • Understanding the transverse intensity distributions in laser near fields is essential for optimizing beam quality and performance.
    • Previous studies have explored laser modes, but the dynamics of short-pulse transverse patterns in TEA CO2 lasers remain less understood.

    Purpose of the Study:

    • To investigate the transverse intensity distributions in the near field of a gain-switched TEA CO2 laser.
    • To analyze the characteristics of these patterns in both short-pulse and long-pulse modes.
    • To compare experimental findings with theoretical predictions based on population inversion filamentation.

    Main Methods:

    • Experimental measurement of near-field transverse intensity distributions during gain-switched operation (60-ns pulse width).
    • Observation of laser behavior in both short-pulse (60-ns) and long-pulse (1-μs) modes.
    • Application of a theoretical model of population inversion filamentation to predict domain size.

    Main Results:

    • Irregular and nonrepetitive transverse intensity distributions were observed in the short-pulse mode.
    • Regular and repetitive transverse patterns, with symmetry imposed by boundary conditions, were found in the long-pulse mode.
    • Short-pulse patterns formed distinct lasing domains with a mean size of 0.8 mm, consistent with theoretical predictions.

    Conclusions:

    • The study successfully characterized the transverse intensity patterns of a TEA CO2 laser under different pulse durations.
    • The formation of lasing domains in the short-pulse mode was experimentally confirmed.
    • The agreement between experimental domain size and model prediction validates the population inversion filamentation theory for these lasers.