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Self-induced high-speed modulation in microchip solid-state lasers with asymmetric end pumping.

Kenju Otsuka, Tsong-Shin Lim, Jing-Yuan Ko

    Optics Letters
    |November 23, 2007
    PubMed
    Summary

    Researchers achieved high-speed intensity modulation in chaotic laser pulsations using asymmetric optical confinement. This novel technique enables modulation frequencies significantly exceeding the intrinsic relaxation oscillation frequency, opening new possibilities for laser applications.

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    Area of Science:

    • Laser Physics
    • Nonlinear Optics
    • Quantum Optics

    Background:

    • Chaotic pulsations in lasers are typically limited in modulation speed by intrinsic relaxation oscillation frequencies.
    • Understanding and controlling high-speed modulation in lasers is crucial for advanced optical applications.
    • Previous studies have explored modulation techniques but often face limitations in achievable frequencies.

    Purpose of the Study:

    • To investigate high-speed intensity modulation of chaotic pulsations in a multimode Nd:YVO(4) laser.
    • To explore the role of asymmetric optical confinement and modal interference in achieving high modulation frequencies.
    • To numerically reproduce observed chaotic dynamics and high-speed modulation phenomena.

    Main Methods:

    • Utilized laser-diode sheetlike end pumping for a multimode Neodymium-doped Yttrium Orthovanadate (Nd:YVO(4)) laser.

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  • Investigated asymmetric optical confinement to induce modal interference and oval-hollow-mode operation.
  • Employed model equations incorporating nonlinear gain coupling and intermodal field interference for numerical simulations.

    • Main Results:

    • Observed high-speed intensity modulation exceeding 400 MHz in chaotic pulsations near 1 MHz.
    • Identified modulation frequencies as beat frequencies between closely spaced lasing modes.
    • Demonstrated that asymmetric confinement leads to oval-hollow-mode operation, enabling modulation frequencies two orders of magnitude higher than the relaxation oscillation frequency.
    • Achieved good numerical reproduction of chaotic pulsations and high-speed modulation using advanced theoretical models.
    • Successfully demonstrated high-speed pulsations in nonchaotic laser regimes as well.

    Conclusions:

    • Asymmetric optical confinement is a key mechanism for achieving ultra-high-speed modulation in chaotic lasers.
    • Modal interference, driven by asymmetric confinement, plays a critical role in generating high-frequency modulation beats.
    • The developed numerical models accurately capture the complex dynamics of chaotic laser pulsations and their modulation, validating the underlying physics.