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Relative intensity fluctuations of single-mode class B lasers.

Tsong-Shin Lim, Jyh-Long Chern, Kenju Otsuka

    Optics Letters
    |November 21, 2007
    PubMed
    Summary
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    This study compares laser diodes and solid-state lasers, finding key differences in their intensity fluctuations. A crucial parameter, the ratio of carrier to photon lifetimes, governs laser dynamics.

    Area of Science:

    • Laser Physics
    • Quantum Optics
    • Nonlinear Dynamics

    Background:

    • Class B lasers, including laser diodes (LD) and solid-state lasers (SSL), exhibit complex dynamics.
    • Understanding relative intensity fluctuations is crucial for laser applications.

    Purpose of the Study:

    • To investigate and compare the relative intensity fluctuations in single-mode laser diodes and microchip solid-state lasers.
    • To elucidate the underlying theoretical mechanisms governing these fluctuations.

    Main Methods:

    • Experimental examination of intensity fluctuations in LD and SSL.
    • Development of a stochastic laser model and Fokker-Planck equation approach.
    • Derivation of reduced moment equations for theoretical analysis.

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    Main Results:

    • Significant differences in fluctuation characteristics were observed between LD and SSL.
    • Close agreement between theoretical predictions and experimental results.
    • Identification of the carrier-to-photon lifetime ratio as a critical parameter.

    Conclusions:

    • The intrinsic parameter governing the ratio of carrier density (population inversion) to photon lifetimes is pivotal for laser fluctuation dynamics.
    • Theoretical models accurately predict experimental observations in class B lasers.