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Excess noise in intracavity laser frequency modulation

Longhi1, Laporta

  • 1Istituto Nazionale di Fisica per la Materia, Dipartimento di Fisica and CEQSE-CNR, Politecnico di Milano, Piazza Leonardo da Vinci, 32, I-20133 Milano, Italy.

Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics
|October 25, 2000
PubMed
Summary

A laser below threshold shows increased sensitivity to noise when its frequency is modulated near, but not at, resonance. This phenomenon, driven by Floquet laser modes, amplifies external noise and field fluctuations.

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Area of Science:

  • Optics and Photonics
  • Laser Physics
  • Nonlinear Dynamics

Background:

  • Lasers below threshold exhibit unique responses to external stimuli.
  • Intracavity frequency modulation is a technique used to control laser dynamics.
  • Understanding noise sensitivity is crucial for laser applications.

Purpose of the Study:

  • To theoretically investigate the response of a modulated laser below threshold to perturbations and noise.
  • To identify conditions leading to enhanced sensitivity to external noise.
  • To elucidate the underlying mechanisms responsible for noise amplification.

Main Methods:

  • Theoretical study of a laser system.
  • Analysis of the laser's response to periodic frequency modulation.

Related Experiment Videos

  • Investigation of transient and continuous noise effects.
  • Examination of Floquet laser modes and their properties.

    • Main Results:

    • The laser shows significantly enhanced sensitivity to external noise when modulation frequency is near cavity axial mode separation but detuned from resonance.
    • Large transient energy amplification of perturbations occurs in the deterministic case.
    • Field fluctuations are enhanced in the presence of continuous stochastic noise.
    • This excess noise is attributed to the nonorthogonality of Floquet laser modes.

    Conclusions:

    • Detuned resonant frequency modulation can induce a highly sensitive state in lasers below threshold.
    • Nonorthogonal Floquet modes facilitate continuous energy transfer from noise to perturbations.
    • This enhanced noise sensitivity has implications for laser stability and signal processing.