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Polarization control in a He-Ne laser using birefringence feedback.

Ligang Fei, Shulian Zhang, Yan Li

    Optics Express
    |June 5, 2009
    PubMed
    Summary

    Birefringence feedback in external cavities induces laser polarization flipping with hysteresis. External cavity length modulates eigenstate intensities, with phase differences affecting hysteresis loop width and duty ratios.

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    Area of Science:

    • Optics and Photonics
    • Laser Physics
    • Birefringent Cavity Dynamics

    Background:

    • Understanding laser polarization dynamics is crucial for various optical applications.
    • External optical feedback can significantly alter laser behavior.
    • Birefringence introduces unique polarization-dependent effects in optical systems.

    Purpose of the Study:

    • To investigate the polarization dynamics of a laser with weak optical feedback from a birefringence external cavity.
    • To analyze the effects of birefringence feedback on laser polarization states.
    • To explore the influence of external cavity length and phase differences on polarization behavior.

    Main Methods:

    • Theoretical modeling of laser polarization dynamics under feedback.
    • Experimental setup to introduce and control birefringence external cavity feedback.
    • Measurement of polarization states and intensities as a function of cavity parameters.

    Main Results:

    • Observed polarization flipping with hysteresis induced by birefringence feedback.
    • Demonstrated modulation of two eigenstate intensities by external cavity length.
    • Characterized variations in hysteresis loop width and eigenstate duty ratios with phase differences.
    • Identified minimal hysteresis loop width at a phase difference of π/2, leading to equal oscillation of eigenstates.

    Conclusions:

    • Birefringence in external cavities is a key factor in inducing and controlling laser polarization hysteresis.
    • External cavity length and phase differences offer tunable parameters for manipulating laser polarization dynamics.
    • Specific phase differences, like π/2, can lead to predictable and balanced polarization oscillations.