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A Kerr polarization controller.

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The Kerr effect in a Fabry-Pérot resonator controls continuous wave laser polarization. Optical power converts linearly polarized light to circular polarization via symmetry breaking.

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Area of Science:

  • Nonlinear optics
  • Quantum optics
  • Laser physics

Background:

  • Kerr effect causes polarization changes in pulsed lasers, crucial for mode-locked systems.
  • Nonlinear polarization rotation is a key phenomenon in laser operation.

Purpose of the Study:

  • To demonstrate Kerr effect-based polarization control in a continuous wave laser using a Fabry-Pérot resonator.
  • To investigate the mechanism of Kerr-nonlinearity induced symmetry breaking for polarization manipulation.

Main Methods:

  • Utilizing a high-finesse Fabry-Pérot resonator with a Kerr medium.
  • Applying a continuous wave laser with controlled optical power.
  • Analyzing the output polarization state transformation.

Main Results:

  • Demonstrated all-optical polarization control of a continuous wave laser.
  • Converted linearly polarized light to left- or right-circularly polarized light, controlled by optical power.
  • Observed symmetry breaking splitting resonance frequencies of degenerate modes.

Conclusions:

  • Kerr effect in high-Q resonators enables efficient all-optical polarization control.
  • The principle is applicable to photonic integrated circuits for polarization filters and sensors.
  • Spontaneous symmetry breaking of polarization states offers novel functionalities.