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Linear birefringence hinders Faraday effect measurements. This study demonstrates that optical anisotropy does not impede spin noise spectroscopy for uncorrelated spin fluctuations and enables spatial spin correlation measurements.

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Area of Science:

  • Optics and Photonics
  • Condensed Matter Physics
  • Quantum Optics

Background:

  • Linear birefringence in optical media complicates Faraday effect measurements.
  • Optically anisotropic materials have been excluded from Faraday-rotation-based spin noise spectroscopy.
  • Spin noise spectroscopy probes spin dynamics via fluctuations in optical rotation.

Purpose of the Study:

  • To investigate the impact of strong optical anisotropy on Faraday effect measurements.
  • To demonstrate the feasibility of spin noise spectroscopy in birefringent media.
  • To explore the potential of anisotropic materials for measuring spin correlations.

Main Methods:

  • Theoretical modeling of Faraday rotation in anisotropic media.
  • Experimental spin noise spectroscopy on Nd3+ ions in uniaxial crystals.
  • Analysis of spin fluctuation spectra in the presence of birefringence.

Main Results:

  • Strong optical anisotropy minimally affects the measurement of spatially uncorrelated spin fluctuations.
  • Birefringent media offer a novel pathway for measuring spatial spin correlations.
  • Experimental results for Nd3+ ions align with theoretical predictions.

Conclusions:

  • Spin noise spectroscopy is viable in optically anisotropic materials, overcoming previous limitations.
  • Anisotropic media enhance the capabilities of spin noise spectroscopy for probing spin correlations.
  • This work opens new avenues for studying spin dynamics in complex materials.