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Polarization conversion in cubic Raman crystals.

Aaron McKay1, Alexander Sabella1,2, Richard P Mildren1

  • 1MQ Photonics Research Centre, Department of Physics and Astronomy Faculty of Science and Engineering, Macquarie University Sydney New South Wales 2109 Australia.

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Summary
This summary is machine-generated.

Efficiently converting unpolarized light to lower frequencies is now possible using cubic Raman crystals. This breakthrough in nonlinear optics yields a linearly polarized output, overcoming previous inefficiencies.

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Area of Science:

  • Nonlinear optics
  • Solid-state physics
  • Materials science

Background:

  • Nonlinear frequency downconversion in c(2) materials is typically inefficient for unpolarized beams.
  • Achieving simultaneous phase-matching for ordinary and extraordinary beams in the normal dispersion regime is a significant challenge.

Purpose of the Study:

  • To demonstrate an efficient method for nonlinear frequency downconversion of unpolarized beams.
  • To achieve a linearly polarized output state using cubic Raman crystals.

Main Methods:

  • Utilized cubic Raman crystals with doubly and triply degenerate (E and F type) modes.
  • Employed Mueller calculus to determine optimal crystal orientations for polarization conversion.
  • Experimentally verified the process using diamond, an F-class Raman crystal.

Main Results:

  • Achieved efficient nonlinear frequency downconversion of unpolarized beams.
  • Obtained a linearly polarized output with high polarization contrast (>23.9 dB).
  • Demonstrated near quantum-defect-limited slope efficiency.

Conclusions:

  • Cubic Raman crystals offer a viable and efficient route for nonlinear frequency downconversion of unpolarized light.
  • The developed method overcomes limitations of traditional c(2) materials.
  • This technique enables efficient generation of polarized light through nonlinear processes.