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Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
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Parametric oscillation in sodium vapor by using an external cavity.

Junji Okuma1, Nobuhito Hayashi, Akihiko Fujisawa

  • 1Graduate School of Science and Technology, Kumamoto University, Kumamoto, Japan.

Optics Letters
|March 3, 2009
PubMed
Summary

Parametric oscillation was achieved in sodium atomic vapor using an external cavity, yielding high output power and conversion efficiency. The generated signal and idler waves showed strong temporal correlations.

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Area of Science:

  • Atomic Physics
  • Quantum Optics
  • Nonlinear Optics

Background:

  • Parametric oscillation is a nonlinear optical process.
  • External cavities enhance nonlinear interactions.
  • Atomic vapors offer unique resonant properties.

Purpose of the Study:

  • To demonstrate parametric oscillation in sodium atomic vapor.
  • To investigate the performance of an external cavity setup for this process.
  • To analyze the characteristics of the generated signal and idler waves.

Main Methods:

  • Utilizing an external cavity to confine sodium atomic vapor.
  • Coupling input light to induce parametric oscillation.
  • Measuring output power, conversion efficiency, and frequency shifts.
  • Analyzing temporal correlations between signal and idler waves.

Main Results:

  • Achieved approximately 56 mW output power for both signal and idler waves.
  • Obtained a high conversion efficiency of 39% with 290 mW input power.
  • Observed frequency shifts corresponding to the Na hyperfine splitting.
  • Confirmed strong temporal correlations between the generated waves.

Conclusions:

  • External cavity enhancement enables efficient parametric oscillation in sodium vapor.
  • The generated signal and idler waves possess distinct spectral and temporal properties.
  • This work provides a foundation for applications in quantum information and spectroscopy.