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Phonon and photon lasing dynamics in optomechanical cavities.

Jian Xiong1,2, Zhilei Huang1,2, Kaiyu Cui1,2

  • 1Department of Electronic Engineering, Tsinghua University, Beijing 100084, China.

Fundamental Research
|June 27, 2024
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Summary

Researchers explored optomechanical cavities and found distinct mechanisms for phonon and photon lasing linewidths. An ultra-narrow phonon lasing linewidth was achieved, crucial for advanced photonic devices and applications.

Keywords:
Cavity optomechanicsLimit cycleNonlinear opticsOptomechanical CrystalPhonon lasing

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Area of Science:

  • Optomechanics
  • Photonics
  • Laser Physics

Background:

  • Lasers are essential due to their coherence, enabling fundamental research and applications.
  • Optomechanical cavities facilitate coherent interaction between photons and phonons, leading to lasing.
  • Lasing linewidths of both photons and phonons are critical parameters for practical applications.

Purpose of the Study:

  • Investigate the underlying dynamics governing photon and phonon lasing linewidths in optomechanical cavities.
  • Analyze how different physical mechanisms and decay rates influence spectral linewidths.
  • Identify conditions for achieving ultra-narrow linewidths in optomechanical systems.

Main Methods:

  • Theoretical investigation of photon-phonon interactions within an optomechanical cavity.
  • Analysis of lasing linewidths in two distinct regimes: normal and reversed.
  • Characterization of linewidth dependence on intrinsic optical and mechanical decay rates.

Main Results:

  • Identified two distinct physical mechanisms governing linewidths in normal and reversed regimes.
  • Achieved an ultra-narrow phonon lasing linewidth of 5.4 kHz at 6.22 GHz in the normal regime.
  • Demonstrated that ultra-narrow linewidths for photon lasing are unattainable in the reversed regime under tested conditions.

Conclusions:

  • The study elucidates the mechanisms behind phonon and photon lasing linewidths in optomechanical cavities.
  • Achieving ultra-narrow phonon linewidths is possible independently of pump light linewidth in the normal regime.
  • Results offer pathways for developing silicon photonic devices with tailored coherence properties for sensing, metrology, and signal processing.