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Phonon laser action in a tunable two-level system.

Ivan S Grudinin1, Hansuek Lee, O Painter

  • 1Department of Applied Physics, California Institute of Technology, 1200 East California Boulevard, Pasadena, California 91125, USA.

Physical Review Letters
|April 7, 2010
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Summary
This summary is machine-generated.

Researchers created a phonon laser, analogous to an optical laser, using a microcavity system. This device amplifies mechanical vibrations, offering tunable amplification and potential for switching between phonon and photon laser behaviors.

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Area of Science:

  • Quantum Optics
  • Condensed Matter Physics
  • Acoustics

Background:

  • The development of phonon lasers, mechanical analogs to optical lasers, is a significant area of research.
  • Existing systems often lack tunability and precise control over mechanical modes.

Purpose of the Study:

  • To demonstrate a novel microcavity system functioning as a phonon laser.
  • To achieve tunable amplification of mechanical modes across a broad frequency range.
  • To explore the analogy between phonon and photon laser systems.

Main Methods:

  • Utilizing a compound microcavity coupled to a radio-frequency mechanical mode.
  • Inducing population inversion to generate gain in the mechanical system.
  • Operating the system above a specific pump power threshold to initiate laser action.

Main Results:

  • Demonstrated phonon laser action in a microcavity system, analogous to a two-level laser.
  • Achieved tunable gain spectrum for amplifying mechanical modes from radio frequency to microwave frequencies.
  • Observed phonon laser action above a pump power threshold of approximately 7 microwatts.
  • Explored the system's operation within a Brillouin scattering regime.

Conclusions:

  • The demonstrated system provides a tunable phonon laser with potential for controllable switching between phonon and photon laser regimes.
  • The findings open avenues for novel applications in quantum acoustics and optomechanics.
  • Mechanical mode cooling is also a possible outcome of this system.