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Entrainment and Stimulated Emission of Auto-Oscillators in an Acoustic Cavity
Journal of the Acoustical Society of America
  • Richard L. Weaver
  • Oleg I. Lobkis
  • Alexey Yamilov, Missouri University of Science and Technology

We report theory, measurements and numerical simulations on nonlinear piezoelectric ultrasonic devices with stable limit cycles. The devices are shown to exhibit behavior familiar from the theory of coupled auto-oscillators. Frequency of auto-oscillation is affected by the presence of an acoustic cavity as these spontaneously emitting devices adjust their frequency to the spectrum of the acoustic cavity. Also, the auto-oscillation is shown to be entrained by an applied field; the oscillator synchronizes to an incident wave at a frequency close to the natural frequency of the limit cycle. It is further shown that synchronization occurs here with a phase that can, depending on details, correspond to stimulated emission: the power emission from the oscillator is augmented by the incident field. These behaviors are essential to eventual design of an ultrasonic system that would consist of a number of such devices entrained to their mutual field, a system that would be an analog to a laser. A prototype laser is constructed.

National Science Foundation (U.S.)
Keywords and Phrases
  • Classical Physics,
  • General Physics
Document Type
Article - Journal
Document Version
Final Version
File Type
© 2007 Acoustical Society of America (ASA), All rights reserved.
Publication Date
Publication Date
05 Feb 2007
Citation Information
Richard L. Weaver, Oleg I. Lobkis and Alexey Yamilov. "Entrainment and Stimulated Emission of Auto-Oscillators in an Acoustic Cavity" Journal of the Acoustical Society of America (2007) ISSN: 0001-4966
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