The humming telephone as an acoustic maser

  title={The humming telephone as an acoustic maser},
  author={L. Casperson},
  journal={Optical and Quantum Electronics},
  • L. Casperson
  • Published 1991
  • Physics
  • Optical and Quantum Electronics
Beginning more than a century ago, undamped oscillations in active electroacoustic resonators were subjected to rigorous experimental and theoretical study. Such concepts as waveguiding, mode pulling, mode hopping, and bistability, which have been rediscovered in their laser context, were all recognized and at least partially understood in the apparatus known as the humming telephone. 
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