A phonon laser operating at an exceptional point

Phys.org  July 20, 2018
Exceptional points (EP) are singularities in the energy functions of a physical system at which two light modes coalesce to produce unusual effects. Understanding the mechanisms responsible for linewidth broadening will enable laser resources with new capabilities. An international of researchers led by the US used an optomechanical system with two coupled silica whispering-gallery-mode microresonators to exploit the interplay between gain and loss to tune a phonon laser to an EP. The team provided direct experimental evidence to show complete overlap of optical supermodes at EP, and that EP-enhanced optical noise can be transferred directly to mechanical noise, leading to the observed linewidth broadening in phonon lasers. The findings have potential applications in signal processing technologies, fully integrated photonic devices for information processing and further the study of EPs in two-level or multi-level systems… read more.
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Schematic diagram of phonon lasing in a compound resonator system. Credit: Nature Photonics, nature.com/articles/s41566-018-0213-5

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