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Top Story

Vibrations at an exceptional point: New laser uses light to create sound

A team of international researchers has seen the light and now has a lasing system that produces "good vibrations." They developed a lasing system already adept at producing tiny light packets called photons into a tunable system that also makes little bits of mechanical energy called phonons -- the energy products of oscillation, or vibration. In doing so, they are the first research group to broaden what is called a laser linewidth in the phonon laser and steer it through a physical system known as the "exceptional point." Linewidth is a key component of lasing, showing the physical integrity of the lasing signal as well as the measure of usually unwanted noise in the laser. In future work, the researchers intend to study more deeply the energy exchange between the two super modes in phonon lasing and continue to seek surprises at the exceptional point.

Visit Website | Image credit: Micro/Nano Photonics Lab/Washington University in St. Louis