Sub-Hertz Optomechanically-Induced Transparency

Abstract

Optical interferometers with suspended mirrors are the archetype of all current audio-frequency gravitational-wave detectors. The radiation pressure interaction between the motion of the mirror and the circulating optical field in such interferometers represents a pristine form of light-matter coupling, largely due to 30 years of effort in developing high quality optical materials with low mechanical dissipation. However, in all current suspended interferometers, the radiation pressure interaction is too weak to be useful as a resource, and too strong to be neglected. Here, we demonstrate a meter-long interferometer with suspended mirrors, of effective mass $125$ g, where the radiation pressure interaction is enhanced by strong optical pumping to realize a cooperativity of $50$. We probe this regime by observing optomechanically-induced transparency of a weak on-resonant probe. The low resonant frequency and high-Q of the mechanical oscillator allows us to demonstrate transparency windows barely $100$ mHz wide at room temperature. Together with a near-unity ($\sim 99.9\%$) out-coupling efficiency, our system saturates the theoretical delay-bandwidth product, rendering it an optical buffer capable of seconds-long storage times.

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Cited by in corpus (5)

• Selective optomechanically-induced amplification with driven oscillators
• Fractal-like mechanical resonators with soft-clamped fundamental mode
• Optomechanically induced ultraslow and ultrafast light
• Static synthetic gauge field control of double optomechanically induced transparency in a closed-contour interaction scheme
• Room temperature cavity electromechanics in the sideband-resolved regime