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Here we present laser based readout and control of the Brownian motion of a thin film of superfluid helium formed around an optical microresonator. Detuned laser driving allows photothermal induced laser cooling and heating, while amplitude modulation probes the nonlinear Duffing interaction.
Cavity optomechanics allows the first direct observation of superfluid thermodynamical motion. Laser cooling and strong quartic nonlinearities are both observed, enabling prospective applications in quantum engineering, precision sensing, and studies of emergent quantum phenomena.
We present a new technique for whispering gallery mode biosensing involving direct detection of the back-scattered light. This results in suppressing laser frequency noise by 27 dB, and gives an absolute sensitivity of 76 kHz.
By evanescently coupling a helium film to a high-Q optical resonator we make the first observation of superfluid helium Brownian motion. This new system has applications in quantum optomechanics, and in understanding superfluid helium properties.
We perform an investigation into the properties of Pr3+:Y2SiO5 whispering gallery mode resonators as a first step towards achieving the strong coupling regime of cavity QED with rare-earth-ion doped crystals. Direct measurement of cavity QED parameters are made using photon echoes, giving good agreement with theoretical predictions. By comparing the ions at the surface of the resonator to those in...
The properties of a Pr3+:Y2SiO5 resonator are measured as an initial step towards performing strong coupling cavity QED experiments. Using photon echoes the resonator mode volume is measured as 6.99×10−12 m3 and the ions coherence time as 68 μs.
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