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Towards strain-coupled optomechanics with rare-earth doped crystals 
Friday, 21 June 2019,  2:30
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Towards strain-coupled optomechanics with rare-earth doped crystals

Signe Seidelin, Univ. Grenoble Alpes, CNRS, Institut Néel, Grenoble, France & Yann Le Coq, LNE-SYRTE, Observatoire de Paris, Université PSL, CNRS, Sorbonne Université, Paris, France

A challenge of modern physics is to investigate the quantum behavior of a bulk material object - for instance a mechanical oscillator - placed in a non-classical state. One major difficulty relies in interacting with the mechanical object without perturbing with its quantum behavior. An approach consists of exploiting a hybrid quantum system consisting of a mechanical oscillator coupled to an atom-like object, and interact via the atom-like object. A particularly appealing coupling mechanism between resonator and “atom” is based on material strain. Here, the oscillator is a bulk object containing an embedded artificial atom (dopant, quantum dot, ...) which is sensitive to mechanical strain of the surrounding material. Vibrations of the oscillator result in a time-varying strain field that modulates the energy levels of the embedded structure. We have suggested to use rare-earth doped crystals for strain-coupled systems [1] and proposed a mechanism to cool down the resonator [2]. More concretely, we are currently studying an yttrium silicate (Y2SiO5) crystal containing a triply charged europium ion (Eu3+), which is optically active. The reason behind this choice stems from the extraordinary coherence properties of this dopant, combined with its high strain-sensitivity: the Eu3+ in an Y2SiO5 matrix has an optical transition with the narrowest linewidth known for a solid-state emitter [3], and the transition is directly sensitive to strain [4]. We have succesfully fabricated mechanical resonators, designed and set up the experiment, and achieved a signal-to-noise ratio compatible with the planned measurements [5], as well as measured the strain sensitivity of europium ions in bulk Y2SiO5 crystals. Finally, the rare-earth doped crystals can also be used for laser stabilization for metrology applications, and this aspect will also be briefly discussed in the talk.
[1] K. Mølmer, Y. Le Coq and S. Seidelin, Dispersive coupling between light and a rare-earth ion doped mechanical resonator, Phys. Rev. A 94, 053804 (2016)
[2] S. Seidelin, Y. Le Coq and K. Mølmer, Rapid cooling of a strain-coupled oscillator by optical phaseshift measurement, arXiv:1905.04044 (2019)
[3] R. Yano, M. Mitsunaga, and N. Uesugi, Ultralong optical dephasing time in Eu3+:Y2SiO5, Optics Letters, 16, 1884 (1991)
[4] M. J. Thorpe et al., Frequency stabilization to 6 x10-16 via spectral-hole burning, Nature Photonics, 5, 688 (2011)
[5] O. Gobron et al., Dispersive heterodyne probing method for laser frequency stabilization based on spectral hole burning in rare-earth doped crystals, Optics Express, 25, 15539 (2017)

Location ICN2 Seminar Hall, ICN2 Building, UAB
Contact This email address is being protected from spambots. You need JavaScript enabled to view it.



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