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High precision spectroscopic measurement using spectral hole burning technique with ultra-stable laser on Eu3+ : Y2SiO5 can be used to measure very small deformations in the crystal such as the ones arising due to quantum motion of nanoresonators. We present an experiment aiming at such high precision characterization.
We present a frequency comb-assisted experimental setup which enables us to both coherently transfer the stability and accuracy of a remote near-infrared (NIR) ultrastable laser to a mid-infrared (MIR) quantum cascade laser (QCL), and widely tune the QCL frequency for spectroscopic applications. The QCL is stabilized at the level of 2×10−15 from 1 to 100 s, with an accuracy of 10−14 after 100 s. The...
We present a frequency chain which enables to transfer coherently the stability and the accuracy of an ultrastable laser emitting at 1.54 μm to the mid-infrared region. It includes an optical frequency comb and an ultrastable 1.54 μm frequency signal, referenced to primary standards and transferred from LNE-SYRTE to LPL through an optical link. This system gives us the ability to transfer frequency...
Ultra-high-resolution spectroscopy enables to test modern theories of fundamental physics with molecules as for instance the non conservation of parity [1] or the stability of the electron-to-proton mass ratio [2]. However many of these tests rely on the availability of ultra-stable and accurate laser sources emitting in the mid-infrared (MIR) where molecules exhibit rovibrational transitions. It...
We will report on the development of optical lattice clocks at LNE-SYRTE. Two strontium and a mercury optical lattice clocks were developed over more than a decade. We will give and overview of this work, emphasizing several unique features of the clocks. We will also describe application of these clocks to fundamental physics tests and as well as work relevant to a possible redefinition of the SI...
We report new measurements and modifications for a simple, compact, Ca atomic clock at 657 nm. External measurements were made against an independent Yb lattice optical clock via a fs-laser frequency comb. These results lead to upper limits for the Ca clock instability that are competitive on short time scales with the best existing atomic standards.
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