Raman gas self-organizing into deep nano-trap lattice

M. Alharbi, A. Husakou, M. Chafer, B. Debord, F. Gérôme and F. Benabid ()
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M. Alharbi: GPPMM Group, XLIM Research Institute, CNRS UMR 7252, University of Limoges, Limoges 87410
A. Husakou: GPPMM Group, XLIM Research Institute, CNRS UMR 7252, University of Limoges, Limoges 87410
M. Chafer: GPPMM Group, XLIM Research Institute, CNRS UMR 7252, University of Limoges, Limoges 87410
B. Debord: GPPMM Group, XLIM Research Institute, CNRS UMR 7252, University of Limoges, Limoges 87410
F. Gérôme: GPPMM Group, XLIM Research Institute, CNRS UMR 7252, University of Limoges, Limoges 87410
F. Benabid: GPPMM Group, XLIM Research Institute, CNRS UMR 7252, University of Limoges, Limoges 87410

Nature Communications, 2016, vol. 7, issue 1, 1-9

Abstract: Abstract Trapping or cooling molecules has rallied a long-standing effort for its impact in exploring new frontiers in physics and in finding new phase of matter for quantum technologies. Here we demonstrate a system for light-trapping molecules and stimulated Raman scattering based on optically self-nanostructured molecular hydrogen in hollow-core photonic crystal fibre. A lattice is formed by a periodic and ultra-deep potential caused by a spatially modulated Raman saturation, where Raman-active molecules are strongly localized in a one-dimensional array of nanometre-wide sections. Only these trapped molecules participate in stimulated Raman scattering, generating high-power forward and backward Stokes continuous-wave laser radiation in the Lamb–Dicke regime with sub-Doppler emission spectrum. The spectrum exhibits a central line with a sub-recoil linewidth as low as ∼14 kHz, more than five orders of magnitude narrower than conventional-Raman pressure-broadened linewidth, and sidebands comprising Mollow triplet, motional sidebands and four-wave mixing.

Date: 2016
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DOI: 10.1038/ncomms12779

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