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Since the advent of atom laser-cooling, trapping or cooling natural moleculeshas been a long standing and challenging goal. Here, we demonstrate a methodfor laser-trapping molecules that is radically novel in its configuration, inits underlined physical dynamics and in its outcomes. It is based onself-optically spatially-nanostructured high pressure molecular hydrogenconfined in hollow-core photonic-crystal-fibre. An acceleratingmolecular-lattice is formed by a periodic potential associated with Ramansaturation except for a 1-dimentional array of nanometer wide andstrongly-localizing sections. In these sections, molecules with a speed of aslarge as 1800 m/s are trapped, and stimulated Raman scattering in theLamb-Dicke regime occurs to generate high power forward and backward-Stokescontinuous-wave laser with sideband-resolved sub-Doppler emission spectrum. Thespectrum exhibits a central line with a sub-recoil linewidth of as low as 14kHz, more than 5 orders-of-magnitude narrower than in conventional Ramanscattering, and sidebands comprising Mollow triplet, molecularmotional-sidebands and four-wave-mixing.

Deeply-trapped molecules in self-nanostructured gas-phase material