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High-gain resonant nonlinear Raman scattering on trapped cold atoms within ahigh-fineness ring optical cavity is simply explained under a nonlinearopto-mechanical mechanism, and a proposal using it to detect frequency ofmicro-trap on atom chip is presented. The enhancement of scattering spectrum isdue to a coherent Raman conversion between two different cavity modes mediatedby collective vibrations of atoms through nonlinear opto-mechanical couplings.The physical conditions of this technique are roughly estimated on Rubidiumatoms, and a simple quantum analysis as well as a multi-body semiclassicalsimulation on this nonlinear Raman process is conducted.

Opto-mechanical measurement of micro-trap via nonlinear cavity enhanced Raman scattering spectrum