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We experimentally demonstrate efficient Raman conversion to respective Stokesand anti-Stokes fields in both pulsed and continuous modes with a Rb-87 atomicvapor cell. The conversion efficiency is about 40-50% for the Stokes field and20-30% for the anti-Stokes field, respectively. This conversion process isrealized with feedback of both the Raman pump and the frequency-convertedfields (Stokes or anti-Stokes). The experimental setup is very simple and canbe applied easily to produce the light source with larger frequency differenceusing other Raman media. They may have wide applications in nonlinear optics,atomic physics, quantum optics and precise measurement.

Efficient Raman Frequency Conversion by Feedbacks of Pump and Stokes Fields