title: Efficient Raman frequency conversion by coherent feedback at low light intensity.
abstract: We experimentally demonstrate efficient Raman conversion to respective Stokes and anti-Stokes fields in both pulsed and continuous modes with a Rb-87 atomic vapor cell. The conversion efficiency is about 40-50% for the Stokes field and 20-30% for the anti-Stokes field, respectively. This efficient conversion process is realized with coherent feedback of both the Raman pump and the frequency-converted fields (Stokes or anti-Stokes). The experimental setup is simple and can be applied easily to produce light sources with larger frequency shifts using other Raman media with long coherence time. They may have potential applications in nonlinear optics, Raman spectroscopy and precision measurement.
authors.affiliation: Quantum Institute for Light and Atoms, State Key Laboratory of Precision Spectroscopy, Department of Physics, East China Normal University, Shanghai 200062, China.
authors.forename: Bing
authors.initials: B
authors.lastname: Chen
authors.forename: Kai
authors.initials: K
authors.lastname: Zhang
authors.forename: Chengling
authors.initials: C
authors.lastname: Bian
authors.forename: Cheng
authors.initials: C
authors.lastname: Qiu
authors.forename: Chun-Hua
authors.initials: CH
authors.lastname: Yuan
authors.forename: L Q
authors.initials: LQ
authors.lastname: Chen
authors.forename: Z Y
authors.initials: ZY
authors.lastname: Ou
authors.forename: Weiping
authors.initials: W
authors.lastname: Zhang
mesh_terms: D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D007834:Lasers; D013059:Spectrum Analysis, Raman / Q000295:instrumentation*