We present an experimental study of cw degenerate four-wave mixing (DFWM) in Doppler-broadened rubidium atoms coupled by an additional coherent field. The coupling field and the DFWM fields were arranged in a \ensuremath{\Lambda}-type configuration from the rubidium ${\mathrm{D}}_{2}$ transitions. We found that the presence of the coherent coupling field modifies the DFWM emission:mfat lower intensities of the coupling field, the DFWM emission is enhanced; at higher intensities of the coupling field, the DFWM is reduced. The observed effect of the coupling laser on the DFWM emission may be explained by the direct competition between the resonance-enhanced two-photon Raman scattering and the optical-pumping-enhanced DFWM emission.We present an experimental study of cw degenerate four-wave mixing (DFWM) in Doppler-broadened rubidium atoms coupled by an additional coherent field. The coupling field and the DFWM fields were arranged in a \ensuremath{\Lambda}-type configuration from the rubidium ${\mathrm{D}}_{2}$ transitions. We found that the presence of the coherent coupling field modifies the DFWM emission:mfat lower intensities of the coupling field, the DFWM emission is enhanced; at higher intensities of the coupling field, the DFWM is reduced. The observed effect of the coupling laser on the DFWM emission may be explained by the direct competition between the resonance-enhanced two-photon Raman scattering and the optical-pumping-enhanced DFWM emission.

Physical Review AJan 1, 19975 citations

Studies of degenerate four-wave mixing in atomic and molecular systems (A)

Richard C. Lind, Duncan G. Steel, Juan Francisco Lam +2 more

Journal of the Optical Society of America AJun 1, 19805 citations

Analytical study of four-wave mixing with large atomic coherence

E.A. Korsunsky, Thomas Halfmann, J.P. Marangos +1 more

arXiv:quant-ph/0209161The European Physical Journal DApr 1, 200323 citations

Atomic coherence effects in resonant degenerate four-wave mixing

Jenny Lam, Duncan G. Steel, R. A. McFarlane +1 more

We present a study of atomic coherence effects in resonant degenerate four-wave mixing. We find for energy levels having magnetic degeneracies, the third-order nonlinear response resulting from two counterpropagating pump waves orthogonally polarized to an incident probe wave generates a signal whose polarization is phase conjugate to that of the incident probe wave. This effect is due to the coupling of different magnetic states resulting from coherent excitation giving rise to a net electric quadrupole. Experimental studies in Na on the D2 line at 5890 Å confirm the analysis.We present a study of atomic coherence effects in resonant degenerate four-wave mixing. We find for energy levels having magnetic degeneracies, the third-order nonlinear response resulting from two counterpropagating pump waves orthogonally polarized to an incident probe wave generates a signal whose polarization is phase conjugate to that of the incident probe wave. This effect is due to the coupling of different magnetic states resulting from coherent excitation giving rise to a net electric quadrupole. Experimental studies in Na on the D2 line at 5890 Å confirm the analysis.

Applied Physics LettersJun 15, 198139 citations

Fundamental studies of degenerate four -wave mixing in a two-level atomic system

Binh Trong

Jan 1, 20030 citations

{\mathrm{D}}_{2}

transitions. We found that the presence of the coherent coupling field modifies the DFWM emission:mfat lower intensities of the coupling field, the DFWM emission is enhanced; at higher intensities of the coupling field, the DFWM is reduced. The observed effect of the coupling laser on the DFWM emission may be explained by the direct competition between the resonance-enhanced two-photon Raman scattering and the optical-pumping-enhanced DFWM emission.