We have demonstrated enhanced nondegenerate four-wave mixing by use of a resonant probe in a double- Λ system consisting of an optically dense spectral hole–burning solid. The observed probe diffraction efficiency is ~16% in amplitude at 6 K, which is higher than for an off-resonant probe in a Λ -type scheme. We have also observed two-photon coherence line narrowing, which has potential application to high-resolution spectroscopy.
© 1999 Optical Society of America
B. S. Ham, M. S. Shahriar, and P.R. Hemmer, "Enhancement of four-wave mixing and line narrowing by use of quantum coherence in an optically dense double-Λ solid," Opt. Lett. 24, 86-88 (1999)