Abstract

Recently a simple transmission method for phase-sensitive optical heterodyne detection of rf-induced sublevel coherence was successfully applied in dilute solids at low tem- perature.^1,2 The technique extends previous methods in optical-pumping double resonance³ and relies on a coherent Raman process being stimulated by a resonant pulsed or cw radio-frequency field and an optical field. It has been predicted² that the corresponding Raman heterodyne signal generally contains amplitude-modulation (AM) and frequency-modulation (PM) sideband contributions, where the AM is supposed to dominate in the optically resonant case and the FM in the nonresonant case.

© 1984 Optical Society of America