Abstract
We study the effect of a DC magnetic field on the phase sensitivity of a double-lambda system coupled by two laser fields, a probe and a pump. It is demonstrated that the gain and the refractive index of the probe can be controlled by either the magnetic field or the relative phase between the two laser fields. More interestingly, when the system reduces to a single-lambda system, turning on the magnetic field transforms the system from a phase-insensitive process to a phase-sensitive one. In the pulsed-probe regime, we observed switching between slow and fast light when the magnetic field or the relative phase was adjusted. Experiments using a coated 87Rb vapor cell produced results in good agreement with our numerical simulation. This work provides a novel and simple means to manipulate phase sensitive electromagnetically-induced-transparency or four-wave mixing, and could be useful for applications in quantum optics, nonlinear optics and magnetometery based on such systems.
Highlights
Quantum interference between different excitation path ways is an intriguing phenomenon in quantum optics, laser and atomic physics
An interesting category is the phase-sensitive process formed by closed-loop interactions, where the phases of the optical fields can dramatically change the steady state of the atoms and the optical susceptibility
The first order beams from the acoustic-optical modulator (AOM) were combined by another polarized beam splitter (PBS) and directed into the vapor cell
Summary
Quantum interference between different excitation path ways is an intriguing phenomenon in quantum optics, laser and atomic physics. An interesting category is the phase-sensitive process formed by closed-loop interactions, where the phases of the optical fields can dramatically change the steady state of the atoms and the optical susceptibility. There has been a large amount of work in this field since the 1980s [5, 6], and the interests boosted after the experimental demonstration of phase-sensitive EIT [7]. To the best of our knowledge, it is a tradition to use oscillating electromagnetic fields, i.e., either all optical fields [7, 15,16,17,18], or a combination of microwave fields and optical fields [19,20,21], to form a closed loop
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