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Tuning the phase sensitivity of a double-lambda system with a static magnetic field.
Xiwei Xu1, Shuo Shen, Yanhong Xiao
1Department of Physics, State Key Laboratory of Surface Physics, and Key Laboratory of Micro and Nano Photonic Structures Ministry of Education, Fudan University, Shanghai 200433, China.
Optics Express
|June 6, 2013
Summary
A DC magnetic field controls phase sensitivity in double-lambda systems, enabling manipulation of gain and refractive index. This research offers new methods for quantum and nonlinear optics applications.
Area of Science:
- Atomic, Molecular, and Optical Physics
- Quantum Optics
- Nonlinear Optics
Background:
- Electromagnetically induced transparency (EIT) and four-wave mixing (FWM) are crucial quantum optical phenomena.
- Phase sensitivity in these systems is key for applications but often difficult to control.
- Lambda systems provide a versatile platform for exploring light-matter interactions.
Purpose of the Study:
- To investigate the influence of a DC magnetic field on the phase sensitivity of a double-lambda system.
- To explore the control of gain and refractive index using magnetic fields and laser phase.
- To demonstrate the transformation from phase-insensitive to phase-sensitive processes and observe slow/fast light switching.
Main Methods:
- Theoretical study of a double-lambda system interacting with probe and pump laser fields.
- Numerical simulations to analyze system response to DC magnetic fields.
- Experimental verification using a coated Rubidium-87 (⁸⁷Rb) vapor cell.
Main Results:
- DC magnetic field and relative laser phase effectively control probe gain and refractive index.
- A magnetic field induces phase sensitivity in a single-lambda system, previously phase-insensitive.
- Switching between slow and fast light regimes was observed by adjusting the magnetic field or laser phase.
Conclusions:
- A DC magnetic field offers a novel and simple method to manipulate phase-sensitive EIT and FWM.
- The findings have potential applications in quantum optics, nonlinear optics, and magnetometry.
- Experimental results align well with numerical simulations, validating the proposed control mechanism.
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