Group velocity control in the ultraviolet domain via interacting dark-state resonances

Abstract

The propagation of a weak probe field in a laser-driven four-level atomic system is investigated. We choose mercury as our model system, where the probe transition is in the ultraviolet region. A high-resolution peak appears in the optical spectra due to the presence of interacting dark resonances. We show that this narrow peak leads to superluminal light propagation with strong absorption, and thus by itself is only of limited interest. But if in addition a weak incoherent pump field is applied to the probe transition, then the peak structure can be changed such that both sub- and superluminal light propagation or a negative group velocity can be achieved without absorption, controlled by the incoherent pumping strength.

References in corpus (8)

• Ultra-Slow Light and Enhanced Nonlinear Optical Effects in a Coherently Driven Hot Atomic Gas
• Interacting Dark Resonances: Interference Effects Induced by Coherently Altered Quantum Superpositions
• A Knob for Changing Light Propagation from Subluminal to Superluminal
• Signal velocity, causality, and quantum noise in superluminal light pulse propagation
• Phase-dependent interaction in a 4-level atomic configuration
• Light propagation through closed-loop atomic media beyond the multiphoton resonance condition
• Large negative and positive delay of optical pulses in coherently prepared dense Rb vapor with buffer gas
• Sub and Super-Luminal Propagation of Intense Pulses in Media with Saturated and Reverse Absorption

Cited by in corpus (6)

• Interacting double dark resonances in a hot atomic vapor of helium
• Tunable ultranarrow linewidth of cavity induced by interacting dark resonances
• Quantum control of dispersion in electromagnetically induced transparency via interacting dressed ground states
• Lossless anomalous dispersion and an inversionless gain doublet via dressed interacting ground states (DIGS)
• Quantum control of EIT dispersion via atomic tunneling in a double-well Bose-Einstein condensate
• Super-ultralow temperature laser cooling via interacting dark-state resonances