Three-level

Λ Configuration: EIT, CPT & Adiabatons

A probe field on one transition and a coupling field on the other create a dark state decoupled from the excited level. Phenomena include slow light, electromagnetically induced transparency (EIT), coherent population trapping (CPT), light storage and retrieval, and adiabatic population transfer (adiabatons).

• Λ-Type Three-Level: EIT, Slow Light and Storage
• Λ-Type Three-Level: Coherent Population Trapping (CPT)
• Λ-Type Three-Level: Adiabatons

V Configuration: Matched Pulses & Simultons

Two fields share the same excited state. When the combined pulse areas satisfy the V-system area theorem, the fields lock together into shape-preserving simulton solutions that propagate without loss.

• V-Type Three-Level: Simultons

Ladder (Ξ) Configuration: EIT, Autler-Townes & Rydberg

A probe drives the lower transition and a coupling field drives the upper transition, creating two-photon coherence between ground and top state. Phenomena include EIT, Autler-Townes dressed-state splitting, and Doppler-narrowed Rydberg EIT in thermal vapour.

• Ladder-Type Three-Level: Weak Pulse with Coupling — EIT
• Three-Level Ladder (Ξ): Autler–Townes Splitting