Multilevel Laser Induced Continuum Structure

TL;DR

This paper extends laser-induced continuum structure (LICS) theory to a multilevel system with degenerate states, simplifying analysis through basis rotation and deriving conditions for state trapping.

Contribution

It introduces a multilevel LICS model with degenerate states, providing a method to decouple complex systems and analyze their dynamics.

Findings

Derived a trapping condition for multilevel LICS.

Reduced system complexity via basis rotation.

Explored dynamics under various initial conditions.

Abstract

Laser-induced-continuum-structure(LICS) allows for coherent control techniques to be applied in a Raman type system with intermediate continuum state. To this end the standard LICS problem treats two bound states coupled to one or more continua states. In this paper we discuss the simplest non-trivial multilevel generalization of LICS coupling two bound levels, each composed of two degenerate states through a common continuum state. We reduce the complexity of the effective system of bound states by switching to a rotated basis in which different sub-systems of lower dimension evolve independently. We derive a trapping condition and explore the dynamics of the sub-systems under different initial conditions.