Expressions of “fast” and “slow” chameleon dressed states in Autler–Townes spectra of alkali‐metal atoms

Abstract

We have investigated the formation of laser-dressed states in HF components of sodium atoms and their manifestations in Autler-Townes spectra. An explicit procedure is proposed for constructing a specific Morris-Shore wave function basis, within which two-photon excitation schemes are reduced to sets of mutually orthogonal 3-and 2-level excitation sequences, and single uncoupled states. It has been demonstrated that the Morris-Shore basis states correspond to bright and dark states, along with chameleon states introduced in our recent work.Numerical simulations of the Autler-Townes spectra reveal that chameleon states can be further categorized as "fast" or "slow." Our extended classification of dressed states enables more accurate reconstruction of excited state properties in optical methods for atomic media diagnostics.

Competing interactions in strongly driven multi-level systems

“…This is a characteristic of a so-called chameleon state. Such a state is characterized by a decreasing admixture of the probed state with increased coupling, resulting in its disappearance for strong coupling [15,18]. While the model clearly indicates the existence of a chameleon state in our system, the spread in the measured peak heights is too high to confirm it in the experimental data.…”

Spectroscopy of adiabatic dark states under two-photon excitation of sodium atoms

“…The algorithm for obtaining the adiabatic states ψ κ for Lambda-schemes is well known and includes two sequential actions (Vitanov et al, 2017;Shore, 2011;Cinins et al, 2023). (i) First, two new mutually orthogonal wave vectors ψ D and ψ Br are constructed…”

“…Here we employ a numerical algorithm akin to our previous works (Cinins et al, 2022 a;Sydoryk et al, 2008;Bruvelis et al, 2012), i.e. an algorithm based on the split operator technique.…”

“…Bright states, on the contrary, are responsible for the interaction with laser fields and, therefore, participate in the absorption spectra formation, while the associated adiabatic "bright" energies ε (Br) κ experience strong Stark shifts. Chameleon states are endowed with the properties of both dark states, due to the fact that they are not directly involved in the excitation of the atomic system (Kirova et al, 2017), and bright states, since their energies also significantly depend on Rabi frequencies (Cinins et al, 2022 a).…”

“…they turn out to be little susceptible to various dephasing effects that are inherent in excited states due to the processes of radiative decay or strong interatomic interaction (Van Der Waals, dipole-dipole, etc.). For this reason the dark states are widely used in quantum optics for design and subsequent practical implementations of new phenomena or quantum formations (such as electromagneticaly induced transparency (Fleischhauer et al, 2005) or polaritons -a coherent composition of photonic and atomic states (Fleischhauer, Juzeliūnas, 2016), as well as to find highly efficient algorithms for performing quantum operations based on adiabatic passage processes (Rousseaux et al, 2013;Cinins et al, 2022 b). In this context, real-time monitoring and control of the evolution of dark states presents a challenging practical task.…”