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Оптика и спектроскопия

Динамика предельно коротких импульсов в примесных двухуровневых системах в рамках подхода Глаубера-=SUP=-1-=/SUP=-

М.Б. Белоненко, Н. Н. Конобеева

Published Jan 1, 2022• 0 citations
Publisher

Abstract

In this work, we study the features of the propagation of extremely short optical pulses in a two-level system using the example of a deuterated ferroelectric containing carbon nanotubes. Based on the Heisenberg equation of motion for the average values of the pseudospin operators, as well as the wave equation for the electric field, a numerical simulation of the dynamics of an electromagnetic pulse is carried out. The evolution of the system for various parameters of the problem is demonstrated.

DOI
10.21883/os.2022.12.54091.47-22

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Using the solution of the time Schrödinger equation, the features of the excitation of a bound state of a particle in a one-dimensional rectangular quantum well of small depth by an extremely short light pulse are studied. The case of a shallow well with only one energy level is considered. In this case, the system is excited by an attosecond pulse whose duration is shorter than the characteristic time associated with the energy of the bound state of the particle in the well. It is shown that in this case the population of the bound state and the ionization probability are determined by the ratio of the electric area of the pulse to its atomic measure, which is inversely proportional to the well width. The calculation results showed that unipolar subcycle pulses with nonzero electric area can excite the system faster and more efficiently than bipolar pulses with zero area. The possibility of using unipolar gamma-ray pulses of zeptosecond duration for deuteron excitation is discussed, and numerical estimates of the required duration and electric area of the pulse are given.

Оптика и спектроскопия•Jan 1, 2023•1 citation
In this work, we study the features of the propagation of extremely short optical pulses in a two-level system using the example of a deuterated ferroelectric containing carbon nanotubes. Based on the Heisenberg equation of motion for the average values of the pseudospin operators, as well as the wave equation for the electric field, a numerical simulation of the dynamics of an electromagnetic pulse is carried out. The evolution of the system for various parameters of the problem is demonstrated.
In this work, we study the features of the propagation of extremely short optical pulses in a two-level system using the example of a deuterated ferroelectric containing carbon nanotubes. Based on the Heisenberg equation of motion for the average values of the pseudospin operators, as well as the wave equation for the electric field, a numerical simulation of the dynamics of an electromagnetic pulse is carried out. The evolution of the system for various parameters of the problem is demonstrated. Keywords: extremely short pulse, two-level system, carbon nanotubes.
Abstract A study is performed of the propagation of extremely short optical pulses in a two-level impurity system with carbon nanotubes and anisotropic optical properties. A system of effective equations for the vector potential of the electromagnetic field and pseudospin is derived on the basis of Maxwell’s equations, along with kinetic equations for the average values of pseudospin operators obtained according to Glauber. The effect the system parameters (temperature and vector of polarization’s angle of inclination to the CNT axis) have on the spatial characteristics of a extremely short pulse is analyzed.
The dynamics of an ultrashort optical pulse in an ensemble of two-level systems (in particular, in the presence of defects) is considered in the framework of the microscopic pseudospin formalism without limitation on the pulse power in the approximation of unidirectional propagation. The effective equations for the electric field amplitude and polarization of two-level systems are derived and solved numerically. Quasi-soliton modes of propagation of ultrashort optical pulses are revealed and the dependences on the macroscopic Hamiltonian parameters are analyzed. The effect of various types of defects on the propagation of ultrashort pulses is detected.
Abstract The evolution of ultrashort optical pulses in a photonic crystal consisting of semiconductor carbon nanotubes in an external pump field is considered. The possibility of stable propagation of electromagnetic pulses in pump and damp fields due to a balance between the dissipative forces and the external field is shown. The long-term stability of the ultrashort optical pulse shape in the case of changes in various parameters of the medium, such as the inhomogeneity period of carbon nanotubes in the photonic crystal and the refractive index modulation depth, is demonstrated.
With the coherent interaction of a sequence of extremely short light pulses with a resonant medium (when the duration of the pulses and the delays between them are shorter than the relaxation times of the population difference T1 and polarization T2 of the medium), it is possible to create spatial electromagnetically induced gratings (EMIG) of polarization and population difference in the medium, as well as their ultrafast control. The dynamics of such gratings is of interest in connection with the possibility of ultrafast control over the properties of a medium at times of the order of the pulse duration and their influence on the stability of generation of extremely short pulses in a laser with a short linear cavity. In this paper, based on the numerical solution of the system of Maxwell-Bloch equations, an unusual and interesting possibility of the appearance of narrow and alternating sections in the medium is shown and studied in detail, in which harmonic polarization waves of the medium are formed, propagating in opposite directions relative to neighboring sections. This situation occurs when two extremely short attosecond pulses collide in a two-level resonant medium.
Using the solution of the time Schrödinger equation, the features of the excitation of a bound state of a particle in a one-dimensional rectangular quantum well of small depth by an extremely short light pulse are studied. The case of a shallow well with only one energy level is considered. In this case, the system is excited by an attosecond pulse whose duration is shorter than the characteristic time associated with the energy of the bound state of the particle in the well. It is shown that in this case the population of the bound state and the ionization probability are determined by the ratio of the electric area of the pulse to its atomic measure, which is inversely proportional to the well width. The calculation results showed that unipolar subcycle pulses with nonzero electric area can excite the system faster and more efficiently than bipolar pulses with zero area. The possibility of using unipolar gamma-ray pulses of zeptosecond duration for deuteron excitation is discussed, and numerical estimates of the required duration and electric area of the pulse are given.