A laser-atom interaction simulator derived from quantum electrodynamics (LASED) is presented, which has been developed in the python programming language. LASED allows a user to calculate the time evolution of a laser-excited atomic system. The model allows for any laser polarization, a Gaussian laser beam profile, a rotation of the reference frame chosen to define the states, and an averaging over the Doppler profile of an atomic beam. Examples of simulations using LASED are presented for excitation of calcium from the $4^{1}S_{0}$ state to the $4^{1}P_{1}$ state, for excitation from the helium $3^{1}D_{2}$ state excited by electron impact to the $10^{1}P_{1}$ state, and for laser excitation of caesium via the ${D}_{2}$ line.A laser-atom interaction simulator derived from quantum electrodynamics (LASED) is presented, which has been developed in the python programming language. LASED allows a user to calculate the time evolution of a laser-excited atomic system. The model allows for any laser polarization, a Gaussian laser beam profile, a rotation of the reference frame chosen to define the states, and an averaging over the Doppler profile of an atomic beam. Examples of simulations using LASED are presented for excitation of calcium from the $4^{1}S_{0}$ state to the $4^{1}P_{1}$ state, for excitation from the helium $3^{1}D_{2}$ state excited by electron impact to the $10^{1}P_{1}$ state, and for laser excitation of caesium via the ${D}_{2}$ line.

arXiv:2203.12535Physical Review AMay 23, 20222 citations

More General States of an Atom in a Laser Field

Marvin H. Mittleman

Springer eBooksJan 1, 19930 citations

Atoms in a laser field

Nikolai L. Manakov, Vitalii D Ovsiannikov, Л. П. Рапопорт

Physics ReportsAug 1, 1986327 citations

Laser Induced Degeneracies

Niels J. Kylstra, O. Latinne, Martin Dörr +5 more

Atomic states may be embedded in the continuum by dressing the atom by an intense laser field. This is often referred to as a laser induced continuum structure (LICS) [1]. This continuum, in general, also has a natural structure due to the doubly excited states, or autoionizing states, of the atom. We have considered the situation in which a complex atom or ion is subjected to an intense laser field such that the LICS states and autoionizing states occur simultaneously. We have have found that, by tuning the frequency and intensity of the field, the states can become degenerate, i.e. have the same position and width.Atomic states may be embedded in the continuum by dressing the atom by an intense laser field. This is often referred to as a laser induced continuum structure (LICS) [1]. This continuum, in general, also has a natural structure due to the doubly excited states, or autoionizing states, of the atom. We have considered the situation in which a complex atom or ion is subjected to an intense laser field such that the LICS states and autoionizing states occur simultaneously. We have have found that, by tuning the frequency and intensity of the field, the states can become degenerate, i.e. have the same position and width.

High Field Interactions and Short Wavelength GenerationJan 1, 19940 citations

The shift of atomic states by laser fields

Joel I. Gersten, Marvin H. Mittleman

An atom or molecule illuminated by a laser has its states modified by the laser. A set of laser-distorted states is defined and the equation for the amplitude of the wavefunction for change of population of these states obtained. The state equation is solved approximately in a novel gauge in the limit where the laser frequency is high, and the utility of this gauge is discussed. The equation is also investigated in the limit of intense fields where the effect of the laser is to make the internal interactions of the atom non-local. The effect of this non-locality is investigated at large distances.An atom or molecule illuminated by a laser has its states modified by the laser. A set of laser-distorted states is defined and the equation for the amplitude of the wavefunction for change of population of these states obtained. The state equation is solved approximately in a novel gauge in the limit where the laser frequency is high, and the utility of this gauge is discussed. The equation is also investigated in the limit of intense fields where the effect of the laser is to make the internal interactions of the atom non-local. The effect of this non-locality is investigated at large distances.

Journal of Physics B Atomic and Molecular PhysicsOct 12, 1976118 citations

An atom in a laser field

Jonathan A. Jones, Dieter Jaksch

Cambridge University Press eBooksJul 19, 20120 citations

4^{1}S_{0}

state to the

4^{1}P_{1}

state, for excitation from the helium

3^{1}D_{2}

state excited by electron impact to the

10^{1}P_{1}

state, and for laser excitation of caesium via the

{D}_{2}

line.