Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Laser & Infrared

Neutral Na atoms′ dissipative force in laser Doppler cooling field

Baowu Zhang

Published Jan 1, 2013• 0 citations
OpenAlex

Abstract

The characteristics of neutral Na atoms force is analyzed in laser Doppler cooling field.The characteristics of neutral Na atoms dissipative force is discussed based on Optical Bloch Equation and Density Matrix.The dissipative force′s characteristics is simulated under different laser cooling field parameters.The simulation results show that the lateral cooling can be realized by laser Doppler cooling field.It provides the important theoretical basis for the deposition atomic photoetching technology.

Related papers

Laser cooling mechanism of Chromium atomic beam

Luo Xiao-Shu

The technology of laser-focused atomic deposition can be used to develop the nanostructure transfer standard of length.The atomic laser cooling is a key technique in atom lithography.A theoretical investigation of chromium atomic beam in optical traps is reported in this paper.The Doppler and sub-Doppler laser cooling forces are discussed and some characteristics of these forces are shown based on the semi-classical theory.The simulation results indicate that the atomic beam can be collimated by these laser cooling forces,especially by sub-Doppler laser cooling force and can reach the Doppler limit 120 μk,relative horizontal-speed 13.87 cm/s.

Journal of Guilin University of Electronic Technology•Jan 1, 2007•0 citations

Laser Cooling Mechanisms of Chromium Atomic Beam

Jing Huang, Bao Hua Zhu, Yuan Yuan Wu +1 more

A theoretical investigation of 52Cr atomic beam in optical traps was reported, the Doppler and sub-Doppler laser cooling forces were discussed and some characteristics of these forces were shown based on the semi-classical theory. The simulative results indicate that the atomic beam can be collimated by these laser cooling forces, especially by sub-Doppler laser cooling force.

Advanced materials research•Feb 1, 2011•0 citations

Laser cooling of magnetically trapped neutral atoms

Kristian Helmerson, Alex Martin, David E. Pritchard

We demonstrate laser Doppler cooling of magnetically trapped neutral atoms. Following the application of one-dimensional optical molasses to a sample of magnetically trapped Na atoms, a substantial reduction has been observed in the linewidths of both laser absorption and rf resonance spectra, indicating cooling of the sample to ∼2 mK. A simple model of the one-dimensional Doppler cooling process of the atoms in the trap is presented and compared with the experimentally observed results.

Journal of the Optical Society of America B•Nov 1, 1992•42 citations

Laser cooling limits in fields with a polarisation gradient of atoms with different recoil energies

Anastasia Kirpichnikova, Прудников Олег Николаевич, R. Ya. Ilenkov +2 more

Based on the numerical solution of the quantum kinetic equation for the atomic density matrix, which makes it possible to accurately take into account the recoil effects in the interaction of atoms with field photons, we have studied the limits of laser cooling of atoms using closed optical transitions characterised by different recoil parameters (the ratio of the recoil energy to the natural linewidth). It is shown that for optical transitions with an insufficiently small recoil parameter, the polarisation effects, which lead to the possibility of sub-Doppler laser cooling, lose their efficiency and do not ensure an attainment of the temperature below the Doppler limit. The analysis performed allows one to outline the boundaries of the sub-Doppler theory of laser cooling of atoms.

Quantum Electronics•Sep 28, 2020•12 citations

Laser Cooling and Trapping of Neutral Atoms

Yvan Castin, Jean Dalibard, Claude N. Cohen-Tannoudji

We present a simple review of the basic physical processes allowing one to control, with laser beams, the velocity and the position of neutral atoms. The control of the velocity corresponds to a cooling of atoms, that is, a reduction of the atomic velocity spread around a given value. The control of the position means a trapping of atoms in real space. The best present performances will be given, in terms of the lowest temperatures and the highest densities. The corresponding highest quantum degeneracy will also be estimated. It is imposed by fundamental limits, which will be described briefly. We also give the general trends in this field of research and outline the new directions which look promising for observing quantum statistical effects in laser cooled atomic samples, but which are for the moment restricted by unsolved problems. Introducing the Simple Schemes The radiative forces acting on atoms in a light field can be split into two parts, a reactive one and a dissipative one. The dissipative force (radiation pressure), which basically involves scattering processes, is velocity dependent. We will see that this dependence leads to the Doppler cooling scheme and to the concept of optical molasses, and we will give the corresponding minimal achievable temperature. The dissipative force can be made position dependent, through a gradient of the magnetic field, so that the atoms are also trapped in the so-called magneto-optical trap.

Cambridge University Press eBooks•Apr 6, 1995•6 citations

Optical forces on neutral atoms in the presence of fluctuating laser fields: numerical analysis

Forough Bozorgzadeh, Masoud Yousefi, Mohsen Akbari

Abstract Doppler cooling of 88Sr atoms is studied in the presence of off-resonant red-detuned fluctuating laser fields. Using a semi-classical approach, we show that the relevant physical quantities in the cooling process, such as optical forces, the damping coefficient, Doppler temperature, and atom number in the trap, are strongly affected by the laser amplitude and phase fluctuations. We find that the Doppler cooling limit is higher than the predicted Doppler theory for non-fluctuating lasers. This implies an additional heating mechanism exists due to the laser fluctuations. Furthermore, our numerical analysis shows that the effect of laser power stability on reducing the number of trapped atoms in a magneto-optical trap is more substantial than the effect of laser linewidth.

Communications in Theoretical Physics•Nov 1, 2022•1 citation
The characteristics of neutral Na atoms force is analyzed in laser Doppler cooling field.The characteristics of neutral Na atoms dissipative force is discussed based on Optical Bloch Equation and Density Matrix.The dissipative force′s characteristics is simulated under different laser cooling field parameters.The simulation results show that the lateral cooling can be realized by laser Doppler cooling field.It provides the important theoretical basis for the deposition atomic photoetching technology.
The technology of laser-focused atomic deposition can be used to develop the nanostructure transfer standard of length.The atomic laser cooling is a key technique in atom lithography.A theoretical investigation of chromium atomic beam in optical traps is reported in this paper.The Doppler and sub-Doppler laser cooling forces are discussed and some characteristics of these forces are shown based on the semi-classical theory.The simulation results indicate that the atomic beam can be collimated by these laser cooling forces,especially by sub-Doppler laser cooling force and can reach the Doppler limit 120 μk,relative horizontal-speed 13.87 cm/s.
Based on the numerical solution of the quantum kinetic equation for the atomic density matrix, which makes it possible to accurately take into account the recoil effects in the interaction of atoms with field photons, we have studied the limits of laser cooling of atoms using closed optical transitions characterised by different recoil parameters (the ratio of the recoil energy to the natural linewidth). It is shown that for optical transitions with an insufficiently small recoil parameter, the polarisation effects, which lead to the possibility of sub-Doppler laser cooling, lose their efficiency and do not ensure an attainment of the temperature below the Doppler limit. The analysis performed allows one to outline the boundaries of the sub-Doppler theory of laser cooling of atoms.
We present a simple review of the basic physical processes allowing one to control, with laser beams, the velocity and the position of neutral atoms. The control of the velocity corresponds to a cooling of atoms, that is, a reduction of the atomic velocity spread around a given value. The control of the position means a trapping of atoms in real space. The best present performances will be given, in terms of the lowest temperatures and the highest densities. The corresponding highest quantum degeneracy will also be estimated. It is imposed by fundamental limits, which will be described briefly. We also give the general trends in this field of research and outline the new directions which look promising for observing quantum statistical effects in laser cooled atomic samples, but which are for the moment restricted by unsolved problems. Introducing the Simple Schemes The radiative forces acting on atoms in a light field can be split into two parts, a reactive one and a dissipative one. The dissipative force (radiation pressure), which basically involves scattering processes, is velocity dependent. We will see that this dependence leads to the Doppler cooling scheme and to the concept of optical molasses, and we will give the corresponding minimal achievable temperature. The dissipative force can be made position dependent, through a gradient of the magnetic field, so that the atoms are also trapped in the so-called magneto-optical trap.
Abstract Doppler cooling of 88Sr atoms is studied in the presence of off-resonant red-detuned fluctuating laser fields. Using a semi-classical approach, we show that the relevant physical quantities in the cooling process, such as optical forces, the damping coefficient, Doppler temperature, and atom number in the trap, are strongly affected by the laser amplitude and phase fluctuations. We find that the Doppler cooling limit is higher than the predicted Doppler theory for non-fluctuating lasers. This implies an additional heating mechanism exists due to the laser fluctuations. Furthermore, our numerical analysis shows that the effect of laser power stability on reducing the number of trapped atoms in a magneto-optical trap is more substantial than the effect of laser linewidth.