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 Technology

Collimation of chromium atomic beam by means of 1-D Doppler laser

Tongbao Li

Published Jan 1, 2009• 0 citations
OpenAlex

Abstract

In order to study how the collimation of chromium ( Cr) atomic by means of 1-D Doppler laser varying with laser power,laser detuning and interaction length after pre-collimation,the correlation between the coUimation and laser parameters was obtained after simulation with the fourth-order Runge-Kutta type algorithm at an adaptive step size. The results show that after precollimated by a slit in 5mm long,600mm far away from the downstream,the best collimation results can be obtained at laser power of 20mW,laser detuning of -0.5.Γ (Γ is the natural line-width of Cr) ,and twice of the minimum interaction zone.

Related papers

Collimation of chromium beam by one-dimensional doppler laser with large collimating slit

Baowu Zhang, Wentao Zhang, Yan Ma +2 more

In this paper, we present experimental study of effects of laser power and interaction length on collimation of chromium atomic beam by one-dimensional Doppler laser with large collimating slit of 5 mm in length, where the fluorescence is treated by Matlab. In addition, calculation by an adaptive step size, fourth-order Runge-Kutta type algorithm is done corresponding to the experiment. Both results show that with fixed interaction length, when the laser power becomes larger, or with fixed laser power, when the interaction length becomes longer, the FWHM of collimated atomic beam becomes smaller, and the peak becomes higher.

Acta Physica Sinica•Jan 1, 2008•5 citations

Experimental measurement study of laser collimation of a chromium beam by Doppler cooling scheme

Wang Lidong, Tongbao Li, Yan Ma +1 more

In this paper,a size detecting system based on Laser induced fluorescence(LIF)is designed to measure the Cr atomic beam divergence of laser collimation by using one-dimensional transverse Doppler cooling scheme.Under the parameters of cooling laser power of 45mW,interaction distance of 24mm and detuning of-0.5Γ,we observe the angular distribution of Cr atoms(50%quantile) on the beam axis is from 1.07±0.10mrad to 0.46±0.10mrad by laser collimation.we also present detailed measurements of collimation angles over different laser powers and compare and analysis our results with numerical calculation based on the semiclassical model.

Jiguang zazhi•Jan 1, 2010•0 citations

Studies on a Laser-collimated Chromium Beam

Tongbao Li

Laser collimation of Cr atomic beam was studied using a transverse Doppler cooling scheme.Collimation occured for a laser detuned to the red side of the 7S3→7P04 transition.Many optimized parameters taken from repetitious experiments and calculations are given,and the misalignment between the probe beam was gotten and the collimation beam will lead to the artificial broadening of detected transverse linewidth.Finally the collimation result is got that the transverse divergence of Cr beam is 0.48 mrad,and the transverse temperature is 265 μK.

ACTA PHOTONICA SINICA•Jan 1, 2007•1 citation

Distribution of chromium atoms in 1-D optical molasses

Xiong Xian-ming

In order to analyze effect of atomic distribution on deposition preparation of nanometer gratings under the action of collimated laser,based on semi-classical theory and Runge-Kutta numerical integration algorithm,the characteristics of dissipative force and the distribution of chromium atoms in 1-D optical molasses was discussed.Then the distribution of chromium atoms was simulated under different laser parameters.The results show that the best distribution appears when the detuning of the laser frequency equals to half of line width of chromium atoms.After the atom beam passing through 1-D optical molasses,its spatial width was suppressed to 0.43 times of that before and the atomic density becomes 1.79 times larger than before,under the condition that laser power equals to 40mW and laser detuning is-2.5MHz.This results show that the atomic distribution can be improved under the action of collimated laser and it's helpful for the deposition preparation of nanometer gratings.

Laser Technology•Jan 1, 2012•0 citations

Laser Collimation of Cr Atoms with 3-D Simulation Analysis

Xianming Xiong, Yanqun Li, Wentao Zhang

Based on two-level atomic theory and Doppler Effect, the laser collimation of Cr atoms with 3-D simulation analysis has been studied in this paper. By analyzing the 3-D force on chromium atom, a theoretical 3-D model is built and the accurate 3-D trajectory of chromium atoms in laser cooling field has been achieved. The final 3-D distribution of atoms with different parameters has also been described.

Journal of Nanoscience and Nanotechnology•Sep 1, 2012•1 citation

Laser Collimation of a Chromium Beam Using Doppler Force

Wentao Zhang, Baohua Zhu, Baowu Zhang +1 more

We report on the collimation of a chromium atomic beam by one-dimensional transverse Doppler laser cooling. Operated on the cycling 7S3→7P(superscript 0 subscript 4) transition at 425.55 nm, the optical molasses laser power was 60 mW, which was detuned 2.5 MHz below the resonant frequency. The angular divergence of the atomic beam was reduced from 4.5 mrad to 0.48 mrad, corresponding to a transverse velocity of ±0.46 m/s, and the relevant transverse temperature is 265 μK.

Chinese Journal of Physics•Feb 1, 2008•1 citation
In order to study how the collimation of chromium ( Cr) atomic by means of 1-D Doppler laser varying with laser power,laser detuning and interaction length after pre-collimation,the correlation between the coUimation and laser parameters was obtained after simulation with the fourth-order Runge-Kutta type algorithm at an adaptive step size. The results show that after precollimated by a slit in 5mm long,600mm far away from the downstream,the best collimation results can be obtained at laser power of 20mW,laser detuning of -0.5.Γ (Γ is the natural line-width of Cr) ,and twice of the minimum interaction zone.
In this paper, we present experimental study of effects of laser power and interaction length on collimation of chromium atomic beam by one-dimensional Doppler laser with large collimating slit of 5 mm in length, where the fluorescence is treated by Matlab. In addition, calculation by an adaptive step size, fourth-order Runge-Kutta type algorithm is done corresponding to the experiment. Both results show that with fixed interaction length, when the laser power becomes larger, or with fixed laser power, when the interaction length becomes longer, the FWHM of collimated atomic beam becomes smaller, and the peak becomes higher.
In this paper,a size detecting system based on Laser induced fluorescence(LIF)is designed to measure the Cr atomic beam divergence of laser collimation by using one-dimensional transverse Doppler cooling scheme.Under the parameters of cooling laser power of 45mW,interaction distance of 24mm and detuning of-0.5Γ,we observe the angular distribution of Cr atoms(50%quantile) on the beam axis is from 1.07±0.10mrad to 0.46±0.10mrad by laser collimation.we also present detailed measurements of collimation angles over different laser powers and compare and analysis our results with numerical calculation based on the semiclassical model.
Laser collimation of Cr atomic beam was studied using a transverse Doppler cooling scheme.Collimation occured for a laser detuned to the red side of the 7S3→7P04 transition.Many optimized parameters taken from repetitious experiments and calculations are given,and the misalignment between the probe beam was gotten and the collimation beam will lead to the artificial broadening of detected transverse linewidth.Finally the collimation result is got that the transverse divergence of Cr beam is 0.48 mrad,and the transverse temperature is 265 μK.
In order to analyze effect of atomic distribution on deposition preparation of nanometer gratings under the action of collimated laser,based on semi-classical theory and Runge-Kutta numerical integration algorithm,the characteristics of dissipative force and the distribution of chromium atoms in 1-D optical molasses was discussed.Then the distribution of chromium atoms was simulated under different laser parameters.The results show that the best distribution appears when the detuning of the laser frequency equals to half of line width of chromium atoms.After the atom beam passing through 1-D optical molasses,its spatial width was suppressed to 0.43 times of that before and the atomic density becomes 1.79 times larger than before,under the condition that laser power equals to 40mW and laser detuning is-2.5MHz.This results show that the atomic distribution can be improved under the action of collimated laser and it's helpful for the deposition preparation of nanometer gratings.