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Jiguang zazhi

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

Wang Lidong, Tongbao Li, Yan Ma, LU Xiang-dong

Published Jan 1, 2010• 0 citations
OpenAlex

Abstract

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.

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Acta Physica Sinica•Jan 1, 2008•5 citations
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.
We have studied laser collimation of a chromium atomic beam using a transverse polarization gradient cooling scheme. We present detailed measurements of the angular distribution of atoms on the beam axis, over a broad range of laser intensities and detunings, including those that produce significant excitation, and observe collimation angles as small as 0.16\ifmmode\pm\else\textpm\fi{}0.01 mrad (50% quantile). We compare our results with existing calculations based on assumptions of steady-state conditions and low excited-state population.
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.