论文标题
在双粒力作用下原子速度分布的演变
Evolution of the velocity distribution of atoms under the action of the bichromatic force
论文作者
论文摘要
我们从数值上研究了在双重力作用下原子速度分布的演变。分布宽度的时间依赖性和原子平均加速度的比较揭示了这些数量的相关性。我们表明，基于原子与反传播的双重波的相互作用与原子与$π$ - 珀尔的反传播序列的相互作用之间的类比，对动量扩散系数的估计估计。为了将动量扩散对原子动量分布的演变的影响与时间依赖性多普勒转移的影响分开，我们研究了``重''原子的运动，为此，可以忽略与原子相互作用期间的速度变化。只要原子场相互作用的参数是最佳的，我们表明动量扩散系数与激光辐射的强度成正比。我们使用蒙特卡洛波功能方法进行原子运动的数值模拟。
We study numerically the evolution of the velocity distribution of atoms under the action of the bichromatic force. The comparison of the time dependencies of the distribution width and the average acceleration of atoms reveal the correlation of these quantities. We show that the estimation of the momentum diffusion coefficient on the basis of the analogy between the interaction of atoms with the counter-propagating bichromatic waves and the interaction of atoms with the counter-propagating sequences of the $π$-pulses roughly corresponds to the results of numerical calculations. To separate the influence of the momentum diffusion on the evolution of atomic momentum distribution from the influence of the time-dependent Doppler shift, we study the motion of a ``heavy'' atom, for which the velocity change during the interaction of an atom with the field can be neglected. Provided that the parameters of the atom-field interaction are optimal, we show that the momentum diffusion coefficient is proportional to the intensity of the laser radiation. We used the Monte Carlo wave-function method for the numerical simulation of the atomic motion.
