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为了研究基片位置对激光会聚铬原子沉积的影响,基于原子的粒子运动,采用数值计算对基片切割会聚激光场不同部位时高斯激光驻波场光学势阱、原子运动轨迹和沉积条纹进行了仿真。研究结果充分显示了基片位置对上述三方面的影响。虽然基片会对激光产生衍射,但是无论衍射存在与否,沉积条纹半峰全宽的最小值和中心峰值的最大值都出现在基片表面和激光中轴线重合的位置。此时,衍射将使条纹中心峰值降为非衍射时的0.96倍,同时,半峰全宽增加至非衍射时的1.03倍。另外,仿真结果显示,不管是否考虑衍射,垂直于激光中轴线方向(y方向)上沉积条纹的中心峰值随y值的增加呈现单调减小的趋势,而条纹半峰全宽随y值的增加呈现单调递增的趋势。
In order to study the effect of substrate position on the deposition of laser-focused chromium atoms, the optical potential, atomic motion trajectories and deposition fringes of Gaussian laser standing wave fields were calculated numerically for different parts of the substrate when cutting and condensing the laser field simulation. The results of the study fully demonstrate the influence of substrate location on the above three aspects. Although the substrate will diffract the laser, the minimum full width at half maximum and the maximum of the center peak of the deposited stripe appear at the coincidence of the substrate surface with the laser axis, regardless of diffraction. In this case, the diffraction reduces the peak center of the fringes to 0.96 times that of the non-diffraction and increases the full width at half maximum to 1.03 times that of the non-diffraction. In addition, the simulation results show that the central peak of depositional stripes perpendicular to the laser axis (y direction) shows a monotone decreasing trend with the increase of y value, regardless of whether the diffraction is considered or not, while the full width at half maximum of the fringes increases with the y value Showing a monotonous trend.