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本文提出了用液晶空间光调制器制作复合相位光栅、产生三维光阱阵列的新方案.在本方案中,首先将一维矩形光栅转变为能够产生纵向光阱阵列的环形光栅,再把环形光栅和二维矩形光栅组合成复合光栅.根据现有空间光调制器的技术参数,模拟仿真设计了产生5×5×5光阱阵列的光栅,以普通功率的高斯光波为输入光,正透镜聚焦衍射光,计算输出光强分布,结果表明:在透镜焦点附近获得具有很高峰值光强和光强梯度的三维光阱阵列,囚禁冷原子的光学偶极势达到mK量级,对原子的作用力远大于原子的重力.用大功率激光作为输入光波时,产生的光阱阵列也能用于囚禁Stark减速后的冷分子.
In this paper, a new scheme of fabricating a compound phase grating with a liquid crystal spatial light modulator is proposed, in which a three-dimensional optical trapping array is generated. In this scheme, firstly, a one-dimensional rectangular grating is transformed into a ring grating capable of generating a longitudinal light trapping array, And two-dimensional rectangular grating into a composite grating.According to the technical parameters of the existing spatial light modulator, the simulation produces a grating generating a 5 × 5 × 5 traps array, with the ordinary power Gaussian light wave as the input light, the positive lens focusing The results show that the three-dimensional optical trap array with very high peak light intensity and light intensity gradient is obtained near the focal point of the lens. The optical dipole potential of the impinging cold atoms reaches the mK level and the effect on the atoms The force is far greater than the atom’s gravity, and when a high-power laser is used as the input light wave, the resulting trap array can also be used to trap Stark’s decelerated cold molecules.