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液晶空间光调制器产生可调三光学势阱*
Generation of the controllable triple-well optical trap by liquid-crystal spatial light modulator*
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摘要: 提出了产生三光学势阱的新方案，在该方案中用液晶空间光调制器制作相位型闪耀光栅，单色相干光照明，产生按等边三角形分布的三个光学势阱，三个光阱光强大小分布相同，调节空间光调制器的相位分布，可以改变光阱的相对位置，实现三光阱到单个光阱、两光阱合并为一个光阱等演变及其反向演变，调节过程简单、方便。根据现有空间光调制器性能和尺寸，模拟设计光栅，计算三光阱的光强分布和调控过程中光强的变化，结果表明：用一般功率的激光照明，能够得到具有较大峰值光强和较高光强梯度的可调三光阱，在原子和分子光学实验研究中有多种重要的应用。Abstract: A new scheme of generating the controllable triple-well optical trap is proposed, in which a liquid-crystal spatial light modulator (SLM) is used to fabricate the phase-type blazed grating and be illuminated with coherent monochromatic light. Three optical wells, each of which has the same intensity distribution, can be formed with relative position of the distribution of an equilateral triangle. The relative positions of the optical wells can be changed by simply and conveniently adjusting the phase distribution of the SLM to realize the evolution and reverse evolution from triple or dual wells to single well. The phase grating is designed by simulation according to the technical parameters of the SLM, and illuminated by the laser with ordinary power. The intensity distributions and intensity changes in the adjustment process for the triple wells are calculated. Results show that the controllable triple-well optical trap with very high peak value of intensity and intensity gradient can be obtained. It has many important applications in the experimental study of atomic and molecular optics.
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