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像差会影响光镊对粒子的捕获效果.全息阵列光镊中,像差不仅来自光学元件,由特定算法设计的光阱相位片也会在光路中引入像差.本文通过液晶空间光调制器加载泽尼克多项式相位图,对全息阵列光镊中由光栅透镜组型算法引起的像差进行校正.结果显示:利用三阶泽尼克多项式可有效消除光路中由光栅透镜组型算法引起的慧差,使得捕获2μm聚苯乙烯小球的阵列光阱刚度提高了约40%;对比不同项的像差校正结果发现,全息阵列光镊中由算法引起的慧差与光学元件引起的像差一样,也会对阵列光阱的捕获效果产生较大影响;同时根据一阶像差校正结果可得光栅透镜组型算法对于—阶泽尼克像差具有鲁棒性.实验结果表明,对全息阵列光镊中由算法引起的像差进行校正,对于提高光阱的捕获效果和深化对算法特性的认识都具有重要意义.
Aberration will affect the optical tweezers on the capture effect of the particles.In holographic optical tweezers, the aberration is not only from the optical components, the optical trap phase plate designed by a specific algorithm will also introduce aberrations in the optical path.Through the liquid crystal spatial light modulator The phase diagram of Zernike polynomial is loaded to correct the aberration caused by the grating lens type algorithm in the holographic array optical tweezers.The results show that the third order Zernike polynomial can effectively eliminate the coma caused by the grating lens type algorithm in the optical path , The optical trap stiffness of the array of 2 μm polystyrene beads is increased by about 40%. Compared with the aberration correction results of different items, the coma aberration caused by the algorithm in the holographic optical tweezers is the same as that caused by the optical element, And will also have a significant impact on the capture effect of the array optical trap.At the same time, according to the first-order aberration correction results, the grating lens type algorithm is robust to the-order Zernike aberration.The experimental results show that the holographic array optical tweezers The aberration caused by the algorithm is corrected, which is of great significance for improving the trapping effect of the optical trap and deepening the understanding of the characteristics of the algorithm.