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从理论上分析了偏振光束与双折射晶体粒子的相互作用过程,讨论了由于光束自旋角动量向晶体粒子的传递所导致的光致旋转效应的原理,通过MATLAB仿真分析,研究了粒子的旋转频率随激光功率的变化关系,得出粒子转动频率与激光功率成正比。利用光镊装置,采用波长为632.8 nm的He-Ne激光器,在不同的激光功率下实现对不同半径双折射粒子的旋转,测量了光致旋转的转动频率,最高转速可达5 r/s,并得出了不同粒子的旋转频率随激光功率的变化关系,实验结果和理论分析基本一致。分析了产生误差的原因,其中载波片底面的摩擦影响最大。
The interaction between polarized beam and birefringent crystal particles is theoretically analyzed. The principle of photo-rotation due to the transfer of beam angular momentum to crystal particles is discussed. By means of MATLAB simulation analysis, the rotation of the particles The relationship between the frequency and the laser power changes, the particle rotation frequency is proportional to the laser power. Using optical tweezers, the He-Ne laser with a wavelength of 632.8 nm was used to rotate the birefringent particles with different radius under different laser powers. The rotational frequency of phototransmission was measured with a maximum speed of 5 r / s. The relationship between the rotation frequency of different particles and the laser power was obtained. The experimental results are basically consistent with the theoretical analysis. The reason for the error is analyzed, in which the friction of the bottom of the carrier plate has the greatest influence.