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基于计算全息法(CGH)以及夫朗禾费衍射近似条件下的衍射理论,设计了获取各阶类贝塞尔空心光束的光栅,通过对光束在径向及其传播方向上的光强分布进行模拟分析,得到光场随着类贝塞尔光束的阶数、传播距离以及径向r的分布规律,得到的空心光束的暗斑尺寸、环状光束宽度和光束半径等表征空心光束特点的参数能更好满足光镊-光钳操作系统要求,验证了利用CGH获取高阶类贝塞尔空心光束的可行性。研究结果为获取高质量的空心光束提供了一种简单、高效的方法。
Based on the computational holography (CGH) and the diffraction theory of the Fraunhofer diffraction approximation, a grating for obtaining the Bezels hollow beams of various classes is designed. By means of the light intensity distribution in the radial direction and the propagation direction of the beams, Simulation results show that the parameters of the hollow beam, such as the order of the beam, the propagation distance and the radial distribution of the beam, the dark spot size of the hollow beam, the width of the annular beam and the radius of the beam Can better meet the optical tweezers - optical clamp operating system requirements, verify the feasibility of using CGH to obtain high-class class of Bessel hollow beams. The results provide a simple and efficient method for obtaining a high quality hollow beam.