【摘要】 研究高斯光束经螺旋相位板和轴棱锥产生高阶贝塞尔-高斯涡旋光束的离轴传输情况,对于离轴高阶贝塞尔-高斯光束的成因、光强分布操控、光斑定位等实际应用具有一定的理论指导意义.利用菲涅尔衍射积分的卷积算法(Triple fast Fourier transform,T-FFT)对离轴高阶贝塞尔-高斯涡旋光束进行仿真分析,着重研究了螺旋相位板和轴棱锥的错位参数、拓扑荷数以及传输距离等参数对光束带来的影响.分析表明:离轴高阶贝塞尔-高斯光束具有不均匀的光强分布,由于轴棱锥的偏移,光束会整体发生偏移,传输不同距离光强不均匀分布情况不同,不同的拓扑荷数只影响光斑的扩展,螺旋相位板和轴棱锥离轴参量值的多种组合会导致多种不同的光强分布情况,甚至出现暗核偏移.更多还原

【Abstract】 The off-axis transmission of high order Bessel-Gaussian vortex beam produced by spiral phase plate(SPP) and axicon is studied,which can provide reference for the off-axis high order Bessel-Gaussian beams ’formation,intensity distribution control,spot location and other practical applications.On the basis of the theory of diffraction,the transmission of the higher order off-axis Bessel-Gaussian beams is simulated and analyzed by using the triple fast Fourier transform(T-FFT) algorithm.The effects of dislocation parameters,topological charge numbers and transmission distances of SPP and the axicon on the beams are considered during the simulation.The analysis shows that the off-axis higher-order Bessel-Gaussian beams have an uneven light intensity distribution.Due to the shift of the axicon,the beams will be shifted as a whole and the uneven distribution of light intensity at different distances is different.Different topological charge only affects the light spot expansion.Various combinations of the off-axis parametric values for SPP and the axicon will generate different light intensity distributions and even dark core’s shifts.更多还原