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中文摘要：
利用螺旋相位板-轴棱锥系统可以产生高阶贝塞尔光束。基于基尔霍夫衍射积分理论,推导了涡旋光斜入射轴棱锥后的衍射光场表达式。分析了光束斜入射引起的像散对轴棱锥聚焦涡旋光产生高阶贝塞尔光束的影响,提出了一种用于检测拓扑电荷数的简单可行的方案。结果表明当轴棱锥出现较小角度的偏转时,所产生的高阶贝塞尔光束出现中心亮环椭圆化;随着偏转角的增加,中心亮环椭圆率增大,并伴有暗核分裂的现象;继续增大偏转角,将发生由内至外的亮环破裂现象,最终形成具有点阵列结构的焦散光束。设计实验对上述结论进行验证,理论分析、数值模拟与实验结果基本吻合。
英文摘要：
High order Bessel beam can be generated by using spiral phase plate-axicon system.Based on Kirchhoff diffraction integral theory,the expression of diffraction light field after the axicon illuminated by an oblique vortex beam is derived.The influence of astigmatism introduced by oblique illumination of light on high order Bessel beam generated by axicon fucusing vortex beams is analyzed.A simple and feasible scheme for detecting topological charge number is proposed.Results show that when the deflection angle of axicon is small,the center bright ring of high order Bessel beam becomes elliptical.The ellipticity of center bright ring increases with the increasing of reflection angle,and the phenomenon of dark core splitting can be found.With the continuous increasing of the reflection angle,the bright ring will split one by one from inside to outside,and ultimately it will evolve into caustics beam with point array structure.Experiments are designed to verify above researches.Experimental results are in good agreement with theoretical analysis and numerical simulation.
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