激光与光电子学进展, 2018, 55 (4): 040501, 网络出版: 2018-09-11
基于轴棱锥的衍射光学元件设计及其光场分析 下载: 1236次
Design of Diffractive Optical Elements Based on Axicon and Its Light Analysis
衍射 衍射轴棱锥 螺旋轴棱锥 轴棱锥阵列 无衍射贝塞尔光束 diffraction diffractive axicon helical axicon axicon array diffraction-free Bessel beam
摘要
衍射光学元件具有小型化、轻量化等优点。依据传统轴棱锥的相位函数,设计了衍射轴棱锥、螺旋轴棱锥和轴棱锥阵列三种衍射光学元件的相位函数;根据角谱衍射理论,建立了平行光入射衍射光学元件的光场分析模型,数值分析了三种衍射光学元件在单色高斯激光束照射下的光场分布特性。模拟结果表明,衍射轴棱锥与传统轴棱锥相比具有相同的光束传输特性,可以在聚焦深度内产生无衍射贝塞尔光束;螺旋轴棱锥产生贝塞尔光束的阶数与拓扑电荷数相同;轴棱锥阵列可以产生无衍射贝塞尔光束阵列。所提衍射光学元件可以应用于激光加工以及成像等领域。
Abstract
The diffractive optical elements have the advantages of miniaturization, lightweight and so on. Based on the phase function of transitional axicon, the phase functions of three kinds of diffractive optical elements such as diffractive axicon, helical axicon and axicon array are designed. By using the theory of angular spectrum diffraction, a light field analysis model for diffractive optical elements irradiated by parallel light is established. The light field distribution characteristics of three kinds of diffractive optical elements under monochromatic Gaussian beam illumination are numerically analyzed. The simulation results show that, the diffractive axicon has the same beam propagation performance compared with the transitional axicon, which can generate diffraction-free Bessel beam in the focal depth. The order of the Bessel beam generated by helical axicon is the same as the number of topological charges. Axicon array can generates an array of diffraction-free Bessel beam. The proposed diffractive optical elements can be used in the fields of laser processing and imaging.
刘晓庆, 薛常喜. 基于轴棱锥的衍射光学元件设计及其光场分析[J]. 激光与光电子学进展, 2018, 55(4): 040501. Xiaoqing Liu, Changxi Xue. Design of Diffractive Optical Elements Based on Axicon and Its Light Analysis[J]. Laser & Optoelectronics Progress, 2018, 55(4): 040501.