摘要
基于广义惠更斯-菲涅尔原理,构建了柱矢量涡旋光束在径向梯度折射率(gradient-index, GRIN)光纤中传输的解析表达式,并研究了其在径向GRIN光纤中的光谱相干度分布。研究结果表明,柱矢量涡旋光束的光谱相干度沿径向关于光纤纤芯中心对称分布。在光纤焦平面处,随着相干长度σ的降低,光谱相干度分布出现的暗环数逐渐增多,且拓扑荷m越大,光谱相干度分布随相干长度σ的变化越明显。相干长度σ一定且拓扑荷m相同时,不同波长λ的光谱相干度分布规律相同。GRIN系数β影响光谱相干度的周期。
Based on the generalized Huygens-Fresnel principle, the analytical expression of cylindrical vector vortex beams in a radially gradient-index(GRIN) fiber is built, and its distribution of the spectral degree of coherence in a radially GRIN fiber is studied. The results show that the distribution of spectral degree of coherence of cylindrical vector vortex beams is symmetrical along the core of the fiber. At the focal plane of the radially GRIN fiber, with the decrease of coherence length σ, the number of dark rings of the spectral degree of coherence distribution increases gradually, and the change of the spectral degree of coherence distribution is more obvious with the increase of topological charge m.The distribution of the spectral degree of coherence with different wavelengths λ is the same when the coherence length σ is constant and topological charge m is the same.The spectral degree of coherence period changes with refractive index coefficient β.
作者
尹晓金
赵春刚
李晋红
YIN Xiaojin;ZHAO Chungang;LI Jinhong(School of Applied Science,Taiyuan University of Science and Technology,Taiyuan,Shanxi 030024,China)
出处
《光电子．激光》
CAS
CSCD
北大核心
2023年第1期62-67,共6页
Journal of Optoelectronics·Laser
基金
山西省青年科学研究项目(202103021223271)
校级博士科研启动金(20222009)
山西省中央引导地方科技发展资金项目(YDZX20201400001386)资助项目。
作者简介
李晋红(1980-),男,博士,教授,博士生导师,主要从事激光传输与控制、奇点光学和光场调控等方面的研究,E-mail:2021013@tyust.edu.cn。
