Author Affiliations
Abstract
School of Physics, University of Electronic Science and Technology of China, Chengdu 611731, China
Recent advances in the research of vortex beams, structured beams carrying orbital angular momentum (OAM), have revolutionized the applications of light beams, such as advanced optical manipulations, high-capacity optical communications, and super-resolution imaging. Undoubtedly, the methods for generation of a vortex beam and detection of its OAM are of vital importance for the applications of vortex beams. In this review, we first introduce the fundamental concepts of vortex beams briefly and then summarize approaches to generating and detecting the vortex beams separately, from bulky diffractive elements to planar elements. Finally, we make a concise conclusion and outline that is yet to be explored.
vortex beams orbital angular momentum topological charge Chinese Optics Letters
2022, 20(1): 012601
浙江大学 现代光学仪器国家重点实验室,浙江 杭州 310027
在半导体激光端面抽运工作条件下,激光晶体会产生剧烈的热透镜效应。利用532 nm激光作为探测光,观测探测光束通过晶体后的远场图像可以很好地评估热透镜效应程度大小。利用现有的热透镜理论结果建立了光束干涉模型,对远场光环现象进行了解释,并且分析得到了基于远场光环的热焦距计算公式。使用谐振腔稳定性法测量了热透镜焦距,并将测量结果与基于远场光环的热焦距计算结果作对比,验证了光线干涉模型的合理性及计算热焦距公式的准确性。
测量 热透镜 光束干涉模型 热焦距
