摘要
Measuring the topological charge(TC) of optical vortex beams by the edge-diffraction pattern of a single plate is proposed and demonstrated. The diffraction fringes can keep well discernible in a wide three-dimensional range in this method. The redundant fringes of the diffracted fork-shaped pattern in the near-field can determine the TC value, and the orientation of the fork tells the handedness of the vortex. The plate can be opaque or translucent, and the requirement of the translucent plate for TC measurement is analyzed. Measurement of TCs up to ±40 is experimentally demonstrated by subtracting the upper and lower fringe numbers with respect to the center of the light. The plate is easy to get, and this feasible measurement can bring great convenience and efficiency for researchers.
作者
赵靖寅
晋云霞
孔钒宇
何冬兵
曹红超
郝旺
吴昱博
邵建达
Jingyin Zhao;Yunxia Jin;Fanyu Kong;Dongbing He;Hongchao Cao;Wang Hao;Yubo Wu;Jianda Shao(Thin Film Optics Laboratory,Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Shanghai 201800,China;Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing 100049,China;Key Laboratory of High Power Laser Materials,Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Shanghai 201800,China;CAS Center for Excellence in Ultra-Intense Laser Science,Chinese Academy of Sciences,Shanghai 201800,China;Hangzhou Institute for Advanced Study,University of Chinese Academy of Sciences,Hangzhou 310024,China)
基金
supported by the National Key R&D Program of China (No. 2020YFA0714500)
National Natural Science Foundation of China (Nos. 61875212 and U1831211)
Shanghai Strategic Emerging Industry Development Special Fund (No. 31011442501217020191D3101001)。
