摘要
We demonstrate the full vectorial feature of second-harmonic generation(SHG), i.e., from infrared full Poincaré beams to visible full Poincaré beams, based on two cascading type I phase-matching beta barium borate crystals of orthogonal optical axes. We visualize the structured features of the vectorial SHG wave by using Stokes polarimetry and show the interesting doubling effect of the polarization topological index, i.e., a low-order full Poincaré beam is converted to a high-order one. However, the polarization singularities of both C points and L lines are found to keep invariant during the SHG process. Our scheme could offer a deeper understanding on the interaction of vectorial light fields with media and can be generalized to other nonlinear optical effects.
We demonstrate the full vectorial feature of second-harmonic generation(SHG), i.e., from infrared full Poincarébeams to visible full Poincaré beams, based on two cascading type I phase-matching beta barium borate crystals of orthogonal optical axes. We visualize the structured features of the vectorial SHG wave by using Stokes polarimetry and show the interesting doubling effect of the polarization topological index, i.e., a low-order full Poincaré beam is converted to a high-order one. However, the polarization singularities of both C points and L lines are found to keep invariant during the SHG process. Our scheme could offer a deeper understanding on the interaction of vectorial light fields with media and can be generalized to other nonlinear optical effects.
作者
Li Zhang
Fei Lin
Xiaodong Qiu
Lixiang Chen
张莉;林飞;邱晓东;陈理想(School of Physics and Optoelectronic Engineering,Foshan University,Foshan 528000,China;Department of Physics,Collaborative Innovation Center for Optoelectronic Semiconductors and Efficient Devices,and Jiujiang Research Institute,Xiamen University,Xiamen 361005,China)
基金
supported by the National Natural Science Foundation of China(Nos.91636109,11604050,and 61875242)
the Fundamental Research Funds for the Central Universities at Xiamen University(No.20720190057)
the Natural Science Foundation of Fujian Province of China for Distinguished Young Scientists(No.2015J06002)
the Program for New Century Excellent Talents in University of China(No.NCET-13-0495)
the Science and Technology Planning Project of Guangdong Province(No.2016B010113004)
