拉盖尔–高斯光束在小尺度流场内的 气动光学效应精选.pdfVIP

Modern Physics 现代物理, 2017, 7(6), 273-281 Published Online November 2017 in Hans. /journal/mp /10.12677/mp.2017.76032 Aero-Optical Effect of Laguerre-Gaussian Vortex Beams through a Small-Scale Flow Field 1 1* 1 1 2 1 Qianwen Jiang , Yu Xin , Zhichao Zhou , Qi Zhao , Lingfei Xu , Qibo Zhang 1 School of Electronic and Optical Engineering, Nanjing University of Science and Technology, Nanjing Jiangsu 2 Shanghai Electro-Mechanical Engineering Institute, Shanghai th th th Received: Nov. 9 , 2017; accepted : Nov. 24 , 2017; published: Nov. 30 , 2017 Abstract To learn about the propagation characteristics of Laguerre-Gaussian (LG) vortex beams through the aero-optical environment formed by a micro turret, the parabolic beam equations of complex amplitude were solved by second-order compact differences and Runge-Kutta integration was used for integral along the optical path. Strehl ratio and imaging displacement were calculated at different Mach numbers, different angles of attack, different altitudes and compared among Gaus- sian beam and LG beams with different topological charges. Simulations show that in the same flow field, the LG beam which has more topological charges, the phase of it has better stability and is always better than Gaussian beam, while the amplitude of it has worse stability, only when the radial mode index equals 0 and angular mode index equals 1, the amplitude stability of LG beam is better than Gaussian beam. Keywords Aero-Optics, Propagation Characteristics, Numerical Simulation, Laguerre-Gaussian Vortex Beams, Small-Scale 拉盖尔–高斯光束在小