Inavalli V V G Krishna, Viswanathan Nirmal K
School of Physics, University of Hyderabad, Gachibowli, Hyderabad, India.
Opt Express. 2011 Jan 17;19(2):448-57. doi: 10.1364/OE.19.000448.
Experimental demonstration of rotational Doppler-effect due to direct and simultaneous excitation of orthogonal elliptically-polarized fundamental and vortex modes in a two-mode optical fiber is presented here. The rotation frequency and the trajectory of the zero-intensity point in the two-mode fiber output beam measured as a function of analyzer rotation matches with the S-contour of polarization singularity in the beam, identified via Stokes parameter measurement. The characteristics of the S-contour around the C-point in the output beam is also measured as a function of rotating Dove prism and half-wave plate - Dove prism combination to highlight the role of polarization modifying components on the observed rotational Doppler-effect of vector-vortex beams.
本文展示了在双模光纤中通过直接同时激发正交椭圆偏振基模和涡旋模所产生的旋转多普勒效应的实验演示。作为分析仪旋转函数测量的双模光纤输出光束中零强度点的旋转频率和轨迹，与通过斯托克斯参数测量确定的光束中偏振奇点的S轮廓相匹配。还测量了输出光束中围绕C点的S轮廓的特性，作为旋转道威棱镜和半波片 - 道威棱镜组合的函数，以突出偏振调制组件对观察到的矢量涡旋光束旋转多普勒效应的作用。
