Rotational Doppler-effect due to selective excitation of vector-vortex field in optical fiber.
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.
School of Physics, University of Hyderabad, Gachibowli, Hyderabad, India.
V V G Krishna
VV
Inavalli
Nirmal K
NK
Viswanathan
D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D008027:Light; D055100:Optical Fibers; D012031:Refractometry / Q000295:instrumentation*; D012399:Rotation; D012542:Scattering, Radiation