Rotational Doppler-effect due to selective excitation of vector-vortex field in optical fiber

V. V. G. Krishna Inavalli, Nirmal K. Viswanathan
Opt. Express. 2011-01-03; 19(2): 448
DOI: 10.1364/OE.19.000448

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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.


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