Rotational frequency shift in cylindrical vector beam due to skew rays in few-mode optical fibers

Nirmal K. Viswanathan; V. V. G. Krishna Inavalli

doi:10.1117/12.841464

8 February 2010 Rotational frequency shift in cylindrical vector beam due to skew rays in few-mode optical fibers

Nirmal K. Viswanathan, V. V. G. Krishna Inavalli

Proceedings Volume 7613, Complex Light and Optical Forces IV; 76130J (2010) https://doi.org/10.1117/12.841464
Event: SPIE OPTO, 2010, San Francisco, California, United States

Abstract

We report here the demonstration of rotational Doppler Effect (RDE) and measurement of rotational frequency shifts (RFS) in single-charge helical-phased cylindrical vector beams directly generated using a two-mode optical fiber. The vector-vortex beam with a shifted vortex core, generated by propagating the Gaussian laser beam as an offset-skew ray selectively excites both the fundamental and first low-order waveguide modes simultaneously in the two-mode optical fiber. Rotation frequency of the output beam around a shifted axis of the beam is measured as a function the analyzer rotation for changing handedness of the input circular polarization to demonstrate RDE in the directly excited cylindrical vector-vortex beams. Even small variations in the input launch conditions were found to dramatically alter the stability of the vortex beams and hence the demonstration of RDE.

Citation Download Citation

Nirmal K. Viswanathan and V. V. G. Krishna Inavalli "Rotational frequency shift in cylindrical vector beam due to skew rays in few-mode optical fibers", Proc. SPIE 7613, Complex Light and Optical Forces IV, 76130J (8 February 2010); https://doi.org/10.1117/12.841464

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