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Optical second-harmonic response of axially symmetric media under tightly focused excitation: linear versus radial polarization

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Abstract

We compared the optical second-harmonic (SH) response of axially symmetric media excited by tightly focused radially and linearly polarized beams. The simulation performed showed a significant redistribution of energy between the lobes/cones of the SH radiation pattern, depending on the focusing accuracy in the case of a purely surface/interface nonlinearity. This phenomenon is due to the change in the contributions of second-order susceptibility tensor components to SH generation as we demonstrated via a comparison of SH patterns related to different components of the tensor. Replacement of the interface with a nonlinear layer leads to noticeable broadening of SH radiation patterns, which can allow one to distinguish surface nonlinearity from bulk. The model developed is applicable for SH generation by interfaces, films, and poled glasses.

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No data were generated or analyzed in the presented research.

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