Abstract
We derive wave equations for fifth-harmonic generation in cubic centrosymmetric crystals in direct and indirect processes when an incident electric field propagates along a cubic axis. We elucidate the dependence of fifth-harmonic fields on crystal length and polarization directions of an incident field. We also devise a method to measure elements of a fifth-order nonlinear susceptibility tensor in the transparent regime by measurement of fifth-harmonic intensity from crystals of different lengths.
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