Abstract

Third-harmonic generation (THG) has been investigated in the monoclinic $\mathrm{Bi}{\mathrm{B}}_3{\mathrm{O}}_6$. The symmetry and birefringence analysis revealed that there are phase-matching conditions for the direct third-order nonlinear process, where the cascading second-order processes are precluded by the zero effective nonlinearity. The first phase-matched pure ${\chi }^{\left(3\right)}$ THG in a noncentrosymmetric crystal is presented together with the improved Sellmeier and thermo-optic dispersion formulas.

© 2009 Optical Society of America

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