Abstract
Direct third-harmonic generation (THG) is a third-order nonlinear process without the restriction to the symmetric characteristic of crystals. It is of great interest for setting up a optical parametric oscillator which can be used in multiphoton quantum correlation. To obtain pure and strong THG, we proposed to elect the centrosymmetric crystal with delocalized bond as the nonlinear media during the frequency conversion process. An unprecedented cubic harmonic energy 37.6 μJ (average power , conversion efficiency ) at 266 nm was generated in -BBO crystal (not the -BBO), indicating direct THG in practical application. These results also demonstrated a succinct and efficient way to generate deep-UV laser and another development direction of nonlinear crystals in UV region.
© 2018 Optical Society of America
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