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Efficient frequency conversion for cubic harmonic generation at 266 nm in centrosymmetric α-BBO crystal

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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 χ(3) 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 π bond as the nonlinear media during the frequency conversion process. An unprecedented cubic harmonic energy 37.6 μJ (average power 37.6mW, conversion efficiency 2.5%) at 266 nm was generated in α-BBO crystal (not the β-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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