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We demonstrate type I third harmonic generation enhanced by the tight localization of fs laser light in nonlocal spatial solitons excited in nematic liquid crystals.
We implement a simple and powerful approach to characterize the domain distribution in the bulk of quadratic ferroelectric crystals via far-field second-harmonic spectroscopy. The approach is demonstrated in a lithium tantalate sample with periodic electric field poling and random mark-to-space ratio.
We report ultra low power four-wave mixing in a zero-dispersive and two-photon adsorption free micro-ring resonator. A nonlinear wavelength conversion with an internal efficiency as high as -26 dB has been experimentally achieved over a tuning range of 18 nm. The theoretical model predicts a phase-matching range larger than 100 nm.
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