Abstract

Lithium niobate (LN) thin film has recently emerged as an important platform for nonlinear optical investigations for its large χ⁽²⁾ nonlinear coefficients and ability of light localization. In this Letter, we report the first, to the best of our knowledge, fabrication of LN-on-insulator ridge waveguides with generalized quasiperiodic poled superlattices using the electric field polarization technique and microfabrication techniques. Benefiting from the abundant reciprocal vectors, we observed efficient second-harmonic and cascaded third-harmonic signals in the same device, with normalized conversion efficiency of 1735% W⁻¹ cm⁻² and 0.41% W⁻² cm⁻⁴, respectively. This work opens a new direction for nonlinear integrated photonics based on LN thin film.

© 2023 Optica Publishing Group

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