Wavelength-accurate and wafer-scale process for nonlinear frequency mixers in thin-film lithium niobate

Conventional pole-before-etch-process for quasi-phase matching in TFLN

The most basic χ⁽²⁾-based optical frequency mixers in TFLN rely on a rib waveguide oriented orthogonal to the material’s crystallographic z-axis (Fig. 1a). For efficient…