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arXiv · 2511.17327

High system efficiency nonlinear frequency conversion on thin-film lithium niobate

Philipp Lohmann·Daniel Wendland·Francesco Lenzini·Wolfram H. P. Pernice
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Abstract

Integrated photonic platforms can greatly enhance the efficiency of nonlinear frequency conversion processes by tightly confining light on a sub-micron scale. However, this advantage is often reduced by large fiber-to-chip coupling losses which drastically reduce the overall performance. Here we demonstrate a highly efficient thin-film lithium niobate frequency converter based on periodically poled waveguides combined with direct laser written out-of-plane couplers. Including on-chip and fiber-to-chip losses we obtain a conversion efficiency of 152 %/W, thus demonstrating a promising approach for future scalable integrated devices.

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Philipp Lohmann, Daniel Wendland, Francesco Lenzini, Wolfram H. P. Pernice. 2025-11-21. High system efficiency nonlinear frequency conversion on thin-film lithium niobate. https://doi.org/10.1364/ol.561750

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